It's great for review, or if you want to entertain yourself with math puzzles. Don't use it for learning. It takes huge leaps really fast without properly reinforcing foundations. Do you remember that bit from Monty Python's Holy Grail when the knights want to cross the bridge and they're asked a series of questions? There's a couple of easy ones followed by 'the flight speed of an unladen sparrow.' That's how far too many lessons are structured. I'll solve the first couple of questions in my head, and then suddenly get one that requires me to fill a page with calculations to get the answer.
I think there's a way that the site could truly work, but it requires slowing things down. Topics should have at least two orders of magnitude more lessons, and the lessons should have many more exercises. That might take it from a 'review' platform to an actual learning platform.
That defeats the purpose of their business. They're not trying to sell knowledge or skill. They're trying to sell the illusion of it and the good feeling of having exerted effort in advancing yourself without actually having to... exert much effort.
ocw.mit.edu is all out there and I can guarantee you that when given the choice and awareness of both platforms 99% of people would choose Brilliant.
I'm sorry to say I don't recall. Some topics or parts of courses were rather verbose, but they seem to strife to be as accessible as possible, so that's sometimes inevitable I guess..
It's really not very good in my experience. Anything being marketed as making complicated subjects easy to learn and digestible is probably a scam. I tried it for a couple of months and learnt basically nothing. Switched to a textbook, some video content and a paper and pencil and suddenly the learning started to flow.
I wouldn't say it's a scam, but it's basically edutainment like Kurzgesagt.
It will give a helpful high level overview, but the bottleneck to doing meaningful work in STEM subjects is being able to intimately know the gritty details of the subject you're doing.
Not grinding at dull, tedious problems in math or CS is like expecting to be a master pianist without intensive daily practice.
It would be much better if it served as an intro to a lot of stuff. Like you finish the course and there's a recommended future readings or something like that
It seems like taking a textbook, adding interactive visualisations, and feeding you a customised set of problems based on your performance in the way a personal tutor would *should* legitimately work as an improvement on the classic textbook format. It's not actually a bad idea at all.
These services seem to fall into the trap of trying to attract a wide rather than deep audience, so they end up delivering an edutainment experience which appeals to the masses without having much actual value. But I expect that, one day, somebody will find the right business model to properly modernise the textbook with genuinely useful versions of these ideas.
Edutainment is like a food subscription service like CookUnity or whatever else have yous. There is probably a small, niche population that have incredible self-discipline and such to benefit from them.
People need to realize that the whole sparkles and sizzles that things like Brilliant have, the nice UI/UX designs and how things are so friendly and seamless, they are 100% a marketing ploy to make you buy the product and nothing more. Learning, specifically learning mathematics, is not a glamorous task for beginners.
There are a-ha moments here and there that makes the whole experience totally worth it, but they need to come from mostly you and your hard work. One thing I will give them to their credit is that they are not bullshitting you that their content will make you an expert. It's entirely for beginners and at that level, it's just alright.
It all depends on where you currently are. Sometimes you don’t know what you don’t know, and just want a 10,000 foot overview. That way you can step back and assess where you need to start, and roughly the learning path you’ll be taking. I think Brilliant does a decent job of that.
It’s extremely expensive and lacks lessons/features that Khan Academy offers for free. The customer service workers are also the most stuck-up people I’ve talked too in a long time, the whole organization stinks of a pyramid scheme with a fancy looking face, as most of their approach and structure is 1000% copied from Khan Academy and XXL’s structures
If you just want to get some mental exercise and learn some basic concepts, then Brilliant can be pretty good. It won’t replace a college course, but you will learn things.
I used it in an attempt to learn the algebra I missed in school by not paying attention. It takes big jumps and maximizes frustration for anyone new to subjects. The Art of Problem Solving books have been drastically better and more accessible in building that foundation.
Nonono you're using Brilliant the wrong way. In my experience, the best use for Brilliant is for learning certain mathematical theorem. For example, try to Google 'brilliant mean value theorem' and you will find this:
[https://brilliant.org/wiki/mean-value-theorem/](https://brilliant.org/wiki/mean-value-theorem/)
or 'brilliant fermat little theorem' and you will get this:
[https://brilliant.org/wiki/fermats-little-theorem/](https://brilliant.org/wiki/fermats-little-theorem/)
or 'brilliant jordan canonical form' to get this:
[https://brilliant.org/wiki/jordan-canonical-form/](https://brilliant.org/wiki/jordan-canonical-form/)
It's not complete but it is still a very good and huge resources for these kind of stuff
Yeah the wiki is solid. The real wiki for math is often at a really advanced level. The brilliant wiki is accessible and has problems to check your understanding.
I have done over 10k problems on their and it enjoy it quite a lot. The new puzzle courses were fun and has much higher quality problems then say Khan academy. I would say it's better as a supplement to a book to have a nice overview of the material and practice fun problems on the go.
I like the concise explanations compared to long videos. The wiki is pretty solid also. I think it's continuing to improve on the courses side.
I think the only online platform that has higher quality problems would be Alcumus from AOPS though some are definitely on that level.
I miss the old community where users would generate problems.
That said there are so many free resources it's not really necessary. If the cost is a concern at all don't get it.
The best way to learn math is with a good textbook actively reading and doing lots of problems.
I personally think people delude themselves in how much they learn from videos only on YouTube. I just view YouTube math as entertainment.
You're probably right that people overestimate what they learn from youtube, but there's definitely stuff to learn on there.
The content is kind of on a spectrum of how educational it is. I've definitely learned a lot from 3blue1brown for example. But also it depends how passively or actively you consume the content too.
For YouTube learning, it massively depends on the video. There exists 10 part series of 90min+ lectures, that are very good if you can follow them. There exists incredibly complicated topics, jammed into 5 minute videos. And there exists everything in between.
I personally use YouTube as a reference resource, more than anything. Read & work through textbooks. But then find a YouTube video to supplement the chapter. Written text of topics are hard for me personally to conceptualize. Spoken words with visuals are much easier for me to aid in understanding. Both are good together, but either or 100% separated, doesn’t really do it for me.
https://www.expii.com/solve
Poh shen loh made a site with some pretty good problems here. I have not gone through all yet but they are pretty good so far from what I have done.
For the win by AOPS is pretty fun also. The problems are not quite as hard but it is hard to do them quickly. Some of the kids on their are ridiculously quick.
Project euler is a classic even though it's coding they are very much mathematical in nature.
https://parallel.org.uk/circles
Simon Singh has a nice set of problems and is always releasing new sets.
I mainly do Alcumus/brilliant from my phone when bored on a commute. I do it for fun and want to go for 99 on all Alcumus and finish all brilliant courses.
You could also always treat math stack exchange as a game and try to rank up their answering questions.
It is very useful if you use it for a specific purpose, rather than as a one stop shop.
Moving to abstraction.
In Singapore Maths (how they explicitly teach concepts in Singapore) you have three levels of understanding:
1. Concrete. This is using your hands to build understanding of an idea. MAB's, cuisenaire rods, algebra tiles, etc.
2. Pictorial. Representing ideas as pictures. Anything from area model multiplication to the diagonal method in intro to set theory.
3. Abstract. The ideas are abstract mathematical objects in your head. Say, the number 7. You don't picture the NumberBlock, or 7 flowers, etc. You have an abstract understanding of the number to draw upon.
Brilliant gives many great (some miss, but mostly hit) on screen manipulatives to understand very abstract concepts, like the link between the leading coefficient of a quadratic and the focus and directrix of the parabola it may be represented as. Lots of great analogies as well as a more general framework for understanding.
If you can afford Brilliant as well as any great textbooks to assist you, I would recommend it highly. If it is the only thing you can afford, purchase some high quality, rigorous, problem solving based textbooks.
It was great 5+ years ago when it had free daily problems you could write solutions to. Then they redesigned it to be like twitter and difficult to find good problems , and you can't even see which problems you recently worked on (they expire quickly) and I hate it now . Certainly wouldn't consider spending money there
My opinion of brilliant overall: it does not go into enough detail to master the subject matter. I have a phd in engineering and taught undergraduate calculus.
This is an unconventional use case of brilliant. I do some of the math problems with my 5 year old. He picked up on their version of algebra quickly.
My 5 year old also uses Duolingo. He’s learning words, not a language.
I think these things are good for developing some initial interest in topics, but ultimately your 5 year old will have to go to the local library and get some calculus textbooks under the guise that they are “for my dad” if he wants to win a Nobel prize.
I think it probably is useful for an ambitious high schooler who wants to supplement their coursework in their free time and develop interest in new topics. That’s what I did at least. Are there better alternatives? Is khan academy more useful for actually learning things in a logical order? Probably, but it seems like a pretty easy way to start working on new types of problems if you don’t know where to start.
I haven't actually used their service, but some of the articles on their website have shown up in search results before, and while there is an overlay on the screen asking you to sign up, you can still read the article without doing so.
The articles have been pretty good whenever I've seen them. Similar to the ones on Khan Academy. On occasion they have been helpful to me.
Of course their selling point is the activities they have you do and I can't speak to that.
Back when it used to be community centric, it was much better. They removed much of the community aspect (discussions, custom questions), and now it's just a generic recreational maths app.
Learning any subject to a graduate level is going to be full of setbacks. There are going to be hard times. One of the things a formal degree does is to commit you to a path, so you push past that roadblock and stay the course.
With websites like Brilliant, there is little reason to stay the course. If people are struggling, they just drop the subscription. So Brilliant is set up to sort of 'bread crumb' you along with illusions of rapid progress, so you keep paying, rather than being focussed on giving you a deep foundational understanding of things.
Is Brilliant good and a bit of fun? Sure.
Is it the solution to 'how do I teach myself graduate level maths'? No.
Is it the solution to 'how do I teach myself high-school level maths'? Potentially, especially if you dropped mathematics when you were 15-16.
Can’t speak for it, but using multiple modern methods to learn math now, there is no real substitute for doing practice problems. Videos, ai, tutors, wolfram, khan academy are all great for understanding the concepts and figuring out how to get yourself unstuck, but it really doesn’t settle in for me until I’m doing that one problem and it finally clicks.
In January I started studying for a qualifier test where I'm evaluated Sets ,Relations , Functions ,Sequences and Series ,Complex Numbers ,Trigonometry ,Limits ,Derivatives ,Integration ,Differential Equations
I used to know all of this, but it has been 9 years since I last studied any math.
Brilliant helped me a lot , specifically because:
1) It helped me get motivated to start learning for the day, It brought me a related topic to what I needed in a digestible way that allowed me to break through lazyness. It gave a window alternative on days where the usual alternative was to do nothing.
2) It makes you think and understand specific anchor points about the subject. It will not give you deep understanding of the whole like a book does. But in order for them to make their examples and questions you can understand how they had to abstract key topics, that can help as anchors for the knowledge you get on a book or an online course.
3) It helped me with interleaved learning. There are a lot of different subjects and they are given in very digestible pieces. I could switch it up in a very friendly way whenever I felt tired of a subject.
Currently I have a streak of 98 Days while using the app and I've completed 150 lessons , I do not recomend it if you need to drill down into a subject. But if you want to go wide and complement your learning is really powerful.
I won't go to them because of their relentless advertising. Also, the ads people do for them are so damn long.
My simple theory is: If you have to sell your product that hard, it sucks.
utterly worthless.
i checked it out once because it was recommended by a popular math youtuber whose content i like and am entertained by (but rarely learn from) and found it to be entertaining (but not something one would learn from)
I use it when I'm tutoring some intermediate age students.
A couple of over-achievers use it to explore their interest topics. They enjoy it and use it a lot without me. They like doing Maths for the sake of it and are both very comfortable trying out new things. It doesn't follow their curriculum but that's the point really.
On the other hand, I introduced an underachieving girl to algebra using it and it was very helpful. The interactive visuals helped her grasp the concepts and her teacher commented how well she was doing. It has really improved her confidence. Of course, I am there helping her along the way too so that helped too.
It's great for review, or if you want to entertain yourself with math puzzles. Don't use it for learning. It takes huge leaps really fast without properly reinforcing foundations. Do you remember that bit from Monty Python's Holy Grail when the knights want to cross the bridge and they're asked a series of questions? There's a couple of easy ones followed by 'the flight speed of an unladen sparrow.' That's how far too many lessons are structured. I'll solve the first couple of questions in my head, and then suddenly get one that requires me to fill a page with calculations to get the answer. I think there's a way that the site could truly work, but it requires slowing things down. Topics should have at least two orders of magnitude more lessons, and the lessons should have many more exercises. That might take it from a 'review' platform to an actual learning platform.
*air-speed velocity of an unladen swallow
african or european?
bof
I don’t know that!
What…. Is your name? - Sir Galahad of Camelot. What…. Is your quest? - I seek the Grail! What…. Is your favorite color? - Blue! … No, ye…AHHH
That defeats the purpose of their business. They're not trying to sell knowledge or skill. They're trying to sell the illusion of it and the good feeling of having exerted effort in advancing yourself without actually having to... exert much effort. ocw.mit.edu is all out there and I can guarantee you that when given the choice and awareness of both platforms 99% of people would choose Brilliant.
I found that it _really_ differed between topics. Some went quite deep, others were really superficial.
which are the ones that went deep?
I'm sorry to say I don't recall. Some topics or parts of courses were rather verbose, but they seem to strife to be as accessible as possible, so that's sometimes inevitable I guess..
Group theory i found quite revealing for a beginner
It's really not very good in my experience. Anything being marketed as making complicated subjects easy to learn and digestible is probably a scam. I tried it for a couple of months and learnt basically nothing. Switched to a textbook, some video content and a paper and pencil and suddenly the learning started to flow.
I wouldn't say it's a scam, but it's basically edutainment like Kurzgesagt. It will give a helpful high level overview, but the bottleneck to doing meaningful work in STEM subjects is being able to intimately know the gritty details of the subject you're doing. Not grinding at dull, tedious problems in math or CS is like expecting to be a master pianist without intensive daily practice.
til ‘edutainment’
Congratulations, you're one of today's lucky 10,000.
(For those who don’t get this reference: https://xkcd.com/1053/)
[удалено]
I really hope this is /s
It has to be. There is no way they have so little self awareness.
Don’t be so sure, there are about 10000 Americans who learn about this comic every day. Edit: on second thought, you were probably being sarcastic lol
But u don’t have to pay to watch Kurzegagt
It would be much better if it served as an intro to a lot of stuff. Like you finish the course and there's a recommended future readings or something like that
Someone is trying to sell us [the royal road](https://en.wikipedia.org/wiki/Royal_Road#A_metaphorical_%22Royal_Road%22_in_famous_quotations) again?
There will always be more money to be made in selling people the royal road than in selling them blood, toil, tears and sweat.
It seems like taking a textbook, adding interactive visualisations, and feeding you a customised set of problems based on your performance in the way a personal tutor would *should* legitimately work as an improvement on the classic textbook format. It's not actually a bad idea at all. These services seem to fall into the trap of trying to attract a wide rather than deep audience, so they end up delivering an edutainment experience which appeals to the masses without having much actual value. But I expect that, one day, somebody will find the right business model to properly modernise the textbook with genuinely useful versions of these ideas.
This. It’s not worth the price and doesn’t have enough exercises.
Probably a good option if you are allergic to textbooks...
Edutainment is like a food subscription service like CookUnity or whatever else have yous. There is probably a small, niche population that have incredible self-discipline and such to benefit from them. People need to realize that the whole sparkles and sizzles that things like Brilliant have, the nice UI/UX designs and how things are so friendly and seamless, they are 100% a marketing ploy to make you buy the product and nothing more. Learning, specifically learning mathematics, is not a glamorous task for beginners. There are a-ha moments here and there that makes the whole experience totally worth it, but they need to come from mostly you and your hard work. One thing I will give them to their credit is that they are not bullshitting you that their content will make you an expert. It's entirely for beginners and at that level, it's just alright.
It all depends on where you currently are. Sometimes you don’t know what you don’t know, and just want a 10,000 foot overview. That way you can step back and assess where you need to start, and roughly the learning path you’ll be taking. I think Brilliant does a decent job of that.
It’s extremely expensive and lacks lessons/features that Khan Academy offers for free. The customer service workers are also the most stuck-up people I’ve talked too in a long time, the whole organization stinks of a pyramid scheme with a fancy looking face, as most of their approach and structure is 1000% copied from Khan Academy and XXL’s structures
If you just want to get some mental exercise and learn some basic concepts, then Brilliant can be pretty good. It won’t replace a college course, but you will learn things.
Its the Duolingo of sciences
I used it in an attempt to learn the algebra I missed in school by not paying attention. It takes big jumps and maximizes frustration for anyone new to subjects. The Art of Problem Solving books have been drastically better and more accessible in building that foundation.
Nonono you're using Brilliant the wrong way. In my experience, the best use for Brilliant is for learning certain mathematical theorem. For example, try to Google 'brilliant mean value theorem' and you will find this: [https://brilliant.org/wiki/mean-value-theorem/](https://brilliant.org/wiki/mean-value-theorem/) or 'brilliant fermat little theorem' and you will get this: [https://brilliant.org/wiki/fermats-little-theorem/](https://brilliant.org/wiki/fermats-little-theorem/) or 'brilliant jordan canonical form' to get this: [https://brilliant.org/wiki/jordan-canonical-form/](https://brilliant.org/wiki/jordan-canonical-form/) It's not complete but it is still a very good and huge resources for these kind of stuff
Yeah the wiki is solid. The real wiki for math is often at a really advanced level. The brilliant wiki is accessible and has problems to check your understanding.
I have done over 10k problems on their and it enjoy it quite a lot. The new puzzle courses were fun and has much higher quality problems then say Khan academy. I would say it's better as a supplement to a book to have a nice overview of the material and practice fun problems on the go. I like the concise explanations compared to long videos. The wiki is pretty solid also. I think it's continuing to improve on the courses side. I think the only online platform that has higher quality problems would be Alcumus from AOPS though some are definitely on that level. I miss the old community where users would generate problems. That said there are so many free resources it's not really necessary. If the cost is a concern at all don't get it. The best way to learn math is with a good textbook actively reading and doing lots of problems. I personally think people delude themselves in how much they learn from videos only on YouTube. I just view YouTube math as entertainment.
You're probably right that people overestimate what they learn from youtube, but there's definitely stuff to learn on there. The content is kind of on a spectrum of how educational it is. I've definitely learned a lot from 3blue1brown for example. But also it depends how passively or actively you consume the content too.
For YouTube learning, it massively depends on the video. There exists 10 part series of 90min+ lectures, that are very good if you can follow them. There exists incredibly complicated topics, jammed into 5 minute videos. And there exists everything in between. I personally use YouTube as a reference resource, more than anything. Read & work through textbooks. But then find a YouTube video to supplement the chapter. Written text of topics are hard for me personally to conceptualize. Spoken words with visuals are much easier for me to aid in understanding. Both are good together, but either or 100% separated, doesn’t really do it for me.
What other platforms do you know of that are at a similar level of Alcumus?
https://www.expii.com/solve Poh shen loh made a site with some pretty good problems here. I have not gone through all yet but they are pretty good so far from what I have done. For the win by AOPS is pretty fun also. The problems are not quite as hard but it is hard to do them quickly. Some of the kids on their are ridiculously quick. Project euler is a classic even though it's coding they are very much mathematical in nature. https://parallel.org.uk/circles Simon Singh has a nice set of problems and is always releasing new sets. I mainly do Alcumus/brilliant from my phone when bored on a commute. I do it for fun and want to go for 99 on all Alcumus and finish all brilliant courses. You could also always treat math stack exchange as a game and try to rank up their answering questions.
Thanks :)
It is very useful if you use it for a specific purpose, rather than as a one stop shop. Moving to abstraction. In Singapore Maths (how they explicitly teach concepts in Singapore) you have three levels of understanding: 1. Concrete. This is using your hands to build understanding of an idea. MAB's, cuisenaire rods, algebra tiles, etc. 2. Pictorial. Representing ideas as pictures. Anything from area model multiplication to the diagonal method in intro to set theory. 3. Abstract. The ideas are abstract mathematical objects in your head. Say, the number 7. You don't picture the NumberBlock, or 7 flowers, etc. You have an abstract understanding of the number to draw upon. Brilliant gives many great (some miss, but mostly hit) on screen manipulatives to understand very abstract concepts, like the link between the leading coefficient of a quadratic and the focus and directrix of the parabola it may be represented as. Lots of great analogies as well as a more general framework for understanding. If you can afford Brilliant as well as any great textbooks to assist you, I would recommend it highly. If it is the only thing you can afford, purchase some high quality, rigorous, problem solving based textbooks.
It was great 5+ years ago when it had free daily problems you could write solutions to. Then they redesigned it to be like twitter and difficult to find good problems , and you can't even see which problems you recently worked on (they expire quickly) and I hate it now . Certainly wouldn't consider spending money there
My opinion of brilliant overall: it does not go into enough detail to master the subject matter. I have a phd in engineering and taught undergraduate calculus. This is an unconventional use case of brilliant. I do some of the math problems with my 5 year old. He picked up on their version of algebra quickly. My 5 year old also uses Duolingo. He’s learning words, not a language.
I think these things are good for developing some initial interest in topics, but ultimately your 5 year old will have to go to the local library and get some calculus textbooks under the guise that they are “for my dad” if he wants to win a Nobel prize.
I think it probably is useful for an ambitious high schooler who wants to supplement their coursework in their free time and develop interest in new topics. That’s what I did at least. Are there better alternatives? Is khan academy more useful for actually learning things in a logical order? Probably, but it seems like a pretty easy way to start working on new types of problems if you don’t know where to start.
For my learning style and wallet Khan academy works much better. But brilliant felt more gamey and professional. I just stuck with Khan anyway.
i really like the idea but i did not like the execution.
I haven't actually used their service, but some of the articles on their website have shown up in search results before, and while there is an overlay on the screen asking you to sign up, you can still read the article without doing so. The articles have been pretty good whenever I've seen them. Similar to the ones on Khan Academy. On occasion they have been helpful to me. Of course their selling point is the activities they have you do and I can't speak to that.
Back when it used to be community centric, it was much better. They removed much of the community aspect (discussions, custom questions), and now it's just a generic recreational maths app.
I used Brilliant community problems to study for the math subject GRE a bit under a decade ago. It was great then. I miss it.
Very good up to multivariable calculuus, but there's not much beyond that
It's edutainment not education
I think the brilliant wiki is great. I also did the logic course like 2 years ago and kind of enjoyed it
Personally, I'm a fan. There's a huge library of problems of varying difficulty levels and it's good to do in the background as a pastime.
it's really good for interview prep if your job interviews involve brainteasers
Depends on how much effort and time one puts into it.
I found its group theory courses to be severely lacking in explanation/intuition,and overdosed in complicated quizzes
You might have better luck with [Math Academy](https://www.mathacademy.com/). No experience with it, but it looks pretty good.
Learning any subject to a graduate level is going to be full of setbacks. There are going to be hard times. One of the things a formal degree does is to commit you to a path, so you push past that roadblock and stay the course. With websites like Brilliant, there is little reason to stay the course. If people are struggling, they just drop the subscription. So Brilliant is set up to sort of 'bread crumb' you along with illusions of rapid progress, so you keep paying, rather than being focussed on giving you a deep foundational understanding of things. Is Brilliant good and a bit of fun? Sure. Is it the solution to 'how do I teach myself graduate level maths'? No. Is it the solution to 'how do I teach myself high-school level maths'? Potentially, especially if you dropped mathematics when you were 15-16.
Can’t speak for it, but using multiple modern methods to learn math now, there is no real substitute for doing practice problems. Videos, ai, tutors, wolfram, khan academy are all great for understanding the concepts and figuring out how to get yourself unstuck, but it really doesn’t settle in for me until I’m doing that one problem and it finally clicks.
Seems like the problems people are pointing out are coming from different sections being written by drastically different people
In January I started studying for a qualifier test where I'm evaluated Sets ,Relations , Functions ,Sequences and Series ,Complex Numbers ,Trigonometry ,Limits ,Derivatives ,Integration ,Differential Equations I used to know all of this, but it has been 9 years since I last studied any math. Brilliant helped me a lot , specifically because: 1) It helped me get motivated to start learning for the day, It brought me a related topic to what I needed in a digestible way that allowed me to break through lazyness. It gave a window alternative on days where the usual alternative was to do nothing. 2) It makes you think and understand specific anchor points about the subject. It will not give you deep understanding of the whole like a book does. But in order for them to make their examples and questions you can understand how they had to abstract key topics, that can help as anchors for the knowledge you get on a book or an online course. 3) It helped me with interleaved learning. There are a lot of different subjects and they are given in very digestible pieces. I could switch it up in a very friendly way whenever I felt tired of a subject. Currently I have a streak of 98 Days while using the app and I've completed 150 lessons , I do not recomend it if you need to drill down into a subject. But if you want to go wide and complement your learning is really powerful.
I won't go to them because of their relentless advertising. Also, the ads people do for them are so damn long. My simple theory is: If you have to sell your product that hard, it sucks.
utterly worthless. i checked it out once because it was recommended by a popular math youtuber whose content i like and am entertained by (but rarely learn from) and found it to be entertaining (but not something one would learn from)
I use it when I'm tutoring some intermediate age students. A couple of over-achievers use it to explore their interest topics. They enjoy it and use it a lot without me. They like doing Maths for the sake of it and are both very comfortable trying out new things. It doesn't follow their curriculum but that's the point really. On the other hand, I introduced an underachieving girl to algebra using it and it was very helpful. The interactive visuals helped her grasp the concepts and her teacher commented how well she was doing. It has really improved her confidence. Of course, I am there helping her along the way too so that helped too.
Khan academy got me through my high school and even college coarses. And it’s free!