Kind of a cool system Kind of a cool system. I did not stick with it cause life is too busy. When they charged me and I cancelled just after they were flexible about giving a refund. They only do that once so don't be sneaky!!

This is definitely worth your time! First, this company produces an amazing product. The lessons are broken into easily digestible bits that you can consume at your own pace. The content of these lessons are each important in their own right, and fit together to form the larger lesson seamlessly. Second, when I had any issue at all, they responded immediately, respectfully, and with clear concern for my issue and finding a resolution that I was happy with. The people I have dealt with directly have all been very helpful, friendly, and professional. Thank you, Brilliant.org, for an amazing product, your amazing employees, and simply a very pleasant and enjoyable experience while improving myself and learning something new.

Disappearing classes Although the classes are interesting and the math is (sometimes) well explained, there are also a lot of issues with Brilliant: *Classes disappearing in the middle of doing it. Algebra 2 for example *Classes skimming through essential piece of information, e.g. Introduction to linear Algebra. I'd really recommend a mix of other solutions if you want to further your understanding of mathematics. Khan Academy & 3Brown1Blue (and many other free resources) provide better explanation and have the same level of interactivity.

Refund request Excellent response from Customer Service to my refund request which was processed in a quick and friendly way.

Good for children (i guess) The idea is cute but imho accomplishes nothing. It tries to "gamefy" the learning experience but just muddles the learning in the process. I can see this being a fun way to learn about our world for small children or maybe young teens, but the site is definitely marketed towards all age groups. Just reading the wikipedia article about whatever subject you want to learn will most likely get you a better grasp on the topic than spending money on the premium subscription, which a lot of it is being spend on making 'cute animations' and keeping the app running. I have yet to come across actual exercises which require any deeper skill whatsoever. If you have a small child at home which wants to learn about science and the like in a playful way or if you are an adult and want to feel like you are learning something new on your commute this is probably not something bad. For me though this feels like another attempt to make an app for something which does not need it. Buy a book instead.