problem-solving
(2)
Brilliant.org
Brilliant.org is an interactive STEM learning platform that teaches math, science, data, and computer science through hands-on problems instead of passive video. Founded in 2012 by Sue Khim, the San Francisco-based company has grown to roughly 10 million learners and operates on a freemium subscription model with 90+ guided courses.
Lumos Labs (Lumosity)
Lumos Labs is the San Francisco company behind Lumosity, the brain-training app that turned cognitive exercises into a daily habit for more than 100 million people. Founded in 2005 by Kunal Sarkar, Michael Scanlon, and David Drescher, Lumosity packages neuropsychology-inspired tasks - memory, attention, processing speed, problem solving, flexibility - into short, gamified workouts. Its database of player performance, the Human Cognition Project, has fueled collaborations with researchers at Stanford, Harvard, Cambridge, and beyond.