KidIQ (kidiq.io) is a free brain-training playground for kids ages 4 to 12. The project was started and is built by Alex, a 6-year-old kid developer, with help from his family. Alex picks the games, tests every level, and decides what feels fun.
100% free core, no ads aimed at kids, trophies and daily challenges to keep engagement high, a parent dashboard for progress, and multi-language support (English, Spanish, French, German, Russian).