Open Tools
Free tools for the field
Everything we build is open. Games, assessment infrastructure, research instruments, and AI tools — free for educators, researchers, and developers.
PlayPower Games
50+ free K-8 math games
Free educational math games covering half of K-8 topics, available in English and Spanish. Built by Play Power Labs, distributed freely for the field.
Open Assessment Items
34K+ CC-licensed K-12 math items
Creative Commons licensed assessment items with psychometric data, AI generation, LLM evaluation, and 18 interactive math widgets — built on the Learning Commons Knowledge Graph.
SmartPaper
Computer vision for paper-based assessment
Teachers print worksheets, students write by hand, AI scores instantly. Deployed across government schools in Rajasthan, India. UNESCO-recognized.
Item Difficulty Estimator
LLM-powered difficulty estimation for assessment items
Estimate assessment item difficulty using chain-of-thought analysis with bias correction. Supports 9 item types and 28 interactive math widgets across K-8. Based on our AIED 2026 research.
UpGrade
Open-source A/B testing for education
Experimentation platform purpose-built for educational software. Supports multi-armed bandit and factorial designs. Funded by Gates Foundation and Schmidt Futures.
AI Teacher Tools
Lesson planning, worksheets, text leveling
AI-powered tools for teachers: lesson planning, activity planning, worksheet creation, and text leveling. Full K-12 curriculum generation at $25 total cost.
Building something for education?
All our tools are open source or Creative Commons licensed. Fork, extend, integrate — and let us know what you build.