Open Infrastructure
Open Items
Open assessment infrastructure for K-12 education. Built on the Learning Commons Knowledge Graph.
CZI built the Knowledge Graph. Student Achievement Partners built the Coherence Map. We build the tools that make these frameworks actionable.
Most players in AI & education fall into one of three camps: proprietary platforms, pure research, or infrastructure builders. Open Items is the missing fourth camp — applied open tools built on open infrastructure.
Capabilities
What Open Items provides
34K+ CC-Licensed Items
Openly licensed assessment items spanning K-12 mathematics with difficulty estimates, discrimination parameters, and standards alignment data.
Knowledge Graph Integration
Built on the CZI Learning Commons Knowledge Graph — 250K standards, 2K learning components, 273K prerequisite relationships.
LLM Evaluation Pipeline
5-dimension quality scoring (accuracy, grade-appropriateness, pedagogy, validity, completeness). 85% auto-approve rate, 98% mathematical accuracy.
AI Content Generation
Generate standards-aligned items using Gemini 3 Flash. Full K-12 curriculum content at $25-50 total cost.
Adaptive Practice
Elo-rated difficulty calibration with spaced repetition. 9 item types, 18 interactive math widgets.
Open API + SDKs
REST API and embeddable SDKs so other tools can build on the item bank. npm for educational assessment.
Live demos
See it working
Item Types Demo →
Try all 9 item types — interactive, scored, with hints
Widget Gallery →
18 interactive math widgets: ten frames, number lines, fraction bars, and more
Curriculum Browser →
Browse standards frameworks with coverage data and skill trees
Skill Explorer →
Coverage dashboard, learning progressions, prerequisite relationships
Content Generator →
AI item generation with quality evaluation
Adaptive Practice →
Student-facing practice by grade and skill
Open by design
Open Access
All items CC-licensed. All research published openly. No paywalls, no licensing barriers.
Open Source
Full source code on GitHub. Fork it, extend it, build on it. No vendor lock-in.
Open Data
Psychometric parameters, difficulty estimates, alignment data — all published for the field.
Want to build on Open Items?
We're looking for researchers, curriculum developers, and ed-tech builders.