GeoProof review
A free browser collection for exploring geometry theorems through live figures and guided paths.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
GeoProof is a free, browser-based collection of interactive geometry theorem explorers from Knovay. Its 73 explorers cover triangles, circles, angles, quadrilaterals, polygons, transformations, and area formulas. Learners can drag figures and watch geometric relationships update live; constructions are verified to machine precision. Guided topic paths and a practice quiz support self-guided study, making GeoProof a fit for learners who want to investigate how theorems behave rather than only read explanations.
The central feature is manipulation: figures respond as learners change their geometry, making relationships visible while they explore. Topic paths organize the material, search finds explorers by name or topic, and individual pages can be projected, linked, or embedded in non-profit educational contexts. This gives the collection a useful role for independent exploration and classroom demonstrations, though the available material is centered on theorem explorers and a quiz rather than formal proof exercises.
GeoProof runs on the web and requires no installation, plugins, account, or sign-up. It is free for educational use, with no paid plan structure described. The site identifies itself as a work in progress, so it may suit learners comfortable with an evolving resource. Choose it for free, interactive exploration of geometry concepts; look elsewhere if formal proof practice or a more established classroom tool is central to your needs.
GeoProof pros and cons
- Where it wins
- 73 interactive theorem explorers span core geometry topics
- Dragging figures updates relationships live, with machine-precision construction checks
- Free guided learning paths, quizzes, search, and embeddable explorers
- Where it doesn't
- Work in progress, so the collection may change
- No formal proof-exercise functionality
- Embeds are intended for non-profit educational contexts
GeoProof fact sheet, pricing and score →
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