# Euclid Lab — Read, Construct, Prove

> Read, Construct, Prove (iPhone/iPad app by Yung-Hsin Shieh.)

- Source: https://appshunter.io/ios/app/euclid-lab/id6801162141 (this page in markdown: same URL + `.md`)
- Developer: [Yung-Hsin Shieh](https://appshunter.io/developer/6794223212)
- Category: Education
- Price: Free
- Age rating: 4+
- Requires: iOS 17.0 · 14 MB
- Languages: American English
- Released: 2026-08-27
- Data updated: 2026-09-10
- User reviews in markdown: https://appshunter.io/ios/app/euclid-lab/id6801162141/reviews.md

## What is Euclid Lab?

Explore the 48 propositions of Book I of Euclid’s Elements through reading, construction and proof practice. Euclid Lab separates proposition reading, straightedge-and-compass work and reasoning so you can focus on one activity at a time.

Arrange supplied proof blocks to connect premises to conclusions. Scored exercises use semantic checks of geometric relationships and logical dependencies, not the appearance of a drawing or AI grading. Progressive hints and complete solutions, shown on request, help when you get stuck.

I.7 currently offers unscored reading, exploration and notes. Freehand notes are also unscored and are not automatically verified as correct proofs.

Foundations and I.1–I.12 are free. I.13–I.24 and I.25–I.48 are separate, one-time in-app purchases. Buying one pack does not unlock the other. No subscription is required.

Learning progress and notes are stored locally on your device. Learner profiles are not Apple Accounts, and no Euclid Lab account registration is required. Restore Purchases restores eligible content access; it does not synchronize learning progress.


## Version history (last 4 releases)

### 1.2.0 — 2026-09-08

Updates: Added Book I propositions I.25–I.48 as a separate one-time purchase.
Changes: Improved proposition reading, proof-block practice and handwritten notes.
Bug Fixes: Fixed proposition text display and long-sentence interactions; improved Restore Purchases feedback.

### 1.1.1 — 2026-09-03

Reorganized each mission into proposition, construction, and explanation tabs to reduce long-page scrolling.
• Added Book I propositions I.13–I.24, available through a one-time purchase.
• Added reorderable proof blocks, progressive hints, and complete solutions shown on request.
• Added an unscored geometry notebook for free-form work and proof notes.
• Improved canvas space, portrait and landscape layouts, point touch targets, replay, and reset.
• Added Settings and About, plus randomized encouragement sounds and completion animations.
• Fixed an I.3 crash on some physical devices, premium-content lock state, and other stability issues.

### 1.1.0 — 2026-08-31

• Added Book I Propositions I.13–I.24 with a one-time unlock and Restore Purchases.
• Reorganized each mission into Proposition, Construction, and Proof tabs to reduce long scrolling.
• Added staged hints, a complete solution, proof-writing practice, and semantic math input.
• Improved the canvas, point touch targets, replay history, reset flow, landscape layout, and point-label placement across all propositions.
• Fixed a physical-device crash that could occur when opening a fresh mission, with additional stability and readability improvements.

### 1.0 — 2026-08-27

No release notes.

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All apps by Yung-Hsin Shieh: https://appshunter.io/developer/6794223212

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-10.*