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LocusForge
Prove it — a geometry & proof game for ages 15–18. Construct with compass and straightedge, drag to find the invariant, and build a formal justification — congruence, similarity, coordinate geometry, circle theorems, transformations, and trigonometry. A diagram isn't a proof; the givens are.
▶ Play it nowBuilt for sittings of about 25 minutes on the screen. That is our design budget, not a measurement.
#4257b2 Characters who teach
Meet the cast
LocusForge's characters are realistic people, not mascots, and each one stands for a single skill. Adisa sets the challenge and helps your teen reflect.
Pell
Construction / compass-straightedge
Vireo
Congruence & similarity
Cosima
The drag-invariant / conjecture
Renard
Formal proof / justification
Talise
Coordinate geometry
Osgood
Circle theorems
Castell
Transformations & symmetry
Orin
Trigonometry / unit circle
Alba
3D & cross-sections
Adisa
guides reflect-on-approach
What's inside
Learning goal
Prove it — a geometry & proof game for ages 15–18. Construct with compass and straightedge, drag to find the invariant, and build a formal justification — congruence, similarity, coordinate geometry, circle theorems, transformations, and trigonometry. A diagram isn't a proof; the givens are.
Question kits
16 curriculum-aligned question kits, 400 questions in all, mapped to recognized standards.
On-device AI mentor
FoundationModels-powered hints, feedback, and adaptive difficulty — all running locally.
Mentored by Adisa — on-device AI, no data leaves the device.
How LocusForge handles your kid's data
- ✅ All progress, settings, and AI-generated content stays on the device
- ✅ No analytics, no tracking, no third-party SDKs
- ✅ Free — no ads, no in-app purchases
- ✅ No personal information collected from children — in line with COPPA (updated by the 2026 FTC amendments)
- ✅ No chat with strangers — play-together rooms use a short code and preset emotes, never typed messages
LocusForge runs on ForgeKit — the open-source Swift Package Manager framework that powers every Spark & Anvil app. ForgeKit ensures consistent accessibility, COPPA compliance, and design language across the portfolio, so your kid's progress and preferences feel coherent across every app they touch.
Coming to the App Store
LocusForge is in active development. Email us to hear when it ships — no marketing, no spam, just a one-shot launch announcement.
Email me at launch
