Spatial-reasoning practice for iPhone: mental rotation, cube nets, perspective taking, paper folding, and block assembly.
APP STORE
Foldmetry
SPATIAL REASONING
CLIENT OR PRODUCT
Independent iOS product by Sidi Li.
MY ROLE
Independent product builder — iOS app, end to end
THE PROBLEM
People want focused spatial-reasoning practice, but most tools feel like opaque tests rather than clear, interactive training sessions.
CONSTRAINTS
- •Five classic exercise types with generated, not fixed, question banks
- •Offline-first practice with no account, ads, or tracking
- •Free starter path plus Pro (subscription trial or lifetime)
- •Independent education product — no IQ claims or exam affiliation
THE INVESTIGATION
Designed around short sessions: learn each exercise, mix difficulty, track recent progress, and keep training history private on device.
THE STRATEGY
Ship a native SwiftUI training app with clear exercise surfaces, daily mixed sessions, and privacy-first progress storage.
WHAT I BUILT
- •Mental rotation, cube nets, perspective, paper folding, block assembly
- •Generated practice questions for repeatable sessions
- •Daily mixed sessions and on-device progress history
- •Free tier + Pro unlock (annual trial or lifetime)
THE HARD PART
Making 3D spatial tasks feel readable and fair on a phone screen without turning practice into a black-box test.
THE VERDICT
- •Live on the App Store (Foldmetry: Spatial Reasoning)
- •Independent education product owned end to end
- •Private, offline-capable spatial training loop
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