Academics
RedPen
Fifty confident, neat, wrong derivations in algebra, calculus, mechanics, chemistry and statistics. Find the first line that fails, pick the corrected line, and name the kind of failure: algebra slip, wrong principle, unit error or unjustified step. Answers are cheap now; checking is the skill. Every line is checked by an exact engine, and nothing leaves your device.
▶ Play it nowBuilt for sittings of about 25 minutes on the screen. That is our design budget, not a measurement.
#a3262a What's inside
Learning goal
Fifty confident, neat, wrong derivations in algebra, calculus, mechanics, chemistry and statistics. Find the first line that fails, pick the corrected line, and name the kind of failure: algebra slip, wrong principle, unit error or unjustified step. Answers are cheap now; checking is the skill. Every line is checked by an exact engine, and nothing leaves your device.
Question kits
16 curriculum-aligned kits × 25 questions = 400 questions per app, mapped to recognized standards.
On-device AI mentor
FoundationModels-powered hints, feedback, and adaptive difficulty — all running locally.
How RedPen handles your kid's data
- ✅ All progress, settings, and AI-generated content stays on the device
- ✅ No analytics, no tracking, no third-party SDKs
- ✅ No ads, no in-app purchases — you pay once
- ✅ No personal information collected from children — in line with COPPA (updated by the 2026 FTC amendments)
- ✅ Parental controls + session limits + content filters built in
RedPen 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
RedPen 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