STEM
SplitForge
Enter your own swim/run/bike times (ages 9–14) and learn the middle-school ratio & percent core through them: pace as a unit rate, percent improvement, negative vs positive splits, yards↔metres, and qualifying cuts as inequalities. Five little coaches, each one math move. On-device — no names, no upload, no AI.
#1f7ea8 Distributed-narrative cast
Meet the cast
SplitForge's little coaching crew (ages 9–14): 5 coaches, each EMBODYING one ratio-&-percent move (R-DN-PARITY — the character IS the operation). Mentor = Marlin, the coach who reads the pace clock with you. Illustrated portraits + DN-S chapters are on the way (STORY-PEND).
Split the Stopwatch
mixed-unit subtraction — the take-away between two clocks
Read chapter →
Pace the Penguin
the unit rate — your time shared out over every 100m
Read chapter →
Cut the Standard-Setter
the inequality — your time must be <= the qualifying cut
Read chapter →
Convert the Otter
yards <-> metres — a yard is a little shorter than a metre
Read chapter →
Taper the Tortoise
the season graph — your best, your average, your improvement
Read chapter →
Browse all chapters → · What's distributed-narrative methodology? →
What's inside
Learning goal
Enter your own swim/run/bike times (ages 9–14) and learn the middle-school ratio & percent core through them: pace as a unit rate, percent improvement, negative vs positive splits, yards↔metres, and qualifying cuts as inequalities. Five little coaches, each one math move. On-device — no names, no upload, no AI.
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.
Mentored by Marlin — on-device AI, no data leaves the device.
How SplitForge 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
- ✅ COPPA compliant under the 2026 FTC amendments
- ✅ Parental controls + session limits + content filters built in
SplitForge 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
SplitForge 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