Academics
RatingForge
Build a rating system and watch it converge (and wobble). For teens: give six bots hidden true strengths, play a season, and watch Elo sort them — then change the K-factor and see the trade-off between fast and steady. Computed on-device; nothing leaves your device.
▶ Play it nowBuilt for sittings of about 25 minutes on the screen. That is our design budget, not a measurement.
#4f46e5 Characters who teach
Meet the cast
RatingForge is an older-teen app, so its cast are realistic text case personas (no illustrations). They ask the statistician's questions before you trust a number.
Devi
The tournament statistician — a season is a measurement, not a verdict: one game is an anecdote, a season is data
Rourke
The rating-system designer — every choice (K, draw rule, uncertainty model) is a trade-off; what are we optimising for, and who does it cost?
Priyanka
The expected score — the logistic curve sets the reward, so beating a much stronger player earns nearly the whole K-factor
Imre
Uncertainty — a rating from a few games is a guess, so it should move faster until enough games back it up
What's inside
Learning goal
Build a rating system and watch it converge (and wobble). For teens: give six bots hidden true strengths, play a season, and watch Elo sort them — then change the K-factor and see the trade-off between fast and steady. Computed on-device; nothing leaves your device.
Mentored by Devi — no data leaves the device.
How RatingForge 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
RatingForge 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
RatingForge 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