STEM
HitchForge
Which knot won't choke down when you pull it? Why does a reef knot fail the moment you join a thin rope to a thick one? And why does a trucker's hitch let a 20 kg pull cinch a line to 60 kg? A knot isn't a trick - whether it holds is force you can reason about: the right knot for the job, a steady pull versus a gusting one, the geometry of two ropes, and the pulley hidden in a loop of rope. Predict which holds, then load-test the knots yourself. Tiny, deterministic force science - no internet. Ages 9-14.
#7a5a34 Distributed-narrative cast
Meet the cast
HitchForge's crew ARE a knot for every job - the cast IS the curriculum: each character IS one knot whose behaviour teaches a force. Bowline makes a fixed loop that never chokes down, the rescue loop that stays the size you tied it no matter how hard you pull. Clove grips a post in a heartbeat but rolls loose if the load keeps gusting - quick, not forever, and the lesson that a steady pull is a different test from a jerking one. Reef binds two equal ropes and spills open easily - great for a parcel, but it capsizes the moment the two ropes are unequal, because the geometry decides it. Sheet (the sheet bend) is Reef's answer to unequal ropes: it wraps the thin rope around a bight of the thick one so the thin one grips instead of sliding off. Trucker, the mentor, threads the rope back through itself for a 3-to-1 pull - a pulley made of rope - and reminds the crew to name the JOB before they pick the knot. Painted portraits + storybooks are a tracked follow-on (R-WEB-CLONE-SPAWN-TRACKED); a text-only crew + flat, deterministic on-device force reasoning ship now - nothing leaves the device. Learn real knots with a real grown-up and real rope.
Bowline
The fixed-loop knot that never chokes down - a loop that stays the size you tied it, the right knot when you need a loop that won't tighten under load
Clove
The quick hitch to a post that holds a steady pull but rolls loose under a gusting, jerking load - the lesson that holding a moment ago is not the same as safe
Reef
The knot that binds two EQUAL ropes and capsizes on unequal ones - the geometry of the two ropes, not effort, decides whether a join holds
Sheet
The sheet bend - Reef's fix for unequal ropes, wrapping the thin rope around a bight of the thick one so it grips instead of sliding off
Trucker
(Mentor) The trucker's hitch, a pulley made of rope: a 3-to-1 purchase turns a 20 kg haul into a 60 kg line, and reminds the crew to name the job before the knot
What's inside
Learning goal
Which knot won't choke down when you pull it? Why does a reef knot fail the moment you join a thin rope to a thick one? And why does a trucker's hitch let a 20 kg pull cinch a line to 60 kg? A knot isn't a trick - whether it holds is force you can reason about: the right knot for the job, a steady pull versus a gusting one, the geometry of two ropes, and the pulley hidden in a loop of rope. Predict which holds, then load-test the knots yourself. Tiny, deterministic force science - no internet. Ages 9-14.
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 Trucker — on-device AI, no data leaves the device.
How HitchForge 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
HitchForge 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
HitchForge 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