Academics
OrderDojo
Before you trust a number, run three checks. Orders of magnitude: a "100× better" claim is a two-order leap — is that plausible? Dimensions: compute kinetic energy with v instead of v² and the units reveal you got momentum, not energy. Calibration: being 90% sure and wrong costs almost the maximum. Predict the check, then run it on your own claims. All exact, all on your device. Ages 15–18.
▶ Play it nowBuilt for sittings of about 25 minutes on the screen. That is our design budget, not a measurement.
#5551a8 Characters who teach
Meet the cast
OrderDojo is for ages 15–18 — no illustrated cast; the 'characters' are three sanity checks a scientist runs before trusting a number. Orders of magnitude count the powers of ten a claim jumps (a 100× claim is two orders — big enough to double-check). Dimensional analysis tracks length, time, and mass through a formula so a unit error gives itself away (½mv is momentum, not energy). Brier calibration scores the probability you assigned against what happened, so being confident and wrong is punished most. Every value is exact arithmetic computed on-device. Distinct from FermiForge (estimation-decomposition, 9-14): OrderDojo checks claims and calibration, 15-18.
Order of magnitude
The power of ten a quantity sits at; the gap between two quantities is just counting powers of ten
Dimensional analysis
Tracking length, time, and mass through a formula so a unit error is visible before any number is plugged in
The Brier score
(your probability − what happened)² — it punishes confident-and-wrong far more than being unsure
What's inside
Learning goal
Before you trust a number, run three checks. Orders of magnitude: a "100× better" claim is a two-order leap — is that plausible? Dimensions: compute kinetic energy with v instead of v² and the units reveal you got momentum, not energy. Calibration: being 90% sure and wrong costs almost the maximum. Predict the check, then run it on your own claims. All exact, all on your device. Ages 15–18.
How OrderDojo 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