Pilot Math

Master the aviation calculations every pilot needs — without a calculator.
Rules of Thumb trains you to perform real cockpit mental math quickly and accurately. Six game types cover the calculations student pilots and professionals use every day:

Conversions — speeds, weights, fuel units, distances
Crosswind — crosswind component from angle and wind speed
Drift Correction — DCA using speed factor method
True Airspeed — TAS correction for altitude
Distance & Altitude — descent planning, ROD calculations
Pressure Altitude — PA, ISA deviation, density altitude

Four difficulty levels take you from learning with hints to typing your answer under time pressure with tight tolerances — just like a real checkride.
Master Plus mode and Master Plus Challenge are available with a subscription (€5.99/month or €34.99/year). Master Plus Challenge delivers questions via notifications over 10 hours, simulating real in-flight decision pressure.
Free tier includes: Learning mode (20 min/day), Training mode (10 questions/day) and Master mode (5 questions/day).
30 badges reward speed, accuracy, streaks, daily consistency and challenge completion.
Whether you're a student pilot preparing for your PPL, working toward your CPL, or a qualified pilot keeping sharp — Rules of Thumb gives you the mental tools to fly with confidence.
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https://www.apple.com/legal/internet-services/itunes/dev/stdeula/