Whiz vs Crabwise

Whiz is a digital E6B flight computer for pilots of every level — from your first solo to ATPL. 169 calculations across 22 modules, 100% offline, in one fast, distraction-free app. WHAT YOU CAN COMPUTE • Airspeeds & atmosphere: TAS, CAS/EAS, Mach, density altitude, pressure altitude, ISA deviation • Wind: full wind triangle, heading & ground speed, crosswind/headwind components, WCA • Time-speed-distance, ETE/ETA, and fuel planning with reserves • Weight & Balance with an interactive CG envelope • Descent & climb: top of descent, rate of descent, gradients, the 3:1 rule • Safety tools most calculators skip: engine-out glide ring, V-speeds by weight, and a crosswind GO / NO-GO check that flags the gust against your POH limit • IFR & pro: runway performance, METAR/TAF decode, holding entries, cold-weather altimetry, oxygen, RNAV/RNP, airline-grade W&B, and more • Every aviation unit conversion WHY PILOTS LIKE IT • Works fully offline — perfect for the cockpit with no signal • Simple vs Precise mode: cockpit rules of thumb or the exact ISA/geodesic model • Configurable by jurisdiction (FAA, EASA, ICAO) and by experience level • Save aircraft profiles to prefill W&B and go/no-go • A "How is it calculated?" view that teaches the formula — great for students Whiz is a computation aid. It does not replace your aircraft's POH/AFM, official charts, current regulations, or operator-required calculations. The pilot in command is always responsible for verifying every figure.

Crabwise is an offline E6B flight computer built for student and private pilots: the six calculations you learn on paper, with type large enough to read at a glance. WIND & GROUND SPEED Solve the wind triangle both directions: find your heading and ground speed, or work backward from heading, track, and ground speed to find the wind. PRESSURE & DENSITY ALTITUDE See the classroom rule of thumb and the exact ICAO Doc 7488 answer side by side, so you know how much margin you actually have. TRUE AIRSPEED & MACH The quick 2%-per-1000-ft approximation and the exact compressible calculation, together. FUEL / TIME / DISTANCE Solve for any one of the three from the other two. CROSSWIND Headwind and crosswind components for any runway and wind. CONVERSIONS Seven unit families: distance, speed, altitude, temperature, pressure, weight, volume. CRABWISE PRO, ONE-TIME PURCHASE ($9.99) - Aircraft profiles: save cruise speed, fuel burn, usable fuel, empty weight and arm, and limits for every aircraft you fly. - Leg planner: chain legs from true course to compass heading, with running totals for time and fuel. - Weight & balance: plot your loading against your aircraft's envelope, checked live as you type. - History & export: save any result and export it as text or CSV. Free forever: all six calculators, every unit, every language, extra-large type. No ads, ever. No trial timer, no subscription. For training and planning cross-checks. Always verify against your aircraft flight manual and official sources. Not for primary navigation. No account. No ads. No tracking. Works offline. Available in English, Spanish, and Polish.