E6B Flight Computer + W&B vs Crabwise

An E6B flight computer and a complete Weight & Balance, in one app — the two tools a pilot actually reaches for before every flight, without a subscription. Built from the reviews of every other E6B on the store: the calculations they got wrong, the units they wouldn't accept, and the features that got taken away. Free - Time / Speed / Distance - Fuel required, flow, and endurance - Unit converter - distance, speed, pressure, temperature, fuel weight Pro - one purchase, forever - Weight & Balance - add and rename your own stations, save profiles for every aircraft you fly, CG envelope graph, takeoff and landing (after fuel burn) plotted together, %MAC, lb-in or kg-m - Pressure, density, and true (cold-corrected) altitude - CAS to TAS, EAS, Mach and speed of sound - Wind triangle, unknown wind, crosswind and headwind (with gust), true to magnetic to compass heading, off-course correction - Top of descent, required descent and climb rate, glide distance - Holding entry with wind correction, rate and radius of turn - Performance-table interpolation - Cloud base and freezing level - Export your W&B sheet to PDF What sets it apart - Weight & Balance done in full - not removed in an update, not sold as a separate app - Decimals and negative numbers everywhere - 62.07, 30.02, -13, all accepted, on a keypad built for the app so the system keyboard never gets in the way - Real international units - inHg, hPa, mb, mmHg, kg, lb, litres, US and Imperial gallons, metres, feet, degrees C, degrees F, K - shown right next to every value - Your last inputs carry over between calculators, so pressure altitude flows into density altitude flows into TAS - Tap "How was this calculated?" on any result to see the formula and its source - Works 100% offline - in the run-up area, the ramp, or with no signal - Dark mode for night flying, adjustable text size, screen stays awake One-time purchase The free calculators are fully working - never crippled to push the upgrade. One purchase unlocks everything else. No subscription. No ads. No features taken away later. Calculations use the ICAO standard atmosphere and established aviation formulas, and are verified against published handbook examples. This app is a training and planning aid. Use your POH/AFM and official sources for flight decisions.

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.