# Crabwise: E6B Flight Computer — Crosswind, weight & balance

> Crosswind, weight & balance (iPhone/iPad app by Pouya Marvasti.)

- Source: https://appshunter.io/ios/app/crabwise-e6b-flight-computer/id6813311167 (this page in markdown: same URL + `.md`)
- Developer: [Pouya Marvasti](https://appshunter.io/developer/6797565160)
- Category: Utilities, Education
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 15.0 · 6 MB
- Languages: American English
- Released: 2026-09-23
- Data updated: 2026-10-01
- User reviews in markdown: https://appshunter.io/ios/app/crabwise-e6b-flight-computer/id6813311167/reviews.md

## What is Crabwise?

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.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Crabwise Pro | $9.99 | one-time |



## Version history (last 3 releases)

### 1.0.2 — 2026-09-25

Now stays upright on iPhone so every screen fits. The leg planner scrolls properly in the Pro preview. Spanish and Polish text now shows proper accents.

### 1.0.1 — 2026-09-24

Clearer screens: calculated results now look different from the boxes you can change. Fixed a display bug when the wind is stronger than your airspeed, plus 13 smaller fixes.

### 1.0 — 2026-09-23

No release notes.

## More apps by Pouya Marvasti

- [Lingo Pairs: Language Game](https://appshunter.io/ios/app/lingo-pairs-language-game/id6797565158)
- [LingoFlyer: Language Game](https://appshunter.io/ios/app/lingoflyer-language-game/id6805122226)
- [Palabrazo: Spanish Word Game](https://appshunter.io/ios/app/palabrazo-spanish-word-game/id6811220066)

All apps by Pouya Marvasti: https://appshunter.io/developer/6797565160

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-01.*