Krosswind Computer is a complete, offline-first flight computer for general aviation pilots — an E6B and CX-3 replacement that keeps working when you have no signal, plus a suite of planning and in-cockpit tools built for real flying.

Everything runs on your device. Enter your aircraft once and every calculation uses its real numbers. No account, no sign-up, and your data never leaves the phone.

FREE, FOREVER — THE FLIGHT COMPUTER
• True airspeed, Mach, density & pressure altitude, ISA deviation
• Wind correction, heading, groundspeed, crosswind & headwind components
• Fuel burn, endurance, range and economy
• Climb/descent rate, top-of-descent, gradient, glide distance
• Time-speed-distance, off-course correction, standard-rate turns
• Holding entries, VDP, lead turns and instrument planning
• Takeoff & landing distance with density altitude, wind, slope and a 50-ft obstacle, across paved, wet, grass, dirt, snow and ice
• Magnetic variation from the exact NOAA world magnetic model
• Every unit conversion: speed, distance, weight, volume, temperature, pressure

ASK — PLAIN-ENGLISH ANSWERS
Type "glide distance at 150 kt from 10,000 ft" or "what's my useful load after 50 gallons" and get the answer instantly, offline. No guessing — the right calculator, with the math shown, written the way it's taught.

ALSO FREE
• METAR & TAF decoder in plain language
• Quick Templates — copy down an ATIS or an IFR clearance, no route needed
• Checklists you can build and tap through
• VFR, IFR, Commercial and ATP reference cards
• Sun & moon times, Zulu/local clocks, timers
• Editable passenger safety briefing
• Red night mode for the cockpit

KROSSWIND PRO — ONE-TIME PURCHASE
No subscription. Buy once, and every future improvement is included.
• Aircraft profiles: V-speeds, fuel system, cruise data, avionics, components
• Weight & balance with your stations, arms and CG envelope, saved loadouts, and a graphical in-limits check
• Routes and a live in-flight nav log — per-leg timing, planned vs actual, fuel and reserve tracking
• Go / No-Go board against the personal minimums you set
• Offline airport & runway database by region, plus nearest-airport and diversion planning
• Crosswind-by-airport: rank every runway against the current wind, best first
• Live weather and winds aloft when you have a signal
• Logbook with currency tracking and ForeFlight CSV import
• Ownership, maintenance, ADs and inspection intervals
• Document vault with expiry reminders and text extraction (OCR)
• Backup, restore and PDF exports

You can open every Pro screen and look around with sample data before you decide.

Built for pilots, by pilots. Android now, with iOS to follow.

IMPORTANT — SAFETY
Krosswind Computer is a planning and computational aid, not a substitute for your aircraft's approved flight manual (POH/AFM), current charts, NOTAMs, official weather briefings, or manufacturer data. All results depend on the data you enter and on simplified models and may contain errors. As pilot in command you are responsible for the safe conduct of every flight and must verify all figures against authoritative sources. See our Terms of Service and Privacy Policy for details.