MPM & full 6-DoF
Modified Point-Mass and a full 6-Degree-of-Freedom rigid-body solver. Choose per shot, or compare both on one chart.
Precision Ballistics Solver
Shoot the math.
Shoot the math.
Trust the dope.
Trajex is a precision exterior-ballistics calculator for rifle shooters and handloaders. Two real solvers, a 1,279-bullet database, live atmospherics, Coriolis and spin drift — on the iPhone in your range bag.
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Built for handloaders who measure twice and shoot once.
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Free
No ads
No login
Local-first
A field instrument, not a toy.
Every feature earns its place. No ads. No subscriptions. No telemetry.
15 major manufacturers
Curated projectile library with G1 and G7 ballistic coefficients where the manufacturer publishes them.
One-tap GPS & weather
Pulls pressure, temperature, humidity and wind from Open-Meteo at your location. Or enter every field by hand.
Computed automatically
From latitude, firing azimuth and bullet spin — no toggles to forget, no separate calculator to consult.
True MOA / MIL graduation
Shows holdover and wind hold for the target distance on a graduated reticle that matches your optic.
Recipes, not duplicates
Loads are rifle-independent recipes linked by cartridge. One load, every rifle chambered for it.
405 cartridges, 401 TDCC sheets
Official C.I.P. dimensional reference for case, chamber and headspace — built in, always at hand.
Your data, your device
Everything lives on your iPhone. Merge-only backup and restore — your records are never silently deleted.
Two solvers. One chart.
Pick the right physics for the shot.
Most apps give you a single black box. Trajex gives you two named, distinct integrators and lets you overlay them. See where simplification ends and full rigid-body behaviour begins.
Engine 01
FAST
Modified Point-Mass
Industry-standard MPM integrator with drag, atmosphere, gravity, Coriolis and spin drift. Tuned for speed — perfect for quick range cards and what-if comparisons in the field.
Engine 02
PRECISE
6-Degree-of-Freedom
Full rigid-body integrator: pitch, yaw, roll and translation in three dimensions. Resolves yaw of repose, gyroscopic precession and crosswind jump the way a flight simulator resolves an aircraft.
What you get
Every number that matters,
Every number that matters,
at every range step.
Drop, windage left and right, remaining velocity, energy and time of flight — computed for the full range band, not just your zero. Read it as a table, or scrub the interactive elevation and windage trajectory chart to find the transition that bites you.
Drop
MOA · MIL · inch
Windage
L / R per range
Remaining V
fps · m/s
Energy
ft·lb · joule
Time of flight
seconds
Chart
Elev · Wind overlay
Download
Bring the math to the line.
Trajex is on the App Store for iPhone. Free. No ads. No login. If it earns its keep in your range bag, leave a tip.
Free · No ads · No login