Precision dope calculator
Dial it. Hold it. Trust it.
A precision-rifle ballistics calculator for iPhone and Apple Watch. Deep enough for ELR and PRS, clear enough for your first range trip. Free with one rifle, forever.
Holdover
Every hold lands on the glass you actually look through. SFP magnification scaling keeps holds true at any power, a DIAL hint appears when the solution runs off the reticle, and the whole course sits on the glass at once.
Range
Aim down your shot line on satellite imagery, pinch until the arrowhead lands on the target, and one tap pushes range, heading, and incline to every tab. Have a laser? Tap the distance and type the number.
Dope table
G1/G7 drag with density-altitude correction, spin drift, Coriolis, and angled fire. Transonic and subsonic flags show where a solution stops being trustworthy. Ladders past 1,000 yards, out to 3,000 for ELR loads.
Tune
Log the clicks that actually put you on steel, or import a chronograph CSV. Trace back-solves velocity or BC so the curve matches reality, and confirmed dope overrides theory right in the table.
Reticle designer
Start from one of seven base types: duplex, mil-dot, ladder, tree, BDC, prism, or red dot. Or clone one of hundreds of factory patterns and make it yours. Custom designs render everywhere, including the watch.
Glassing point to firing line
A bedded muley from the glassing point or every plate on a stage: mark it, and your dope follows you with every step.
Trace on Apple Watch
Dope. The full 10-yard ladder with a hero solution. The Digital Crown dials distance; tap a number to type it.
Targets. The applied course, one stage per row: hold, clicks, bearing, incline. Tap a row and the whole solve jumps to that stage.
Holdover. Your real reticle, edge to edge, with the course dots on the glass.
Rifles. Switch rifle and load without touching the phone.
Wind. The vector dial, a live compass for azimuth, and timed live-GPS windows that stop themselves.
Rifles, loads, and confirmed dope arrive through your own iCloud. Nothing to pair, nothing to sign into.
Local conditions, one tap
Tap Use GPS and Trace pulls the pressure, temperature, and wind at your position, corrects the whole table for density altitude, and turns the forecast wind to your shot heading. No bars at 9,000 feet? It falls back to a standard atmosphere at your GPS altitude and labels it as an estimate. Only a rounded position ever leaves the phone.
| Range | Theory | Actual | Δ |
|---|---|---|---|
| 200 | ▲5 | ▲5 | ✓ |
| 300 | ▲11 | ▲12 | +1 |
| 450 | ▲23 | ▲25 | +2 |
| 600 | ▲36 | ▲36▲39 | trued |
| 800 | ▲58 | ▲58▲63 | trued |
Tune
Enter a chronograph velocity or the clicks that actually put you on target. Trace back-solves so the curve matches what you shoot. Green when theory and reality agree, amber and red when they drift. The confirmed values ride along into Holdover and onto the watch.
One zero, every load
Zero with the supersonic. Trace solves the clicks to each other load in the live atmosphere, so a subsonic is a dial, not a re-zero. Measure the shift on steel once and it overrides the theory, marked ✦.
8.6 Blackout · 190 gr super → 342 gr sub · ▲55
Pricing
Every feature is included: the solver, satellite ranging, courses of fire, live GPS, truing, the reticle designer, and the Apple Watch app. One purchase removes the one-rifle limit. No subscription, ever.
Free
$0
Trace Pro
$14.99 one time
Privacy by design
Rifles, loads, dope, targets, and reticles live on your iPhone and sync through your own private iCloud database. We can’t read it. There is no “us” to read it.
GPS prefills altitude and weather, centers the map, and follows a target while you walk. Every value can be typed instead, and the app is fully functional with location denied.
No cookies, no trackers, no third-party scripts or fonts. What you see is what loaded. Read the full privacy policy.
Requires iOS 17 or later. Apple Watch app requires watchOS 11. Trace is a reference tool. Always confirm your dope at distance.