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
Compose from seven base types — duplex, mil-dot, ladder, tree, BDC, prism, red dot — or clone one of hundreds of factory patterns and make it yours. Custom designs render everywhere, including the watch.
Courses of fire
Drop numbered, colored targets on a stage — each solved at its own angle and bearing. Save the course and bring it back next match.
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.
Wind & environment
By the clock it comes from, with full-, ¾-, ½-, and ¼-value readouts. One tap pulls forecast wind rotated to your shot heading. Density altitude from a GPS tap, a typed altitude, or your Kestrel — honestly labeled when it’s an estimate.
| 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 — and the confirmed values ride along into Holdover and onto the watch.
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.