The offline iOS field companion for model & high-power rocketry. Predict apogee, size your recovery, and log every flight off a bundled certified-motor database — no account, no internet, ever.
Estimates for planning — verify altitude with a certified altimeter. The two calculators are free forever.
The trusted tools need a laptop. ApogeeLog does the prediction, recovery, and logbook jobs right at the pad — fully offline.
Pick a rocket and a motor, get your number before it’s on the pad. Real boost-and-coast physics, max velocity with Mach, altitude & velocity charts — and a visible ± error band on every result.
Solve parachute diameter for a target descent rate, or enter a chute and get the rate. Flat & dome presets, a 3–6 m/s safe-band check, a wind-drift estimate, and density-altitude refinement.
Your fleet, your motors, your L1/L2/L3 cert history — off the spiral notebook. Predicted vs measured apogee on every flight, GPS landing, motor inventory, and searchable history.
Search by designation, class, or manufacturer — impulse, average thrust, burn time, and thrust curve. Bundled snapshot works with zero signal; optional refresh keeps it current.
A one-page record for cert paperwork and club files. One-tap PDF + CSV with the rocket and motor spec, the altitude curve, the recovery plan — and the error band printed, honestly labeled.
Point your phone at apogee for a no-hardware altitude estimate, shown with an uncertainty band. Two-station tracking adds the NAR 10% “track closed” confidence. A practice tool — not an altimeter.
We win on reliability, offline field-use, and the logbook — never on accuracy claims.
OpenRocket and RockSim need a desktop; the old iOS apps rotted or vanished. ApogeeLog is native, maintained, and 100% on-device — it works on a plane, in a field, with no signal at all.
Every apogee carries a visible ± error band — the same ~10–15% the desktop tools work in. Copy says estimate and predict, never measure or guarantee. Verify altitude with a certified altimeter.
No account, no network, nothing to upload. Rockets, motors, flights, and reports live only on your iPhone. The App Privacy label is simple: Data Not Collected.
Three steps, from the bench to the logbook.
Choose from your fleet and the bundled certified-motor database. Set field elevation and temperature for a density-altitude refinement.
Predicted apogee and max velocity with an honest error band, plus altitude & velocity charts. Size your chute for a safe descent in the same flow.
Save the flight with predicted vs measured apogee, track your cert progress, and export a one-page proof report for the record.
The apogee and recovery calculators are free forever, with the full motor database. Upgrade when you want the logbook, ongoing motor data, and the proof report.
Predict, recover, and log every flight at the pad — fully offline, no account. Free to start.
Download on the App StoreApogeeLog provides estimates for planning. Verify altitude with a certified altimeter and follow your club RSO and the NAR/Tripoli/CAR safety code. The Altitude Tracker is a practice-flight estimate, not a replacement for an onboard altimeter. Not affiliated with or endorsed by any motor manufacturer, NAR, Tripoli, CAR, or Apogee Components.