ApogeeLog vs Thrustline Rocket Toolkit

Predict your apogee, size your recovery, and log every flight - 100% offline at the launch field. ApogeeLog is the model rocketry field companion: real boost-and-coast physics off a bundled certified-motor database, parachute sizing for a safe descent, and a searchable flight & motor log. No account, no internet, ever. Every apogee carries an honest error band - it's an estimate to plan with, so verify altitude with a certified altimeter. PREDICT YOUR APOGEE - FREE, UNLIMITED - Deterministic boost-and-coast physics - the same ~10-15% band the desktop tools work in - Predicted apogee + max velocity (with Mach) - every result shows a visible +/- error band - Altitude-vs-time and velocity-vs-time charts - see the whole flight, not just one number SIZE YOUR RECOVERY - FREE, UNLIMITED - Solve parachute diameter for a target descent rate - or enter a chute, get the rate - Flat and dome presets, a 3-6 m/s safe-band check, and a wind-drift estimate - Density-altitude refinement from your field elevation and temperature LOG EVERY FLIGHT, PROVE EVERY CERT Your fleet, your motors, your L1/L2/L3 cert history - off the spiral notebook for good. - Predicted vs measured apogee on every flight - the record that actually means something - Live stats: highest and fastest flight, total impulse, cert progress, most-flown rocket - GPS landing, motor inventory, searchable history, CSV import/export EXPORT A CERT PROOF REPORT - One-tap PDF + CSV - rocket and motor spec, altitude curve, recovery plan, log summary - Assumptions and the error band printed on the page, honestly labeled - A self-reported estimate for record-keeping - not a certifying measurement THE CERTIFIED MOTOR DATABASE Searchable, offline, and built on the public NAR/Tripoli/CAR certified lists. - Search by designation, class, or manufacturer - impulse, thrust, burn time, thrust curve - Bundled snapshot works with zero signal; optional refresh keeps it current (Premium) - Every entry attributed and date-stamped, so you always know how current it is BUILT TO LAST, MADE FOR THE FIELD The desktop tools need a laptop; past iOS apps were abandoned. ApogeeLog is native, maintained, and fully on-device - your data never leaves your iPhone. GROUND ALTITUDE TRACKER (an estimate - not an altimeter) Point your phone at apogee for a no-hardware altitude estimate with an uncertainty band. Two-station tracking adds the NAR 10% "track closed" confidence. A practice tool - it does not replace an onboard altimeter. FREE FOREVER - Unlimited apogee prediction (full motor database) and parachute/recovery sizing - Single-station altitude tracker - Up to 3 saved rockets and 10 logged flights PREMIUM SUBSCRIPTION ApogeeLog Premium adds: - Unlimited flight & motor log + your full rocket fleet - The certified motor database, kept up to date - One-page cert proof report (PDF) + CSV export - Two-station altitude tracking and advanced calcs (Barrowman stability, ejection charge, drift, optimal delay, density-altitude) Subscription options: Premium Monthly: $3.99/month Premium Annual: $19.99/year - includes a 7-day free trial Payment will be charged to your Apple ID account at confirmation of purchase. Subscription automatically renews unless canceled at least 24 hours before the end of the current period. Your account will be charged for renewal within 24 hours prior to the end of the current period. You can manage and cancel your subscriptions by going to your App Store account settings after purchase. Terms of Service: https://apogeelog.bulpara.com/terms Privacy Policy: https://apogeelog.bulpara.com/privacy Estimates for planning - verify altitude with a certified altimeter and follow your club RSO and the NAR/Tripoli/CAR safety code. Not affiliated with or endorsed by any motor manufacturer, NAR, Tripoli, CAR, or Apogee Components. Questions? support@apogeelog.bulpara.com

Thrustline Rocket Toolkit is a fully offline design and stability companion built for model rocketry hobbyists — from Estes starter kits to high-power NAR/TRA builds. No live data feeds, no sensors, no gimmicks: just real physics you can trust before every launch. Enter your airframe dimensions, fin geometry, and nose cone type to get an instant Barrowman-equation Center of Pressure calculation. Add component masses and positions to compute your Center of Gravity, then see a clear, color-coded stability diagram in calibers so you know at a glance if your rocket is stable, marginal, or unstable. Predict performance with a numeric drag-based altitude and velocity simulator, using your rocket's mass, motor impulse, and frontal area to chart altitude, velocity, and time-to-apogee. Browse a bundled offline motor reference library spanning A through O impulse classes with thrust-curve charts, or add your own custom motor data. Keep your build organized with a parts and inventory tracker for tubes, fins, nose cones, motors, parachutes, and wadding, complete with low-stock reminders. Attach build photos and notes to each rocket, and update weigh-ins to automatically refresh your stability calculation. Before heading to the pad, run a customizable NAR/TRA-style pre-flight safety checklist covering igniter, recovery, and range-safety steps. Then export a clean, shareable one-page PDF flight card summarizing your design specs, stability margin, and predicted altitude for your range safety officer. Thrustline Rocket Toolkit works entirely offline, with no account, no subscription gimmicks, and no network dependency — just a dependable engineering tool for hobbyists who care about doing it right.