DragTree vs HowFast

"DragTree" is an app for practicing real-car drag racing. You can measure drag race times in places where timing equipment is unavailable. Times for 60 feet, 330 feet, 660 feet, 1000 feet, and 1/4 mile are measured using GPS. Starts are determined by looking at a Christmas tree displayed on the screen, just like in competitions. Response times are also measured. A front camera switch allows you to operate the start/stop function while wearing gloves. The front camera switch is especially useful when using this app on a motorcycle. Safety is always the first priority. When using on public roads, please obey the law. (How to Use) 1. Secure the iPhone (or GPS-enabled iPad) with DragTree installed to a stable location, such as the dashboard of your vehicle, where the screen is visible. For use on a motorcycle, secure it to the handlebars or fuel tank. 2. Tap the "Start" button on the home screen to display the Christmas tree screen. If you have not yet upgraded, an information dialog will appear. (Covering the front camera with your finger has the same effect as tapping the "Start" button. This is the front camera switch.) 3. Tap the "START/STOP" button on the Christmas tree screen to begin the countdown until the blue light on the Christmas tree lights up. Tapping the "START/STOP" button before the green light lights up will return you to the time before the countdown began. The "START/STOP" button can be controlled with the front camera switch. 4. Once the blue light comes on, do not move the machine until it is time to start moving. After the staging light comes on, the start timing check will begin. 5. When the green light comes on, it is time to start moving. Response time is measured, followed by all other measurements. A negative response time indicates a false start. The home screen will appear at 660 feet. 6. When the measurement is complete, the results will be displayed on the home screen. 7. To view previous results, tap the "＜ Prev" button. 8. You can share the currently displayed result using the "Share" button. (Settings) - On-screen driving lane selection (left, right) - Start method selection (PRO, FULL) - Select the time from staging light to amber light (Random, Fixed) - Set the countdown time until blue light turns on - Front camera on/off switch *Turn off if malfunction occurs in dark environments, etc. - Start sensor sensitivity selection *Can be adjusted if malfunction occurs frequently. (Changes not recommended) (Measurement Items) - 60 feet and 330 feet elapsed time and speed measurement - 660 feet, 1000 feet, and 1/4-mile elapsed time and speed measurement - Response time (RT) - RT+ET at 660 feet and 1/4-mile - 0-100km/h and 0-60mph acceleration time measurement (Notes) - Permission to use location information is required to use this app. - Permission to access the camera is required to use the front camera switch. - 1,000 measurement results are stored in memory. - Memorized measurement results will be deleted if DragTiming is uninstalled. - Cannot be used on iPads without GPS. - Operation may become unstable if the GPS signal or device reception sensitivity is low. - Measurements may not be accurate if the starting acceleration is too slow. - The developer assumes no responsibility for any accident, violation, loss or claims by third parties which may arise from the use of this app. Terms of Use: This application is provided under the Apple Standard End User License Agreement (EULA). https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Know your number before you stage. HowFast predicts your elapsed time using your vehicle's real specs — engine, drivetrain, tires, and the air conditions at your track. Whether you're dialing in for bracket racing or just curious how quick your car really is, HowFast gives you a data-driven starting point that gets smarter every time you run. Predict with confidence HowFast builds your ET prediction from the ground up — horsepower, drivetrain loss, tire grip, shift times, and real-time density altitude correction. The more you run, the more accurate it gets. HowFast learns from your actual timeslips and adjusts future predictions automatically. Built for the track, not the spec sheet! No expensive GPS hardware required. Use your iPhone's built-in GPS for run detection and timing, or connect to a RaceBox or Qstarz external GPS unit for precision timing at up to 25Hz. HowFast automatically detects your run and starts logging — no tapping required. Your logbook, is always with you! Every run is saved with your predicted ET, actual ET, speed, and conditions. Review your history, spot trends, and see how your tune is progressing over the season. Export Every Run in the DynoLog app effortlessly! HowFast captures your ET, trap speed, 60-foot time, and atmospheric data at the strip. DynoLog is where that data becomes a permanent part of your build record — plotted on a performance timeline, correlated to every mod you've made, and exportable as a professional PDF build sheet. After your pass, tap Export to DynoLog or login and the run lands in your build log automatically — no manual entry, no duplicate imports, no data left behind. Upgrade to Pro — one time purchase, yours forever. Unlock the full HowFast experience with a single one-time purchase: OBD-II connectivity— see your RPM, TPS, gear you're in, in real time Multi-run comparison — overlay runs and telemetry to find where you're gaining or losing Unlimited vehicles in your garage CSV export — take your data anywhere HowFast Pro is a one-time purchase. No subscription, no recurring charges. Whether you're a seasoned bracket racer chasing a perfect dial or a weekend warrior seeing what your car can do, HowFast is the smartest co-driver you've never had.