GPS Race Timer vs Air Power

Measure acceleration times such as 0–60 mph, 60–120 mph and 1/4 mile directly with your iPhone — accurately and without extra hardware. The app is designed so it doesn’t need to be operated while driving; you just set everything up beforehand while stationary. Measurements then start automatically — when the target speed is reached or when a start is detected. You can save results locally on your iPhone and, if needed, export them or transfer them to other devices. Preset timers: 60 ft, 1/8 mile, 1/4 mile, 1/2 mile, 1 mile, 0 – 60 mph, 0 – 120 mph, 50 – 75 mph, 60 – 120 mph, 0 – 100 km/h, 0 – 200 km/h, 80 – 120 km/h, 100 – 200 km/h. All timers are, of course, fully adjustable. The free version measures up to two times per run. How to use the app: Check the timer settings on the start screen. If everything looks good, place your iPhone in the car where it has good GPS reception and is held securely, then start the acceleration test. You can adjust the timer configuration in the Settings screen (just tap the relevant timer). Then return to the race screen and follow the previous instruction. Optional PRO version (in-app purchase): 1. Up to four timers in parallel (instead of two) 2. Precise determination of elevation differences 3. Simulation of a Sportsman start and reaction-time measurement 4. No ad banners

Air Power is a density altitude and horsepower dashboard built for tuners and track-day drivers. See the true air your engine is breathing, forecast performance, and keep every location dialed in. Features - Live DA, relative horsepower, correction factor, and air density from your current location or saved tracks - Multi-location library with quick switching and premium unlock for unlimited spots - Hourly forecast timeline plus extended view to plan runs when the air is best - Dashboard gauges, stat grid, and interactive DA chart for clarity in the pits - Widgets for Lock Screen and Home Screen, including multi-location stacks and Live Activity refresh - Baseline horsepower and DA settings to match your Dyno or build - Offline manual input with performance calculator for Dyno and shop work - Unit controls for temp, pressure, altitude, and horsepower displays Why it matters Density altitude moves your horsepower target hour to hour. Air Power brings the math, sensors, and forecast into one industrial-grade view so you can chase the best air and make smarter calls at the track, dyno, or garage. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/