AsphaltTimer vs GTrace

AsphaltTimer measures how fast your vehicle accelerates – using GPS, right on your iPhone. Pick a speed range (0–100, 100–200, 200–250, 200–300 km/h or a custom range), tap Start and go. The timer starts automatically when you pass the lower speed and stops at the upper one. COCKPIT • Motorsport-style speedometer with segment display • Top speed, G-force and distance • Optional countdown before the start • Portrait and landscape • Haptic feedback at start, split times and finish • Spoken announcements for speed marks (with VoiceOver on, VoiceOver handles the announcements) MEASURE • Preset and custom ranges, several ranges in a single run • Braking test with time and braking distance • Optional weather data for each run (Apple Weather) • Altitude correction data is stored with the run • km/h or mph VIDEO • Film your run with the camera – speed and time are burned into the video as an overlay • With or without engine sound RUNS & STATISTICS • Every run with route map, speed curve and charts • Personal bests per range • Compare runs, add names and tags, search • Statistics across all your drives SHARE & EXPORT • Share result cards as images • Share a run with a photo of your car: as Story (9:16), Post (4:5) or square, optionally with the car cut out – processed on your device • Export as text, CSV and GPX DESIGN & USABILITY • New "Redline" design in light and dark • VoiceOver support • German and English IMPORTANT Use AsphaltTimer only on closed courses or private tracks and always obey traffic laws. Never drive distracted and do not let the app distract you. Timing is meant for fun and comparing your runs, not for competitions or record claims. PRIVACY Your runs, videos and settings stay on your device. AsphaltTimer has no account, no tracking and no ads. GPS measurement requires a device with GPS (iPhone). Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://asphalttimer.speichermann.org/en/privacy/

Track day or mountain road, every G you used stays on record. GTrace turns your iPhone into a real G-meter. It draws the lateral and longitudinal G-forces from your cornering, braking and throttle as a live trace, then lets you replay the run against the map, your footage or the graphs. Record video with audio and create shareable videos with G-force traces and readings overlaid on your footage. One-time purchase. No subscription, no in-app purchases. WHILE YOU DRIVE - Live G-G diagram, lateral and longitudinal G shown together - Trailing trace, with peak lateral and longitudinal G held on screen - Jerk shown as a crosshair, so you can see how smoothly you transfer load - Speed readout, switchable between km/h and mph - Audible alert when you exceed your chosen G threshold - Comfort and Sport modes with separate display ranges for street and track - Three display layouts: standard, info + speed, and video preview - Phone holder mode, so a vertically mounted phone still reads longitudinal G correctly MEASUREMENT - Gravity component removed to isolate true vehicle acceleration - 2nd-order Butterworth IIR low-pass filter with adjustable cutoff frequency - Configurable sampling rate - Axis inversion, so mounting orientation doesn't matter AFTER THE RUN - G-G heat map showing which part of the friction circle you actually used, so you can see the balance between cornering, braking and acceleration at a glance - Synced playback: G-G + map, G-G + video, G-G + acceleration graph, or map + graph, at adjustable playback speed - Time-series graphs for longitudinal G, lateral G, longitudinal jerk, lateral jerk and speed - GPS trace drawn on a map, with top and average speed RECORD AND SHARE - Voice recording, synced to the acceleration data for commentary and notes - Video recording with audio, played back with the G-G trace overlaid - Shareable video export: overlay G-force traces and readings on recorded footage. Export the whole clip or a selected range. - Select video recording resolution: 480p, 720p or 1080p - CSV export for spreadsheets or your own analysis tools - Native binary format (.ggx) import and export, for backups and moving data between devices WHO IT'S FOR - Track day, sports driving and time attack enthusiasts - Drivers working on their technique on mountain roads - Anyone chasing smoother, more passenger-friendly load transfer - Motorsport competitors who want their practice data kept - Anyone who wants their car's behaviour in numbers English and Japanese. iPhone only, iOS 15.6 or later. Note: measurements use the iPhone's built-in accelerometer and gyroscope. Mount the phone firmly in the vehicle for accurate readings. Note: GPS trace and speed recording require location permission. Note: this app does not include lap timing.