# QUAD-G ForceMeter Laptimer — 4-wheel load, G and telemetry > GPS lap timer and vehicle dynamics G-force meter using phone sensors. (iPhone/iPad app by SYNSETECH LTD.) - Source: https://appshunter.io/ios/app/quad-g-forcemeter-laptimer/id6792617370 (this page in markdown: same URL + `.md`) - Developer: [SYNSETECH LTD](https://appshunter.io/developer/6792617372) - Category: Sports, Navigation - Price: Free - Age rating: 4+ - Requires: iOS 15.1 · 49 MB - Languages: American English - Released: 2026-08-05 - Data updated: 2026-08-26 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/quad-g-forcemeter-laptimer/id6792617370/reviews.md ## What is QUAD? A GPS lap timer that works anywhere on Earth, and an integrated vehicle-dynamics G-force meter. Using nothing but your phone's sensors and GPS, it times laps and sectors while showing four-wheel weight transfer, G-forces and chassis attitude in real time. No extra sensors, no OBD dongle. ■ GPS lap timer Circuits, of course — but you can set a course anywhere in the world. Long-press the map to place start, finish and sector lines, and every crossing splits a lap and a sector automatically. Best lap, last lap and every sector time stay on the main screen, so you can see where you are finding time while you drive. Closed circuits and open point-to-point courses are both supported, so rally and hill-climb stages work too. Save as many courses as you like, set which direction counts as a crossing, and add as many sectors as you need. With no course set, the LAP button still times from where you stand. ■ One integrated meter Four-wheel load, the G-G diagram, yaw rate and roll/pitch on a single screen, right alongside the lap display. Everything you need while driving, in one place. ■ Four-wheel load monitoring Weight transfer is computed from G-forces and your vehicle specs, then shown at each corner as colour and numbers, so you can see whether you are using all of the tyre. Load falling shifts blue, load building shifts red. Delta/absolute and %/kgf are both switchable. ■ G-G diagram Lateral against longitudinal G, with the trail you actually drove and the envelope of the limit you reached. The envelope is where your car's grip runs out, drawn for you. ■ Understeer and oversteer alerts Measured yaw rate is compared against the theoretical neutral-steer reference to catch sharp yaw-rate changes in the transient, and the app calls them out by voice and colour. The axle that is losing cornering force is boxed, so you can tell instantly which end is going. Tune it with a scene (circuit / winding road) × sensitivity profile. ■ Data logger and viewer Record a session and review times, racing line and vehicle data afterwards. A track map coloured by speed, time-series charts of G, yaw rate and attitude, and the G-G diagram all follow one playhead. Understeer and oversteer segments are marked on the charts. Export to CSV to analyse the data in external tools. ■ Customisation Theme (dark / light) and accent colour, which channels appear in the readout column, the range of each meter, load display units, render rate and more. ■ Three steps to start 1. Enter your vehicle info (weight, CG height, wheelbase, track, weight distribution). It works on the defaults, but the more accurate you are, the closer the load readout gets to your real car. 2. Mount the phone rigidly, screen upright. 3. Run calibration once before you drive. No sensors handy? Settings has a "Play demo" mode that replays real recorded track data through every feature. ■ About the in-app purchase Lap timing, the data logger and viewer, understeer/oversteer alerts and UI customisation are Premium features, unlocked with a single payment. There is no subscription and nothing auto-renews. ■ Please read This app is a simulated monitor that estimates and displays vehicle attitude, load, G-forces and understeer/oversteer tendency from phone sensors and GPS. It is not a certified measuring instrument or a safety device. All values shown are approximate and are not guaranteed to be accurate real-world measurements. Load is not a load-cell reading; it is a computed estimate. Timing accuracy depends on your device's. This app is intended for competition use in closed environments such as race circuits. Watching the screen while driving is distracted driving and is illegal and punishable under applicable traffic laws. Never watch the screen while driving on public roads. If you use it on public roads you must comply with all applicable laws and do so entirely at your own risk. ## Key features - GPS lap and sector timing - Four-wheel load monitoring - Real-time G-G diagram - Understeer/oversteer alerts - Data logging and playback - Customizable UI themes and units ## Recent user reviews (1 of 1) All indexed reviews: https://appshunter.io/ios/app/quad-g-forcemeter-laptimer/id6792617370/reviews.md ### 5/5 — タイヤの荷重移動アプリ *2026-08-06* タイヤの荷重移動が見れるのが面白い。ドライビングの練習に最適 ## Frequently asked questions about QUAD ### Does QUAD-G ForceMeter + Laptimer have ads? No, QUAD-G ForceMeter + Laptimer does not contain advertisements. It offers a free experience with optional in-app purchases for advanced features. ### What vehicle information is needed for QUAD-G ForceMeter + Laptimer? To get the most accurate load readouts, you need to enter your vehicle's weight, CG height, wheelbase, track width, and weight distribution. The app works with defaults but is more precise with accurate vehicle specs. ### Can QUAD-G ForceMeter + Laptimer be used on any track? Yes, QUAD-G ForceMeter + Laptimer's GPS lap timer works anywhere on Earth. You can set up courses on closed circuits or open point-to-point routes like rally stages. ### What are the in-app purchases for QUAD-G ForceMeter + Laptimer? The in-app purchase unlocks features such as lap timing, the data logger and viewer, understeer/oversteer alerts, and UI customization. The base app is free to download and use. ### How does QUAD-G ForceMeter + Laptimer detect understeer and oversteer? It compares the measured yaw rate against a theoretical neutral-steer reference. If sharp yaw-rate changes are detected in transient conditions, the app alerts you by voice and color, indicating which axle is losing cornering force. ### Can I export my data from QUAD-G ForceMeter + Laptimer? Yes, you can export your recorded session data to CSV format. This allows for further analysis of lap times, racing lines, and vehicle data in external tools. ### What devices does QUAD-G ForceMeter + Laptimer support? QUAD-G ForceMeter + Laptimer is available for iPhone, iPad, and iPod. It is rated for ages 4 and up. ### How often is QUAD-G ForceMeter + Laptimer updated? The app was last updated on August 5, 2026, with version 1.0. Further updates will be released by developer SYNSETECH LTD to improve functionality and add features. ## Version history (last 2 releases) ### 1.1.0 — 2026-08-21 LAP PAGE Swipe right on the measurement screen to open a detail view of the current lap: last and best lap times, the delta to your best, and per-sector split times with sector deltas, all on one screen. Tap the screen to cycle the delta display through three modes (per-sector best, cumulative best, cumulative only). Crossing the control line or a sector line shows the result in large type for a few seconds. CAR ART ON THE GAUGE Choose from six body types: sedan, sports, midship, rear-engine, hot hatch and EV. A top view of the car now sits at the centre of the four-wheel load gauge, making weight transfer easier to read at a glance. MORE CIRCUITS The preset catalogue grows from 35 tracks to 68. 19 circuits in the United States are new, and Japan expands from 21 to 35. A track that is not in the catalogue can still be timed: set the control line yourself from the course setup screen. CALIBRATION A clearer step-by-step flow, with a confirmation prompt before re-calibrating. More robust, with revised logic that now establishes the acceleration-G direction immediately. FIXES Fixed a crash that could occur when switching the driving direction in the course setup screen. ### 1.0 — 2026-08-05 No release notes. ## More apps by SYNSETECH LTD - [GolfDistance Pro](https://appshunter.io/ios/app/golfdistance-pro/id6793210039) All apps by SYNSETECH LTD: https://appshunter.io/developer/6792617372 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-26.*