# PerfExpert - Car Dyno HP Test — Measure Real HP & Torque > Smartphone-based onboard dyno and acceleration timer for car performance testing. (iPhone/iPad app by Claude JOSEPH ANGELIQUE.) - Source: https://appshunter.io/ios/app/perfexpert-car-dyno-hp-test/id549390700 (this page in markdown: same URL + `.md`) - Developer: [Claude JOSEPH ANGELIQUE](https://appshunter.io/developer/549390703) - Category: Sports, Utilities - Price: $8.99 with in-app purchases (on sale, was $12.99) - Rating: 3.70/5 from 12 App Store ratings · 97 written reviews indexed - Age rating: 4+ - Requires: iOS 15.0 · 24 MB - Languages: American English, Bulgarian, French (France), German (Germany), Hebrew, Italian, Norwegian Bokmål, Polish, European Portuguese, Russian and 2 more - Released: 2012-08-08 - Data updated: 2026-09-01 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/perfexpert-car-dyno-hp-test/id549390700/reviews.md ## What is PerfExpert? Know your car's true performance. Turn your smartphone into a professional dyno. Measure the real horsepower and torque of your engine — within 2% of a chassis dynamometer — and time your car's acceleration. No OBD adapter, no cables, no expensive dyno sessions. Just mount your phone, accelerate, and get instant results. Test and compare performance upgrades. Whether you're verifying an ECU remap, testing a new exhaust, or tracking the effect of a chiptuning session, PerfExpert gives you objective, independent data you can trust. HOW IT WORKS 1. Create your car profile Enter your vehicle's weight, tire sizes, and gear ratios. Not sure about a spec? The app guides you through every step. 2. Mount your phone & accelerate Secure your phone in the car — no connection needed. Find a flat, straight road. Accelerate in one gear from low RPM to redline. That's it. 3. Get instant results Power and torque curves appear immediately, just like on a real chassis dynamometer. Compare runs, track your modifications, and share results. MEASUREMENT MODES Dyno — Full power & torque curves vs. engine RPM. Advanced drivetrain loss model, rev limiter detection, and correction standards (DIN, SAE, JIS, CEE, ISO). Results as detailed as a professional chassis dyno. Timed Run — Measure acceleration from a standing start. Speed intervals: 0-100, 100-200, 80-180, 60-160 km/h — 0-60, 60-120, 50-110, 40-100 mph. Distance: quarter mile, eighth mile (with trap speed), 60 ft. Max speed and peak acceleration on every run. KEY FEATURES - 2% accuracy compared to professional chassis dynamometers - No OBD adapter or connection to your car required - Works with your phone's built-in sensors - External GPS available as an in-app option for pro-level precision: RaceBox Mini, Mini S, Micro (rolling start dyno, free phone mounting) - Power correction norms: DIN, SAE, JIS, CEE, ISO — using real-time atmospheric pressure, temperature, and humidity - Interactive charts: pinch to zoom, tap for exact values - Export results as PNG image or shareable web link - Custom units: HP, CV, kW for power — Nm, ft-lb, mkg for torque — km/h, mph for speed PERFEXPERT PRO (optional subscription) - Custom logo on your results - Cloud backup of your results - CSV data export WHO USES PERFEXPERT? - Car enthusiasts who want to know their real HP and torque - Tuners and mechanics verifying ECU remaps, chiptuning, intake, exhaust, or turbo upgrades - Owners comparing before/after results of any modification - Drivers timing their 0-60 mph or 0-100 km/h acceleration - Anyone curious about their car's true performance IMPORTANT NOTES - Dyno mode requires a manual gearbox or an automatic with manual/sequential mode - For best results, use a flat, straight, horizontal road with no traffic - External GPS (available as an in-app option) unlocks additional features: rolling start dyno (no need to stop before measuring) and free phone orientation FAQ and support: https://www.perfexpert-app.com/faq Join the PerfExpert community: https://www.facebook.com/groups/perfexpert/ Privacy Policy: https://www.perfexpert-app.com/privacy-policy Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ ## Key features - Engine power and torque measurement - 0-60 mph and 0-100 km/h acceleration times - Quarter mile and 400m times - Detailed reports with interactive charts - Correction standards (DIN, SAE, ISO, JIS, CEE) - Customizable units - Export results as data files or images ## Pricing and in-app purchases Base price: $8.99. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | Pro for one month | $9.99 | per month | | Pro for one year | $79.99 | per year | ## Chart rankings - #134 in Top Paid · Sports (US App Store) ## Recent user reviews (10 of 97) All indexed reviews: https://appshunter.io/ios/app/perfexpert-car-dyno-hp-test/id549390700/reviews.md ### 5/5 — Custom Dyno *2026-06-05* I put intake and catback exhaust. Shop charge me 500$ CA for a run before and after the modifications. For 20$ I can see a gain 15HP. Just WOW 👍 **Developer response:** Thanks for the great review! Running a before/after on your own mods, without booking dyno time, is exactly what we built PerfExpert for. Enjoy your car and happy tuning! ### 5/5 — Super *2026-02-14* Je viens d’effectuer trois test avec le boîtier RaceBox mini. Très pertinent. **Developer response:** Merci beaucoup pour votre retour ! Content que le combo PerfExpert + RaceBox Mini vous donne satisfaction 👍 ### 1/5 — Não funciona *2026-02-02* Infelizmente não funciona para carros elétricos **Developer response:** Olá Mdca546, Obrigado pelo feedback. Infelizmente, o PerfExpert só funciona com veículos a combustão — isso está indicado na descrição do app na loja. O motivo: o app calcula a potência usando os regimes do motor (RPM) e as relações de transmissão, o que não se aplica aos motores elétricos. O modo "Timed Run" (tempos de aceleração) funciona com qualquer veículo, inclusive elétricos! Obrigado pela compreensão 🙏 ### 1/5 — Null *2025-10-15* Je recommande pas acheter pas vous voulez savoir la puissance de votre voiture faite un passage au banc **Developer response:** Bonjour nahel35160, Merci pour votre retour. PerfExpert offre une précision de l'ordre de 2% lorsque la procédure est bien respectée — suffisant pour comparer avant/après une modification ou valider une reprogrammation. Si vous avez rencontré des résultats incohérents, n'hésitez pas à nous contacter via l'app (Résultat -> Aide ) — on peut analyser vos données et vous aider à obtenir des mesures fiables. Bonne route 🙏 ### 5/5 — Muito top *2025-05-22* Aplicativo top de mais! Se colocar todos os dados que são pedidos corretamente, o aplicativo marca a potencia muito próxima da real! Passei meu carro no dinamômetro e veio 132cv de roda, no aplicativo ao fazer o teste marcou 131,6cv. ### 5/5 — Au top *2025-02-21* Je la possède depuis des années. C’est top avec 10 aine de véhicules. Manque parfois des infos, suffit de chercher sur Google **Developer response:** Merci pour ton retour positif! ### 4/5 — Ok *2024-11-13* Super applis. A quand une mise à jour pour avoir plus de véhicule dans la base de données? **Developer response:** Merci pour ton retour positif! La base de données AutoRef est régulièrement mise à jour et les nouveaux véhicules sont immédiatement disponibles sur l'application sans nécessité que celle-ci soit mise à jour. Vous pouvez demander d'ajouter des nouveaux modèles en nous écrivant à support@perfexpert-app.com. ### 5/5 — Bien *2024-06-21, version 2.2.3* Bien ### 5/5 — Teste de puissance *2024-06-14* L’application est d’une extrême précision à chaque je m’en sers très régulièrement et je suis très content de cette application. Je recommence cette application autour de moi surtout avec le Boitier RACE Mini et un support pour GoPro. Le produit est vraiment génial. Je trouve l’application beaucoup mieux qu’un banc d’essai car on a réellement les informations de coefficient de friction de l’air et de la rugosité de la route avec l’application. Je connecte de quoi contrôler Air Fuel Ratio et l EGT et j’enregistre avec HPTUNER OU autotuner et parfois innovate . Merci au développement de l’application et du travail accompli après ces années. Quentin Heckmann **Developer response:** Merci beaucoup pour ton retour! ### 5/5 — Super *2024-02-12* Très bonne appli. Fiable ! Il faut faire 3 ou 4 test et en faire une moyenne. Je l’utilise maintenant depuis 4/5 ans … **Developer response:** Merci pour ton retour! ## Frequently asked questions about PerfExpert ### What does PerfExpert do? PerfExpert turns your smartphone into an onboard dyno and acceleration timer. It measures your car's engine power and torque with high accuracy, as well as acceleration times like 0-60 mph and quarter mile. It provides detailed reports with interactive charts for analysis. ### How does the dyno test work without external sensors? The app uses your phone's internal sensors, primarily the accelerometer, to capture acceleration data. By performing a full-throttle pull in a single gear on a flat, straight road, the app calculates power and torque. No connection to your car's OBD port or external sensors is needed for basic tests. ### What are the key features of PerfExpert? Key features include accurate horsepower and torque measurement with rev limiter detection and power loss modeling, timed run tests for various acceleration milestones, application of standard correction standards using real-time ambient conditions, and the ability to export results as data files or PNG images. ### Is PerfExpert compatible with all cars? The app is designed for manual gearboxes or automatic gearboxes with a manual mode. Dyno tests are not compatible with automatic gearboxes that lack a manual mode. You will need to create a car profile with key specifications like curb weight, tire size, and displacement. ### What is the cost of PerfExpert? The app is free to download and use for basic functions. However, advanced features or enhanced accuracy, such as rolling start dyno runs, may require in-app purchases or a Pro subscription, indicated by 'PerfExpert Pro su'. ## Version history (last 5 releases) ### 2.4.0 — 2026-08-18 What's new in PerfExpert 2.4.0: - External GPS Unlock: now available as a one-time purchase — yours forever - PerfExpert Pro: subscribe to unlock custom logo on your charts, cloud backup, and CSV data export - Custom chart logo: add your own logo or brand to your dyno and acceleration reports (Pro) - Cloud backup: your results are now safely stored in the cloud (Pro) - Atmospheric conditions: more accurate temperature, pressure and humidity, with a more reliable retrieval - Correction norm can now be disabled - Bug fixes and stability improvements ### 2.3.1 — 2025-06-04 New in 2.3.1: • Fixed an issue where sensor rate and smoothing were incorrectly calculated when opening results created before version 2.3.0 New in 2.3.0: • Added support for external GPS devices: Racebox.ru, RaceBox Mini, Mini S, and Micro (PerfExpert Pro subscription required) • Added the ability to make a support request about a result • Improvements to internal sensors mode: • Removed mandatory calibration • Prevented START button if the car is not fully stopped • Improved accuracy • Bug fixes and stability improvements ### 2.3.0 — 2025-05-28 • Added support for external GPS devices: Racebox.ru, RaceBox Mini, Mini S, and Micro (PerfExpert Pro subscription required) • Added the ability to make a support request about a result • Improvements to internal sensors mode: • Removed mandatory calibration • Prevented START button if the car is not fully stopped • Improved accuracy • Bug fixes and stability improvements ### 2.2.3 — 2022-04-29 - Support for the last VBox Sport 10hz - Added the possibility to connect with Apple - Now you can select up to the 5th gear for Dyno tests - Fixed the car Setup name on PerfExpert Network comparisons - Fixed the gear speed value showing in Km/h instead of Mph in the Gearbox screen when Mph unit is selected - Fixed weather data retrieving. - Fixed a communication problem with the PerfExpert Network server ### 2.2.2 — 2020-01-13 - Fixed the Image export - Fixed crash in Results screen when there is no car created in the app (fresh installation) - Fixed the result' graph displaying on iOS versions below 11.0 - Fixed the help links in the Measurement screen ## Apps similar to PerfExpert | App | Rating | Price | Category | | --- | --- | --- | --- | | [ST1 Track](https://appshunter.io/ios/app/st1-track/id6753221554) | — | Free | Sports | | [PGEAR](https://appshunter.io/ios/app/pgear/id1429523554) | 5.0 (4) | Free | Sports | | [dragy·Lap - New GPS Lap Timer](https://appshunter.io/ios/app/dragylap-new-gps-lap-timer/id1617703369) | — | Free | Sports | | [CarTest - Performance Tester](https://appshunter.io/ios/app/cartest-performance-tester/id1534136951) | 4.2 (13) | Free | Sports | | [PerfectPower](https://appshunter.io/ios/app/perfectpower/id539294038) | — | $33.00 | Sports | | [Race Buddy: Lap & Drag Timer](https://appshunter.io/ios/app/race-buddy-lap-and-drag-timer/id1440030429) | 3.6 (11) | Free | Sports | ## Related topics [dyno car](https://appshunter.io/ios/topics/dyno-car) --- *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 2026-09-01.*