# PerfExpert - Car Dyno HP Test

> Measure your car's real HP & torque with 2% dyno accuracy. No OBD needed!

Canonical page: [https://chrome-stats.com/d/com.perfexpert](https://chrome-stats.com/d/com.perfexpert)

## Overview

- **ID:** `com.perfexpert`
- **Platform:** Android
- **Type:** Android app
- **Status:** Available
- **Publisher:** PerfExpert
- **Category:** AUTO\_AND\_VEHICLES
- **Downloads:** 26,827
- **Rating:** 2.46 / 5 (862 ratings)
- **Version:** 2.4.5
- **Last updated:** 2026-08-28
- **First published:** 2011-07-03
- **Publisher country:** FR
- **Size:** 8.76 MB
- **Data as of:** 2026-09-24
- **Store listing:** [Google Play Store](https://play.google.com/store/apps/details?id=com.perfexpert)
- **Website:** [https://www.perfexpert-app.com](https://www.perfexpert-app.com/)
- **Privacy policy:** [https://www.perfexpert-app.com/privacy-policy](https://www.perfexpert-app.com/privacy-policy)

## Description

**PerfExpert - Car Dyno HP Test** turns your Android phone into a portable performance testing tool. Measure horsepower and torque with accuracy comparable to a professional chassis dynamometer, without an OBD adapter, cables, or expensive dyno sessions. Create a vehicle profile, mount your phone, perform a test run, and instantly view detailed power and torque curves.

Use Dyno mode to analyze engine performance, drivetrain losses, and power corrections, or measure acceleration with 0–60 mph, 0–100 km/h, quarter-mile, eighth-mile, trap speed, and other timed runs. Compare modifications such as ECU remaps, exhausts, intake systems, and turbo upgrades. View interactive charts, export results as PNG or CSV with PerfExpert Pro, share web reports, and optionally connect compatible RaceBox GPS devices for enhanced precision and rolling-start testing.

## Rankings

- #388,503 — Overall

## Permissions and access

### Permissions

- `android.permission.ACCESS_ADSERVICES_AD_ID`
- `android.permission.ACCESS_ADSERVICES_ATTRIBUTION`
- `android.permission.ACCESS_COARSE_LOCATION`
- `android.permission.ACCESS_FINE_LOCATION`
- `android.permission.ACCESS_NETWORK_STATE`
- `android.permission.BLUETOOTH_CONNECT`
- `android.permission.BLUETOOTH_SCAN`
- `android.permission.HIGH_SAMPLING_RATE_SENSORS`
- `android.permission.INTERNET`
- `android.permission.POST_NOTIFICATIONS`
- `android.permission.RECEIVE_BOOT_COMPLETED`
- `android.permission.VIBRATE`
- `android.permission.WAKE_LOCK`
- `com.android.vending.BILLING`
- `com.android.vending.CHECK_LICENSE`
- `com.google.android.c2dm.permission.RECEIVE`
- `com.google.android.finsky.permission.BIND_GET_INSTALL_REFERRER_SERVICE`
- `com.perfexpert.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION`

## Review summary

Users appreciate the app's detailed configuration options and potential for accurate dyno measurements when correctly calibrated. However, common issues include frequent crashes, difficulty completing calibration and runs, and inconsistent or inaccurate results especially at higher power levels. Many users report poor or no customer support and frustrations with app complexity and missing vehicle support. While some find it functional after effort, the overall experience is marred by technical instability and usability challenges.

### Pros

- The app provides very detailed and technical configuration options for various car models, which some users find attractive.
- When calibration and settings are done correctly, the app can deliver accurate horsepower and torque measurements comparable to a real dyno.
- Manual entry of weather data is available, helping to reduce unnecessary automatic updates.
- The calibration process, although sometimes requiring multiple attempts, is considered manageable by some users.
- The app supports custom gear ratios and vehicle parameters, offering a comprehensive dyno simulation experience.

### Cons

- The app frequently crashes and often fails to complete calibration or dyno runs, causing user frustration.
- Results are reported as wildly inconsistent and inaccurate, especially when measuring horsepower over 400bhp, with values jumping significantly between runs.
- Customer support is largely unresponsive, sometimes taking months to reply or failing to reply at all, leading to poor user assistance.
- The app lacks support for certain cars or drivetrain configurations, such as automatic transmissions or specific gear inputs (e.g., 5th gear), limiting usability.
- The calibration instructions and app interface lack clarity, making it difficult for users to perform correct setup; the app is described as temperamental and overly complicated for first-time users.

## Similar extensions and apps

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- [DynoRoad](https://chrome-stats.com/d/com.magicmotorsport.dynoroad) — 37,649 users, 3.09 / 5
- [True Power: Dyno & Accel](https://chrome-stats.com/d/com.truepower) — 7,658 users
- [Performance Telemetry Pro](https://chrome-stats.com/d/com.seu.telemetria_veicular) — 43 users
- [DynoRoad RC](https://chrome-stats.com/d/com.magicmotorsport.dynoroad.rc) — 1,679 users
- [Log Dyno Horsepower CSV Dyno](https://chrome-stats.com/d/com.ProfiSoft.LogDyno) — 3,244 users, 4.29 / 5
- [Harry's Dyno](https://chrome-stats.com/d/com.harrys.dyno) — 1,983 users
- [Virtual Dyno Mobile](https://chrome-stats.com/d/com.virtualdyno.android) — 3,480 users, 3.28 / 5
- [PerfectPower](https://chrome-stats.com/d/ch.perfectpower.PerfectPower) — 1,331 users
- [QuickRun](https://chrome-stats.com/d/com.quickrun.app) — 22 users
- [Torque Pro (OBD 2 & Car)](https://chrome-stats.com/d/org.prowl.torque) — 4,611,660 users, 3.97 / 5

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Source: [Chrome-Stats](https://chrome-stats.com/d/com.perfexpert)