PerfExpert

Name: PerfExpert
Rating: 3.7 (12 reviews)
Author: Claude JOSEPH ANGELIQUE

by Claude JOSEPH ANGELIQUE

iPhone · iPad

Active Last checked 31 Jul 2026

App Store ↗

Quick verdict

What it is: Store information collected; independent summary not yet available.
At a glance: $12.99
In-app purchases

Categories and search queries

Official categories

Sports
Utilities

AppCorpus categories

Key functions

Function	Availability	Access	Scope	Evidence
In-app purchases	Yes	Limited free	—	Store published

Screens

No screenshots collected yet.

Pricing & paywalls

App Store

Price: $12.99
In-app purchases

Last verified 31 Jul 2026

Ratings & reviews

App Store

3.7 12 ratings · App Store

4/5Need a little help
Trying to put all the numbers in properly to dunk the car but I have a 2017 civic lx hatch that is a CVT transmission. I have full bolt ons and running full e85. In the fuel option it only lets me choose between gasoline or diesel and the second problem I have is that I don’t really have any defined gear ratios besides my first gear final drive and reverse. Would the app still be accurate missing those parameters?

Justin McGurn · 31 Jul 2026
5/5Very accurate, useful and stable
I have tested numerous apps which some where OBD2 connected and some like this one, independent of OBD2 being a stand alone one. I was surprised to find out how accurate this app in comparison to a standard dyno. In fact, I feel that this app gives me a more reliable reading in comparison to commercial dyno where parameters can be adjusted by the operators which may not be in line with the proper characteristic of my car. One improvement that I would suggest is: to allow the user to choose the 2 or 3 results that will show up as the “average “ and allow to present this “average “ in a graph. Great app.

gyrt64t3sg · 31 Jul 2026
3/5Calibration
Once I go through the calibration routine, it gives me no choice to move onto a test-only a “back” button that takes me back to the “calibration” button, forcing me to start over, in a circle. What may I be doing wrong?

Viper corvette stang lover · 31 Jul 2026
5/5Nice Accuracy
Key to this app! Key in Correct info. And this app is Great. Excellent tuning tool.

SSG_Carter · 31 Jul 2026
1/5Doesn't work
I put all the work in setting up my car but it A) can't retrieve weather data and B) apparently the GPS doesn't work either because it never detects my speed to start measuring.

TheKis3r · 31 Jul 2026

Privacy & accessibility

App Store

Privacy

Data Linked to You — Analytics — Contact Info — Email Address Developer declared
Data Linked to You — Analytics — Contact Info — Name Developer declared
Data Linked to You — Analytics — Identifiers — Device ID Developer declared
Data Linked to You — Analytics — Identifiers — User ID Developer declared
Data Linked to You — Analytics — Usage Data — Product Interaction Developer declared
Data Linked to You — App Functionality — Contact Info — Email Address Developer declared
Data Linked to You — App Functionality — Contact Info — Name Developer declared
Data Linked to You — App Functionality — Identifiers — Device ID Developer declared
Data Linked to You — App Functionality — Identifiers — User ID Developer declared
Data Linked to You — Contact Info Developer declared
Data Linked to You — Identifiers Developer declared
Data Linked to You — Usage Data Developer declared
Data Not Linked to You — Analytics — Diagnostics — Crash Data Developer declared
Data Not Linked to You — Diagnostics Developer declared

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Accessibility

No accessibility labels collected yet.

Versions

App Store

1.0.0
1.0.1
- Increased tolerance to vibration during the initialization phase (during WAIT phase) - Fixed a crash in the Dyno screen when no gear is selected - Improved editing of gear ratios - Link to new support forum - Increase the accuracy of displayed speed values - "0 to Mph" times are now by 10Mph steps - Improved Timed Run averages when they were not made on the same distance - Improved user interface
1.0.2
This new version fixes a few bugs that were reported by some users and add support for iOS6 and iPhone 5. Thank you all for your feedbacks, feel free to send us an email to [email protected] for suggestions and bug reports. Changes in this version: - Support for iOS6 and iPhone 5 screen - Possibility to choose a set of predefined units (metric or imperial) from a single button - Improved auto scaling of the torque curve on the graphs - Fixed iPad bug preventing to choose another transmission type than FWD - Fixed units management in car sheet screen
1.1.0
- Added the possibility to edit car parameters after measurement is performed : for each result, you can now edit car parameters individually, so result values are recalculated on the fly. This new feature is retroactive to your old measurements :-) - Modification of the calibration procedure : there is now one additional step (step 4) - Added a link to the video tutorial calibration - Fixed some crashes when opening certain graph when the selected unit is mKg - Fixed various bugs and performance improvements - Attention, we now collect anonymous statistics about the make, model and year of the new cars that you will enter from this version. This is to know about what models to prioritize when building the new online car sheet database that will be available in next version ;-)
1.1.1
- Added the possibility to edit weather data after measurement is performed : for each result, you can now edit weather data individually, so result values are recalculated on the fly. This new feature is retroactive to your old measurements :-) - Fixed an error on weight conversion only with Lb unit (pound). For those who had selected Lb for weight unit : update to this version, then choose Kg as weight unit, then back to Lb unit. After that, edit car weight in your existing car sheets and in each existing results. - Fixed various bugs and performance improvements - Attention, we now collect anonymous statistics about the make, model and year of the new cars that you enter. This is to know about what models to prioritize when building the new online car sheet database that will be available in next major version (1.2.0) ;-)
1.2.0
Discover the firsts features of PerfExpert Network! By logging in to it, you can publish your test results on the web, thereby facilitating sharing with who you want. To do so, you just have to publish the result's web link on your favorite social networks. Those with whom you have shared it will see your test report directly from their web browser. Main new features in this release (non exhaustive list): - Possibility to publish test results on the web to facilitate sharing - Ability to set an avatar for each car - Sharing / Export results as a picture - Sending measurements data by email Also the problem of automatic weather data retrieving has been fixed. Do not hesitate to contact us by email for any comments, questions or suggestions : [email protected] Enjoy with sharing features;-)
1.2.1
- New iOS 7 user interface - Enhancement of graph readability - Improvement of the avatar cropping feature - Bug fix and general UI improvements
1.2.2
- Now displays also the horsepower at the wheels - Support iOS 8, and also new devices : iPhone 6 and iPhone 6 plus - Bulgarian translation (Thanks to Krum Zhikov) - You can choose to show either engine or wheels horsepower on local graphs and on the PerfExpert Network thanks to an option in the Settings screen - Improved weather data retrieving for horsepower correction - Faster uploading of results to the PerfExpert Network - Set the max test distance to 1000m to allow dyno tests on the 4th gear for very high performance cars that loose traction on 3rd gear - Bug fixes and performance improvements
1.3.0
We have improved the PerfExpert physics model to provide even better measurement consistency : - Improvement of smoothing, allowing cleaner result curves even for test performed with windshield phone mount - Increased the car take off detection accuracy (data acquisition trigger). So now you don't need to adjust the 'Trigger' parameter manually, it has been removed from the Settings screen and PerfExpert automatically detects the best Trigger value for each measurement - Improved rev limiter detection accuracy and robustness. Now the engine rev limiter is always well detected even if the phone is not isolated from car vibrations. - You can now change the smoothing level for a test after it has been performed
1.3.1
- Automatic Trigger is now more sensitive for better accuracy on Dyno tests. - Automatic trigger is now used only for Dyno mode. The car take off detection sensitivity is now managed manually with the "Timed Run trigger" in the Settings screen. - Changed weather server to World Weather Online - Japanese, Italian and Russian translation (special thanks to Shin Puru, Peppe Cupra R and phant0m) - Fixed bugs - Performance improvements
1.4.0
- Now your car profiles are synchronized across all your devices through your PerfExpert Network account. - Improvement of phone movement detection during the "WAIT" phase just after you press the "START" button : real phone movements are better detected to prevent starting the test, while strong vibrations no longer prevent starting the test. - Added the measurement duration information to the test result - You can connect PerfExpert to the 20Hz external GPS VBox Sport from Racelogic to perform Dyno and Timed Run measurements without the need to mount the phone inside the car, and without the need to stop the car before pressing the START button. To activate this feature, turn the VBox Sport mode to ON in the settings screen.
1.4.1
- Now, if a measurement is considered not valid by the app, an explicit message is displayed to help you to understand what was wrong. - We have also improved the gearbox ratios edition interface for advanced car sheet. - Bug fixes and app stability improvements.
1.5.0
- Now you can get car parameter values from our car database : we invite you to update your car description in the car profile screen, this will automatically update all undefined parameters of your car profile with values from our database. - All newly created car profile will be pre-filled with parameters from our database, if those parameters are available. Other parameters are left undefined. - We have also improved the gearbox information screen. It's now possible to enter the speed at 1000rpm for a gear, instead of entering its ratio, when you don't know this one.
1.5.1
- Fixed the calibration problem - Fixed the crash when opening old simplified sheets - Improved management of incomplete car profiles (with missing parameters)
1.5.2
This is a minor update that mainly consists of fixing bugs and improving performances on user interface and car profile management.
2.0
Try the new test session preparation assistant, that helps you to setup the app before measuring your car performances. By managing the fuel weight calculation and letting you better control weather data retrieving, you will get accurate results easier than before.
2.0.1
- Fixed a bug occurring in the additional weight preparation screen, when the selected unit is "Lb". - Improved car parameters help texts - Added metric and imperial units for the drag area (Cd.A) parameter - Bug fixes and performances improvement ---- Try the new test session preparation assistant! It helps you to setup the app before measuring your car performances. By managing the fuel weight calculation and letting you better control weather data retrieving, you will get accurate results easier than before.
2.1.0
- User interface improvements to manage iPhone 6 screens and above - Fixed Dyno and Timed Run graphs smoothing levels that was slightly too high due to a previous modification of measurement algorithm : this will cause little changes on some of your existing results. - Fixed the car avatar crop feature - Fixed the web link sharing for Timed Run results
2.1.1
v2.1.1 - Fixed the calibration screen guide and countdown wasn't appearing on some devices. v2.1.0 - User interface improvements to manage iPhone 6 screens and above - Fixed Dyno and Timed Run graphs smoothing levels that was slightly too high due to a previous modification of measurement algorithm : this will cause little changes on some of your existing results. - Fixed the car avatar crop feature - Fixed the web link sharing for Timed Run results
2.2.0
- Measurement procedure is now easier to perform thanks to sound effects that inform you when measurement initialization is done and when the dyno start speed is reached. - Added more smoothing levels. Now there are 6 levels (Low, Low+, Medium, Medium+, High, High+). - Added a new information to results : data acquisition rate. - Added Russian, Bulgarian and Norwegian translations. - Updated translations. - Now, when your connection to the PerfExpert Network has expired, the app prompts you to reconnect - Fixed the speed unit in the measurement screen when unit is Mph - Fixed car profile description in the results Average screen
2.2.1
- Fixed additional weight value in results, this may cause your current Dyno results to be recalculated - Added Polish and Spanish translations - Improved UI on iPhone devices with notch (iPhone X and newer) - Fixed crashes when sharing result Image on iOS 13 - Fixed the expired session token problem - Fixed Facebook Login - Fixed the dead and outdated links in the Settings screen
2.2.2
- 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
2.2.3
- 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
2.3.0
• 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
2.3.1 · 4 Jun 2025
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

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Alternatives

dragy·Lap - New GPS Lap Timer — Same category + similar ratings
dragy Connect — Same category + similar ratings

Availability by market

Data quality & evidence

Page completeness: Live store listing
Last verified: 31 Jul 2026
Sources: App Store

Independent summary has not been published yet.
Screenshots: not yet collected

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Compare PerfExpert with dragy·Lap - New GPS Lap Timer.

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GET /api/v3/apps/549390700

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          "author": "Justin McGurn",
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          "body": "I have tested numerous apps which some where OBD2 connected and some like this one, independent of OBD2 being a stand alone one. I was surprised to find out how accurate this app in comparison to a standard dyno. In fact, I feel that this app gives me a more reliable reading in comparison to commercial dyno where parameters can be adjusted by the operators which may not be in line with the proper characteristic of my car. One improvement that I would suggest is: to allow the user to choose the 2 or 3 results that will show up as the “average “ and allow to present this “average “ in a graph. Great app.",
          "author": "gyrt64t3sg",
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          "author": "Viper corvette stang lover",
          "date": "31 Jul 2026"
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          "author": "SSG_Carter",
          "date": "31 Jul 2026"
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      "notes": "- Increased tolerance to vibration during the initialization phase (during WAIT phase) - Fixed a crash in the Dyno screen when no gear is selected - Improved editing of gear ratios - Link to new support forum - Increase the accuracy of displayed speed values - \"0 to Mph\" times are now by 10Mph steps - Improved Timed Run averages when they were not made on the same distance - Improved user interface"
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      "version": "1.1.0",
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      "notes": "- Added the possibility to edit car parameters after measurement is performed : for each result, you can now edit car parameters individually, so result values are recalculated on the fly. This new feature is retroactive to your old measurements :-) - Modification of the calibration procedure : there is now one additional step (step 4) - Added a link to the video tutorial calibration - Fixed some crashes when opening certain graph when the selected unit is mKg - Fixed various bugs and performance improvements - Attention, we now collect anonymous statistics about the make, model and year of the new cars that you will enter from this version. This is to know about what models to prioritize when building the new online car sheet database that will be available in next version ;-)"
    },
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      "version": "1.1.1",
      "released_at": null,
      "notes": "- Added the possibility to edit weather data after measurement is performed : for each result, you can now edit weather data individually, so result values are recalculated on the fly. This new feature is retroactive to your old measurements :-) - Fixed an error on weight conversion only with Lb unit (pound). For those who had selected Lb for weight unit : update to this version, then choose Kg as weight unit, then back to Lb unit. After that, edit car weight in your existing car sheets and in each existing results. - Fixed various bugs and performance improvements - Attention, we now collect anonymous statistics about the make, model and year of the new cars that you enter. This is to know about what models to prioritize when building the new online car sheet database that will be available in next major version (1.2.0) ;-)"
    },
    {
      "store": "apple",
      "version": "1.2.0",
      "released_at": null,
      "notes": "Discover the firsts features of PerfExpert Network! By logging in to it, you can publish your test results on the web, thereby facilitating sharing with who you want. To do so, you just have to publish the result's web link on your favorite social networks. Those with whom you have shared it will see your test report directly from their web browser. Main new features in this release (non exhaustive list): - Possibility to publish test results on the web to facilitate sharing - Ability to set an avatar for each car - Sharing / Export results as a picture - Sending measurements data by email Also the problem of automatic weather data retrieving has been fixed. Do not hesitate to contact us by email for any comments, questions or suggestions : [email protected] Enjoy with sharing features;-)"
    },
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      "released_at": null,
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    },
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      "version": "1.2.2",
      "released_at": null,
      "notes": "- Now displays also the horsepower at the wheels - Support iOS 8, and also new devices : iPhone 6 and iPhone 6 plus - Bulgarian translation (Thanks to Krum Zhikov) - You can choose to show either engine or wheels horsepower on local graphs and on the PerfExpert Network thanks to an option in the Settings screen - Improved weather data retrieving for horsepower correction - Faster uploading of results to the PerfExpert Network - Set the max test distance to 1000m to allow dyno tests on the 4th gear for very high performance cars that loose traction on 3rd gear - Bug fixes and performance improvements"
    },
    {
      "store": "apple",
      "version": "1.3.0",
      "released_at": null,
      "notes": "We have improved the PerfExpert physics model to provide even better measurement consistency : - Improvement of smoothing, allowing cleaner result curves even for test performed with windshield phone mount - Increased the car take off detection accuracy (data acquisition trigger). So now you don't need to adjust the 'Trigger' parameter manually, it has been removed from the Settings screen and PerfExpert automatically detects the best Trigger value for each measurement - Improved rev limiter detection accuracy and robustness. Now the engine rev limiter is always well detected even if the phone is not isolated from car vibrations. - You can now change the smoothing level for a test after it has been performed"
    },
    {
      "store": "apple",
      "version": "1.3.1",
      "released_at": null,
      "notes": "- Automatic Trigger is now more sensitive for better accuracy on Dyno tests. - Automatic trigger is now used only for Dyno mode. The car take off detection sensitivity is now managed manually with the \"Timed Run trigger\" in the Settings screen. - Changed weather server to World Weather Online - Japanese, Italian and Russian translation (special thanks to Shin Puru, Peppe Cupra R and phant0m) - Fixed bugs - Performance improvements"
    },
    {
      "store": "apple",
      "version": "1.4.0",
      "released_at": null,
      "notes": "- Now your car profiles are synchronized across all your devices through your PerfExpert Network account. - Improvement of phone movement detection during the \"WAIT\" phase just after you press the \"START\" button : real phone movements are better detected to prevent starting the test, while strong vibrations no longer prevent starting the test. - Added the measurement duration information to the test result - You can connect PerfExpert to the 20Hz external GPS VBox Sport from Racelogic to perform Dyno and Timed Run measurements without the need to mount the phone inside the car, and without the need to stop the car before pressing the START button. To activate this feature, turn the VBox Sport mode to ON in the settings screen."
    },
    {
      "store": "apple",
      "version": "1.4.1",
      "released_at": null,
      "notes": "- Now, if a measurement is considered not valid by the app, an explicit message is displayed to help you to understand what was wrong. - We have also improved the gearbox ratios edition interface for advanced car sheet. - Bug fixes and app stability improvements."
    },
    {
      "store": "apple",
      "version": "1.5.0",
      "released_at": null,
      "notes": "- Now you can get car parameter values from our car database : we invite you to update your car description in the car profile screen, this will automatically update all undefined parameters of your car profile with values from our database. - All newly created car profile will be pre-filled with parameters from our database, if those parameters are available. Other parameters are left undefined. - We have also improved the gearbox information screen. It's now possible to enter the speed at 1000rpm for a gear, instead of entering its ratio, when you don't know this one."
    },
    {
      "store": "apple",
      "version": "1.5.1",
      "released_at": null,
      "notes": "- Fixed the calibration problem - Fixed the crash when opening old simplified sheets - Improved management of incomplete car profiles (with missing parameters)"
    },
    {
      "store": "apple",
      "version": "1.5.2",
      "released_at": null,
      "notes": "This is a minor update that mainly consists of fixing bugs and improving performances on user interface and car profile management."
    },
    {
      "store": "apple",
      "version": "2.0",
      "released_at": null,
      "notes": "Try the new test session preparation assistant, that helps you to setup the app before measuring your car performances. By managing the fuel weight calculation and letting you better control weather data retrieving, you will get accurate results easier than before."
    },
    {
      "store": "apple",
      "version": "2.0.1",
      "released_at": null,
      "notes": "- Fixed a bug occurring in the additional weight preparation screen, when the selected unit is \"Lb\". - Improved car parameters help texts - Added metric and imperial units for the drag area (Cd.A) parameter - Bug fixes and performances improvement ---- Try the new test session preparation assistant! It helps you to setup the app before measuring your car performances. By managing the fuel weight calculation and letting you better control weather data retrieving, you will get accurate results easier than before."
    },
    {
      "store": "apple",
      "version": "2.1.0",
      "released_at": null,
      "notes": "- User interface improvements to manage iPhone 6 screens and above - Fixed Dyno and Timed Run graphs smoothing levels that was slightly too high due to a previous modification of measurement algorithm : this will cause little changes on some of your existing results. - Fixed the car avatar crop feature - Fixed the web link sharing for Timed Run results"
    },
    {
      "store": "apple",
      "version": "2.1.1",
      "released_at": null,
      "notes": "v2.1.1 - Fixed the calibration screen guide and countdown wasn't appearing on some devices. v2.1.0 - User interface improvements to manage iPhone 6 screens and above - Fixed Dyno and Timed Run graphs smoothing levels that was slightly too high due to a previous modification of measurement algorithm : this will cause little changes on some of your existing results. - Fixed the car avatar crop feature - Fixed the web link sharing for Timed Run results"
    },
    {
      "store": "apple",
      "version": "2.2.0",
      "released_at": null,
      "notes": "- Measurement procedure is now easier to perform thanks to sound effects that inform you when measurement initialization is done and when the dyno start speed is reached. - Added more smoothing levels. Now there are 6 levels (Low, Low+, Medium, Medium+, High, High+). - Added a new information to results : data acquisition rate. - Added Russian, Bulgarian and Norwegian translations. - Updated translations. - Now, when your connection to the PerfExpert Network has expired, the app prompts you to reconnect - Fixed the speed unit in the measurement screen when unit is Mph - Fixed car profile description in the results Average screen"
    }
  ],
  "alternatives": [
    {
      "app_id": 1617703369,
      "name": "dragy·Lap - New GPS Lap Timer",
      "url": "https://appcorpus.com/apps/dragylap-new-gps-lap-timer-1617703369",
      "reason": "Same category + similar ratings"
    },
    {
      "app_id": 1260905448,
      "name": "dragy Connect",
      "url": "https://appcorpus.com/apps/dragy-connect-1260905448",
      "reason": "Same category + similar ratings"
    }
  ],
  "evidence_summary": {
    "index_state": "S1",
    "evidence_level": 1,
    "level_label": "Live store listing",
    "indexable": true,
    "last_verified_at": "2026-07-31",
    "unknown_fields": [
      "Independent summary has not been published yet.",
      "Screenshots: not yet collected"
    ],
    "sources": [
      "App Store"
    ]
  },
  "availability_markets": {
    "live": [
      "us"
    ],
    "selected": "us",
    "note": null
  },
  "feature_events": {
    "events": []
  },
  "features_slice": {
    "plans": [],
    "features": [],
    "unknown_features": [],
    "data_cutoff": "31 Jul 2026"
  }
}