# Log Dyno — Measure Torque & Horsepower > Mobile app to measure car torque and horsepower from datalog files. (iPhone/iPad app by Adam Keninger.) - Source: https://appshunter.io/ios/app/log-dyno/id1453544823 (this page in markdown: same URL + `.md`) - Developer: [Adam Keninger](https://appshunter.io/developer/966549024) - Category: Sports, Utilities - Price: $13.99 - Rating: 3.40/5 from 10 App Store ratings · 13 written reviews indexed - Age rating: 4+ - Requires: iOS 9.0 · 128 MB - Languages: American English - Released: 2019-03-03 - Data updated: 2026-08-31 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/log-dyno/id1453544823/reviews.md ## What is Log Dyno? Measuring your car's torque and horsepower has never been easier, now that you can do it with the help of your mobile device and this digital Dyno. You just need to open your datalog of a pull, and Log Dyno will do the rest. You can send your CSV file from your email, browser, or any app to Log Dyno which will Open the datalog from the app right away and give you a measurement, or you can save your CSV file to the Log Dyno folder in your Files app, for easy access from the in-app file browser. You can use any CSV or MSL file that contains RPM data which is needed to accurately measure Horsepower and Torque. From the torque curve and gear ratios, the app will also recommend optimal gear shift points for each gear to ensure maximum acceleration. This makes sure you know when to shift, so you always have the most possible power at the wheels. Corrections: ● Uncorrected ● SAE J1349 ● STD ● DIN 70020 ● ISO 1585 Power Units: ● WHP ● BHP ● PS ● KW Torque Units: ● LB-FT ● NM Either at the wheels or at the crank Compare multiple measurements! You can save each one of your Dyno measurements, and compare them, or just analyze them interactively. What datalog files can be used? ● JB4 ● MHD ● ProTool ● COBB ● MegaSquirt ● ProTool ● Bootmod3 ● and any other CSV file This is the easiest way to have your torque and horsepower measured with a virtual dyno using only your mobile phone and your datalog. You can see if your mods or tune work right away, and compare them. Log Dyno has been compared to multiple real life dyno sheets, and measurements were spot on, with multiple different vehicles How does it work? #1. Datalog your vehicle Take the log just like a dyno pull, in one given gear, from low rpm to high rpm. Try to avoid wheelspin as it can cause spikes in the graph. #2. Set up your vehicle data The dyno app requires some data about your vehicle. You’ll be asked to set values for the following: ● Car Name ● Weight ● Tank Capacity ● Tire Size ● DT% ● Drag Coefficient ● Frontal Area #3. Share the results! You can share your results right from the virtual dyno measurement page to basically any app or post it to any social network or email it. Of course, you can just save the results in your phone gallery too. How accurate is the dyno measurement? If you have set your vehicle data correctly, the results our dyno app gives will be the same as the results a real dyno will give you. Also, keep in mind that wheelspin may result in spikes in the graph. If you are unable to avoid it, you’ll still get accurate results, you just need to ignore the spikes. The best thing about our dyno app is that you can see right away how your mods work after datalogging. Now, you don't have to go to the dyno if you want to measure any small modification or just never had your car's power measured. You can see right away how your mods or tune work after datalogging. You can dyno unlimited times and unlimited vehicles for the fraction of the price of a dyno measurement. You have to set your car up, how much it weighs, its tire size, the gear ratios, and also what your car drag coefficient and frontal area are, which the app will help in determining. After specifying for which gear you had the datalog taken and specifying the driver, passenger, and possible cargo weight, you can open the CSV or MSL file. Based on your car data and environmental values, the app generates a torque and horsepower curve, which you can analyze. The app also points out the peak values, and you will be able to see at what rpm you made the most torque and the most power. If you have any questions feel free to send an email: profisoftgames@gmail.com ## Key features - Measure torque and horsepower from datalogs - Virtual dyno analysis - Optimal gear shift recommendations - Compare multiple measurements - Supports various datalog file formats - Customizable vehicle data input ## Recent user reviews (10 of 13) All indexed reviews: https://appshunter.io/ios/app/log-dyno/id1453544823/reviews.md ### 1/5 — Don’t buy *2026-07-14* Complete waste of money ### 1/5 — Waste of Money *2024-03-15* - Bad Interface - Hard to use - Not even worth 1.99$ - Regret the waste of money ### 5/5 — This works. *2022-12-16* This app works if you use it correctly. Is comparable to other virtual dynos you will find on the web. ### 5/5 — It does what it’s supposed to *2022-11-30* It’s an APP that will give you an estimate of whp, Set your parameters right and it will be close, not perfect but close. Again it’s an app not a real Dyno ### 2/5 — Adapt to other displays please *2022-10-04* I would say it’s okay. But the iPhone 12 Pro Max, as I have, has rounded corners and a notch above. Please adapt it more to this type of display. It’s a pain to use it. Many buttons close to the bottom border, triggering the „home button“ on those phones. Really looking weird to have options and buttons inside or nearby the notch. Please fix this. ### 1/5 — Support / Developer Vanished *2022-06-29* Don't purchase this app for now is my suggestion. The support and developer sites are now gone. So I cannot follow up with questions from prior contact BEFORE I bought Log Dyno. Hopefully support will return in the futures. ### 1/5 — Useless *2022-05-13* It simply doesn’t work. Save your money ### 1/5 — barely works *2021-12-22* works half the time i keep getting a error message ### 1/5 — Not ready for primetime *2021-09-05* Forces you to enter very specific car data every time you launch the app. The open CSV button launches a file browser that doesn’t show any of your actual files. Opening the app via tapping an MHD log file CSV from the iOS Files app, just displays an incompatible format error. Support is only provided via FB - I’m not setting up a FB account just to get support for an app. I want money back - this is just completely unusable! **Developer response:** There is literally a Contact Us button in the settings which is support via email. Also, only need to input car data ONCE, after that, the app saves the values. ### 1/5 — Useless *2021-01-24* This app is using time stamp and RPM to determine HP and TQ. It’s completely inaccurate. I am not sure what are the internal equations the developer intend to use, but in comparison to real life numbers, real Dynos and other similar apps, this one is grossly off. Don’t waste your time or money on it. **Developer response:** Usually when someone contacts me with an issue regarding a measurement it turned out in 100% of the cases to be a user error. I and plenty of other people have went on a dyno to confirm accuray, and measurements were spot on. I am confident in the app's performance, not so much in the dyno operators' which is in case the user. ## Frequently asked questions about Log Dyno ### How accurate is Log Dyno's measurement? Log Dyno's measurements are reported to be spot on when compared to real-life dyno sheets and with multiple different vehicles. Accuracy depends on correctly setting your vehicle data, such as weight, tire size, and drag coefficient. ### What datalog files can Log Dyno use? Log Dyno can use any CSV or MSL file containing RPM data. It specifically lists support for JB4, MHD, ProTool, COBB, MegaSquirt, and Bootmod3, among others. ### Can I compare different dyno runs with Log Dyno? Yes, you can save each of your dyno measurements and compare them interactively within the app. This allows for easy analysis of performance changes. ### What vehicle data does Log Dyno require? Log Dyno requires specific vehicle data for accurate measurements, including Car Name, Weight, Tank Capacity, Tire Size, DT%, Drag Coefficient, and Frontal Area. ### Does Log Dyno have ads? No, Log Dyno does not contain advertisements. It is a paid application. ### What power and torque units does Log Dyno support? Log Dyno supports various power units including WHP, BHP, PS, and KW. For torque, it supports LB-FT and NM, and can measure at the wheels or at the crank. ### What correction types are available in Log Dyno? Log Dyno offers several correction types for measurements, including Uncorrected, SAE J1349, STD, DIN 70020, and ISO 1585. ### How often is Log Dyno updated? The latest version of Log Dyno is 1.08.04, last updated on May 10, 2022. This indicates that updates are not very frequent. ## Version history (last 5 releases) ### 1.08.04 — 2022-05-10 -Added smoothing options 10, 20, 30, 40 -Lowered Log Data RPM minimum value to 1 from 10 These only mean more measurement adjustability ### 1.08.03 — 2021-01-26 Overall fixes. ### 1.08.00 — 2020-06-15 -Auto Weather fixes -Now CSV logs from GPS devices can be used, so now the app can calculate HP/TQ from speed too, previously the app only worked with RPM data, now it works with speed data. Make sure to only include a single gear pull part of your GPS log. Process with a log from an ECU is unchanged. -Tap on the CSV file even as an email attachment or from anywhere and the file will be directed to Log Dyno. ### 1.07.10 — 2020-02-07 -You can now define the minimum measurement RPM -Fuel type can now be selected at tank capacity (Gas/Diesel) ### 1.07.03 — 2019-07-13 -Added changeable order for saved measurements -Support for more log data formats -Bug Fixes ## Apps similar to Log Dyno | App | Rating | Price | Category | | --- | --- | --- | --- | | [Skeet25Pro](https://appshunter.io/ios/app/skeet25pro/id1443156860) | 2.7 (3) | Free | Sports | | [ESF](https://appshunter.io/ios/app/esf/id1441362200) | — | Free | Sports | | [Jetting Maxter KZ / ICC Kart](https://appshunter.io/ios/app/jetting-maxter-kz-icc-kart/id1476036840) | 5.0 (4) | $14.99 | Sports | | [WKGSIM](https://appshunter.io/ios/app/wkgsim/id1445976080) | — | Free | Sports | | [AICS FROSINONE](https://appshunter.io/ios/app/aics-frosinone/id1438674800) | — | Free | Sports | | [Microballistics](https://appshunter.io/ios/app/microballistics/id1467067380) | 2.3 (3) | Free | Sports | ## More apps by Adam Keninger - [Grey Cube - Endless Barrier Runner](https://appshunter.io/ios/app/grey-cube-endless-barrier-runner/id982204059) - [Real Drifting - Modified Car Drift and Race Lite](https://appshunter.io/ios/app/real-drifting-modified-car-drift-and-race-lite/id990247477) - [Drifting BMW Edition - Car Racing and Drift Race](https://appshunter.io/ios/app/drifting-bmw-edition-car-racing-and-drift-race/id1021237456) - [Toy Car Drifting : Car Racing Free](https://appshunter.io/ios/app/toy-car-drifting-car-racing-free/id1028380996) - [Drifting Lada Edition - Retro Car Drift and Race](https://appshunter.io/ios/app/drifting-lada-edition-retro-car-drift-and-race/id1044701079) - [Drifting BMW Edition 2 - Car Racing and Drift Race](https://appshunter.io/ios/app/drifting-bmw-edition-2-car-racing-and-drift-race/id1046979233) All apps by Adam Keninger: https://appshunter.io/developer/966549024 --- *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 2026-08-31.*