# Motor Load > Measures electric motor RPM and load percentage from sound or vibration. (iPhone/iPad app by Real-Time Specialties.) - Source: https://appshunter.io/ios/app/motor-load/id863286811 (this page in markdown: same URL + `.md`) - Developer: [Real-Time Specialties](https://appshunter.io/developer/335568332) - Category: Utilities, Productivity - Price: $4.99 - Rating: 5.00/5 from 1 App Store ratings · 1 written reviews indexed - Age rating: 4+ - Requires: iOS 8.0 · 5 MB - Languages: American English - Released: 2014-06-15 - Data updated: 2026-06-10 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/motor-load/id863286811/reviews.md ## What is Motor Load? This app detects the RPM of an electric motor based on the sound or vibration it makes, and from the RPM it calculates the percent of full load on the motor. This app does not work with all electric motors. This app only works if the motor is making a clear tonal sound or vibration whose pitch is related to the speed of the motor. It will not work if the sound is atonal or masked by too much noise. Please download the manual from our support website www.tunelab-world.com/motorload to understand the limitations of this app before buying it. There is also a video showing how it works. Although valid results may sometimes be obtained with the built-in microphone in iOS devices, in some cases better results can be obtained with an external contact microphone, such as the ones used to tune guitars in a noisy environment. By clipping a contact microphone somewhere on the motor the vibrations from the motor can be sensed directly with less noise. Monitoring the RPM of a motor over time can be a useful preventative maintenance tool for motors used in critical industrial applications. AC induction motors run at a speed somewhat below their synchronous speed. The degree of slippage from synchronous speed depends on the mechanical loading of that motor. When the loading increases, this app can detect the slight drop in motor speed and indicate when loading is increasing. ## Key features - Detects motor RPM from sound/vibration - Calculates percent of full load - Preventative maintenance tool - Works with tonal sounds/vibrations - Supports external contact microphones ## Recent user reviews (1 of 1) All indexed reviews: https://appshunter.io/ios/app/motor-load/id863286811/reviews.md ### 5/5 — INSANELY precise app. *2018-04-07* This app is AWESOME. I am not even measuring an induction motor. As long as your motor makes a clear tonal sound, and you adjust the settings according to the known specs of your motor, you will get an EXTREMELY precise measurement. I do have a tachometer and just wanted to see if this app worked. The reading I got off of this app was less than 5 RPM off of the reading on my tachometer. This app is perfect. The “load” setting needs a bit of work though. I Use this every day! ## Frequently asked questions about Motor Load ### What is Motor Load? Motor Load is a utility app designed to detect the RPM of electric motors by analyzing their sound or vibration. From the detected RPM, it calculates the percentage of full load on the motor, serving as a preventative maintenance tool. ### How accurate is Motor Load? The accuracy of Motor Load depends on the motor producing a clear tonal sound or vibration. It may not work with atonal sounds or if the sound is masked by excessive noise. External contact microphones can improve accuracy by directly sensing vibrations. ### What are the limitations of Motor Load? Motor Load does not work with all electric motors. It requires a clear, tonal sound or vibration related to motor speed. Users are advised to download the manual from the support website to understand these limitations before purchasing. ### What devices does Motor Load support? Motor Load is available for iPhone and iPod devices. It was last updated on January 9, 2018, with version 1.1. ### How much does Motor Load cost? Motor Load is a paid application, priced at $4.99. There are no in-app purchases or subscriptions mentioned for this utility. ### Does Motor Load have ads? No, Motor Load does not contain advertisements. As a paid application, it offers an ad-free experience for users. ### What is the age rating for Motor Load? Motor Load has an age rating of 4+, making it suitable for a wide range of users, including younger individuals who may be assisting in industrial settings. ### Can Motor Load be used for preventative maintenance? Yes, monitoring the RPM of a motor over time with Motor Load can be a useful preventative maintenance tool, especially for motors in critical industrial applications. It helps detect increasing load by noting slight drops in motor speed. ## Version history (last 2 releases) ### 1.1 — 2018-01-09 This app has been updated by Apple to display the Apple Watch app icon. * iOS sound compatibility issue fixed. * Configuration for harmonics of motor sound added. * Signal analysis algorithm improvement for higher accuracy in RPM measurements. * Improved help pages. ### 1.0 — 2014-06-12 No release notes. ## More apps by Real-Time Specialties - [TuneLab Piano Tuner](https://appshunter.io/ios/app/tunelab-piano-tuner/id335568329) - [Engine RPM](https://appshunter.io/ios/app/engine-rpm/id340401811) - [Organ Tuner](https://appshunter.io/ios/app/organ-tuner/id393104842) - [Montal Tuner](https://appshunter.io/ios/app/montal-tuner/id834742359) - [Audio Narrowband Filter](https://appshunter.io/ios/app/audio-narrowband-filter/id6748972323) All apps by Real-Time Specialties: https://appshunter.io/developer/335568332 --- *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 2026-06-10.*