Engine RPM vs Slacker Virtual Remote
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Engine RPM
Analyze engine sound to calculate RPM using advanced signal processing. Ideal for engine setup and diagnostics, it supports various engine types and provides real-time feedback for accurate readings.
- Acoustic RPM measurement
- Engine sound analysis
- Supports 2-stroke/4-stroke engines
- Configurable cylinder count
- Real-time autocorrelation graph
- Adjustable update periods
- Low-pass filtering
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Measure the RPM of an engine by analyzing the sound it makes. Engine RPM listens to the sound of a running engine and uses advanced signal processing algorithms to extract the frequency of that sound and calculate the RPM. This app is primarily for setup and diagnostics of engines. After setting the the number of cylinders and whether the engine is a 2-stroke or 4-stroke engine, the app can work with any internal combustion engine, from diesel tractors to aircraft engines to motorcycles to chainsaws. To use the app you must set an expected RPM range to guide the analysis algorithms to the correct RPM. A real-time graph of the autocorrelation graph is displayed to help in troubleshooting and adjusting the expected RPM range. The analysis requires a clear sound from the engine without excessive interference from extraneous sounds. Do not expect to read the RPM of an engine while other things are making too much noise at the same time. The analysis also requires that the RPM be stable. It cannot read the RPM of an engine that is rapidly accelerating. For this reason, and because of the need for adjusting the expected RPM range, this app should not be considered a drop-in replacement for an operational tachometer. Setup options include update periods from 93 milliseconds to 1.5 seconds, one to 12 cylinders, 2-stroke or 4-stroke, low-pass filtering, and signal clipping. The overall RPM range is 400 to 90,000 RPM (although at any one time, the operational range is typically +/- 30% around a nominal expected RPM). Precision is usually about +/- 10 RPM.
Slacker Virtual Remote
Transform your smartphone into a remote display for a digital suspension tuner. View real-time measurements and control device functions like reset and auto-zero. This version offers core remote capabilities without saving settings.
- Remote display for suspension tuner
- Real-time measurement viewing
- Control reset function
- Control auto-zero function
- Bluetooth connectivity
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Slacker Virtual Remote allows you to use your smartphone as a remote display for the new Motool Slacker Digital Suspension Tuner V4 with Bluetooth®. Take real-time measurements, measurements and control Slacker with the Reset and Auto Zero buttons. This is a "light" version of the virtual remote in the Motool Service Assistant App, you can not save settings. For virtual remote with MTB Mode and to save bikes and settings, install Service Assistant.
Screenshots
Verdict
The clearest difference is review sentiment: Slacker Virtual Remote at 100% against Engine RPM's 48%. Slacker Virtual Remote also leads on price (Free vs $8.99) and rating (5.0 vs 4.0). Engine RPM's advantage is ratings volume (35 vs 2). On ads, in-app purchases, monetization model and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Slacker Virtual Remote is free to download; Engine RPM costs $8.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Slacker Virtual Remote holds the better App Store score, 5.0 against 4.0. That said, the two scores are not equally well evidenced: Engine RPM has 35 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 48% of Engine RPM's written reviews are positive against 100% of Slacker Virtual Remote's.
Engine RPM ships an update every 26 months, Slacker Virtual Remote every 6 months. The most recent releases landed on September 19, 2026 and September 16, 2026 respectively.
| Parameter | Engine RPM | Slacker Virtual Remote |
|---|---|---|
| Price | $8.99 | Free — better |
| Rating | 4.0 (35 ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 48.4% of reviews | 100.0% of reviews — better |
| Number of ratings | 35 — better | 2 |
| Update frequency | Every 26 months | Every 6 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 13.0 | 12.1 — better |
| Further details — not scored | ||
| Size | 3 MB | 27 MB |
| Age rating | 4+ | 4+ |
| Developer | Real-Time Specialties | Motool Inc |
Customer experience
Engine RPM
Slacker Virtual Remote
In-app purchases
Engine RPM
No in-app purchases
Slacker Virtual Remote
No in-app purchases
Questions
Is Engine RPM free?
Is Slacker Virtual Remote free?
Which has better reviews, Engine RPM or Slacker Virtual Remote?
Do Engine RPM or Slacker Virtual Remote have ads?
Which is updated more often, Engine RPM or Slacker Virtual Remote?
Other comparisons
