# Engine RPM vs Strobe Light

The clearest difference is review sentiment: Engine RPM at 48% against Strobe Light's 0%. Engine RPM also leads on rating (4.0 vs 2.0) and in-app purchases (none vs 2). Strobe Light's advantage is price (Free vs $8.99) and update cadence (every 7 months vs every 16 months). On device support there is nothing between them.

Strobe Light is free to download; Engine RPM costs $8.99 up front. Strobe Light sells 2 in-app purchases, starting at $5.99 per month. Engine RPM asks for nothing beyond the download.

Engine RPM holds the better App Store score, 4.0 against 2.0. That said, the two scores are not equally well evidenced: Engine RPM has 35 ratings behind it against 1, 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 0% of Strobe Light's.

Engine RPM ships an update every 16 months, Strobe Light every 7 months. The most recent releases landed on November 6, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Engine RPM | Strobe Light |
| --- | --- | --- |
| Price | $8.99 | **Free** |
| Rating | **[4.0 (35 ratings)](https://appshunter.io/ios/app/engine-rpm/id340401811/reviews)** | [2.0 (1 ratings)](https://appshunter.io/ios/app/strobe-light-rpm/id6747579407/reviews) |
| Number of ratings | **35** | 1 |
| Positive reviews | **47.7% of reviews** | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 16 months | **Every 7 months** |
| Monetization | **Free** | Ad-supported |
| Size | 3 MB | 25 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Real-Time Specialties](https://appshunter.io/developer/335568332) | [Zain Saeed Mughal](https://appshunter.io/developer/1762408320) |

## What reviewers say

### Engine RPM

[App page](https://appshunter.io/ios/app/engine-rpm/id340401811)

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.

**Highlights:** 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

**Features:** Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 💰 Saves money vs. dedicated tachometer
- 🛠️ Useful for engine tuning/diagnostics
- ✅ Works well with correct settings
- 🏎️ Accurate for steady RPMs
- 💡 Ingenious app concept

**What reviewers complain about**

- 📉 Inaccurate or unreliable readings
- ❓ Difficult to configure/use
- 💸 Waste of money (for many)
- 😵 Confusing interface/settings
- ⚡ Not good for rapidly changing RPMs

**Reported bugs**

- Does not register live RPM readings
- Displays incorrect or random numbers
- App opens then closes immediately
- Blank display or flashes incorrect data intermittently
- Cannot get consistent readings

**Requested features**

- Save configuration settings
- Option to display cycle/cylinder count on home screen
- Improved response time for transient surges
- Simplified or automated setup process
- Auto-scaling graphical display for easier harmonic matching


### Strobe Light

[App page](https://appshunter.io/ios/app/strobe-light-rpm/id6747579407)

This application transforms your smartphone into a digital tachometer using its flashlight. It measures the rotational speed (RPM) of objects by flashing light at them, making them appear stationary when the flash rate matches their speed. Save readings and use it for mechanics, education, or industrial checks.

**Highlights:** Measures RPM of rotating objects, Adjustable strobe speed (1-10,000 RPM), Quick adjustment buttons (+/- increments), Flash sync for accuracy, Save and review RPM data, Works in low light conditions

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $5.99 | per month |
| Remove Ads | $4.99 | one-time |


## Frequently asked questions

### Is Engine RPM free?

Engine RPM costs $8.99, with no in-app purchases.

### Is Strobe Light free?

Strobe Light is free to download, with in-app purchases available.

### Which has better reviews, Engine RPM or Strobe Light?

Engine RPM is rated higher. Engine RPM averages 4.0 out of 5 from 35 ratings, while Strobe Light averages 2.0 from 1 ratings.

### Do Engine RPM or Strobe Light have ads?

Strobe Light shows ads; Engine RPM does not.

### Which is updated more often, Engine RPM or Strobe Light?

Engine RPM ships an update every 16 months, and Strobe Light every 7 months. Most recently, Engine RPM was updated on November 6, 2026 and Strobe Light on October 31, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*