# Strobe Light Tachometer

> iPhone strobe light and tachometer for measuring rotating object speeds. (iPhone/iPad app by Motionics LLC.)

- Source: https://appshunter.io/ios/app/strobe-light-tachometer/id978182913 (this page in markdown: same URL + `.md`)
- Developer: [Motionics LLC](https://appshunter.io/developer/424498959)
- Category: Productivity, Utilities
- Price: Free
- Rating: 4.20/5 from 276 App Store ratings · 76 written reviews indexed
- Age rating: 4+
- Requires: iOS 7.0 · 4 MB
- Languages: American English, Arabic, Catalan, Czech, Danish, Dutch, Finnish, French (France), German (Germany), Greek and 21 more
- Released: 2015-03-30
- Data updated: 2026-08-31
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/strobe-light-tachometer/id978182913/reviews.md

## What is Strobe Light Tachometer?

NOTE: 
The App is just for iPhone with flashlight. It doe NOT work on iPad, iPod touch or any iOS device without flashlight.

Description:
Using this App, you can control the flashing on/off speed of your phone flashlight between 1Hz to 130Hz. In another word, this App makes your iPhone into a strobe light.

What's the Application then?!
You can use this App to use your iPhone as a tachometer that measures the speed of any rotating object. 

How to use it?
Suppose you have a fan and need to measure its speed (RPM). Turn on the fan in a DARK environment, launch the App on your iPhone (that has flashlight). Manually tune the speed using the main slider of the App to see the rotating object looks almost not moving. Then, start fine tuning using the three buttons in the App to get the exact speed. At this point the rotating object looks like stationary! But, it is moving! So, never touch the moving/rotating object during your test!

Features:
- Slider to adjust strobe light speed between 1-130Hz (60-7800RPM)
- x2 and ÷2 buttons for quick adjustment of flashing speed
- 3 Buttons for fine tuning of the speed up to 2 decimal: 0X.00, 00.X0, 00.0X
- Textfield to manually enter the speed in RPM (tap on the speed label)
- Button for light and dark background option
- showing the speed in both Hz and RPM
- simple and easy to use!!

## Key features

- Adjustable strobe speed (1-130Hz / 60-7800RPM)
- Quick adjustment buttons (x2, ÷2)
- Fine-tuning buttons for precise speed
- Manual RPM input
- Display speed in Hz and RPM
- Light/dark background option

## What do users think of Strobe Light Tachometer?

Overall sentiment: mixed

**Pros**

- ✅ Accurate frequency and RPM measurements
- 👍 Simple and user-friendly interface
- 🎓 Excellent educational tool for teaching frequency concepts
- 💰 Free application
- ⚡ Quick and easy to use, even one-handed
- 🎯 Effective for checking turntable, lathe, and fan speeds
- 📱 Works well on most iPhone models
- 🔧 Useful for professional HVAC and mechanical applications

**Cons**

- 💡 LED flash brightness is too dim
- 🐛 Strobe light cuts out or blacks out intermittently
- 🐛 Inconsistent and erratic flashing patterns
- ⚠️ Hardware compatibility issues with older iPhone models
- 🐛 Strobe stops working after extended use
- 📺 Ads in the control interface
- 🔌 LED flash may not be at maximum brightness setting
- 🌞 Difficult to see in bright daylight conditions

**Commonly reported bugs**

- Strobe light cuts out every 2-3 seconds then resumes
- LED flashes erratically on certain iPhone models (iPhone 14, iPhone XS, iPhone SE)
- Strobe pulse is inconsistent and misses beats
- App crashes or stops working after 20-30 minutes
- Requires manual LED activation before starting strobe
- Incompatibility error message on iPhone devices
- Strobe accuracy degrades at higher frequencies (above 45 Hz)
- Flash pulses vary in length and brightness at high frequencies
- App shows "only compatible with iPhone" error on iPhone devices

**Most requested features**

- Ability to adjust brightness while strobe is running
- Display accuracy specifications and hardware limitations
- Option to set frequency by Hz in addition to RPM
- Ability to specify number of fan blades for accurate RPM calculation
- 2x and 1/2x multiplier options
- Reduced or removed advertisements
- Display maximum blink rate for device hardware

## Recent user reviews (10 of 76)

All indexed reviews: https://appshunter.io/ios/app/strobe-light-tachometer/id978182913/reviews.md

### 2/5 — Brightness

*2026-04-13, version 1.1*

The flash is not bright enough to be useful.

### 1/5 — Broken

*2026-04-05, version 1.1*

This app no longer works.

### 1/5 — Ok

*2026-04-02*

Don’t get how you are suppose to use it

### 1/5 — Cannot hold a steady strobe light; constantly cuts out.

*2025-12-03, version 1.1*

Very disappointed in this flawed app.  The strobe light, although accurate in speed, cannot hold its light and blacks out every 2 seconds.  Useless.

### 5/5 — Awesome teaching tool!

*2025-04-03*

The metrics (frequency and RPM) bring awesome demonstration to ceiling fans, house fans, guitar strings, water streams!  Visual perception is so interesting as inspired by frame rates.

### 2/5 — Erratic

*2025-01-21*

On my iPhone 14 the strobe light is very erratic.

### 3/5 — Works, but dimly

*2024-04-13, version 1.1*

Does the job, but doesn’t set the flash to full brightness.

### 5/5 — Technical Service Manager-HVAC OEM

*2024-01-20*

This app works very well and is very accurate!  Very easy and quick to use, even one handed!

### 5/5 — .

*2023-10-21, version 1.1*

Unbelieavble saved my project

                         -Sincerely 
                                          LeBron James

### 5/5 — Perfect Strobe for Zoetropes

*2023-07-23*

Outstanding app.  Very accurate strobe for timing the frame rates for zoetropes.  The flashes are clean also, which gives crisp animations.

I actually like how the flash is not overly bright — this shields my zoetrope animations from over exposure.

I am stunned that this superb app is free.  I will check the author’s web page to see if there is a option to submit a donation.

## Frequently asked questions about Strobe Light Tachometer

### What does the Strobe Light Tachometer app do?

This app transforms your iPhone into a strobe light and a tachometer. You can control the flashing speed of your phone's flashlight from 1Hz to 130Hz. This allows you to measure the rotational speed (RPM) of objects by making them appear stationary when viewed under the flashing light.

### How do I use the app to measure RPM?

In a dark environment, turn on the object you want to measure (e.g., a fan). Launch the app and manually adjust the strobe speed using the main slider until the object appears almost still. Then, use the fine-tuning buttons for exact speed adjustment. The app will display the speed in both Hz and RPM.

### Is this app compatible with all iOS devices?

No, this app is specifically designed for iPhones that have a flashlight. It will not function on iPads, iPod touches, or any other iOS devices that lack a built-in flashlight.

### What are the key features of the app?

Key features include a slider for adjusting strobe speed between 1-130Hz (60-7800RPM), quick adjustment buttons (x2, ÷2), fine-tuning buttons for precision up to two decimal places, manual RPM input, a background theme option, and display of speed in both Hz and RPM.

### Is the app free to use?

Yes, the app is free to download and use. It does not contain any in-app purchases or advertisements, offering a straightforward and uninterrupted experience.

## Version history (last 2 releases)

### 1.1 — 2015-10-28

This app has been updated by Apple to display the Apple Watch app icon.

- Added quick RPM adjustment of x2 and ÷2
- Changed manual input to RPM

### 1.0 — 2015-03-29

No release notes.

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## More apps by Motionics LLC

- [iWindTurbine](https://appshunter.io/ios/app/iwindturbine/id424498956)
- [iRotorBalance](https://appshunter.io/ios/app/irotorbalance/id430978753)
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- [VibraUnits](https://appshunter.io/ios/app/vibraunits/id445231670)
- [REBvibe](https://appshunter.io/ios/app/rebvibe/id445515440)
- [VibeSpectra](https://appshunter.io/ios/app/vibespectra/id448014799)

All apps by Motionics LLC: https://appshunter.io/developer/424498959

## Related topics

[strobe light tachometer](https://appshunter.io/ios/topics/strobe-light-tachometer) · [timing light](https://appshunter.io/ios/topics/timing-light) · [strobe light rpm](https://appshunter.io/ios/topics/strobe-light-rpm) · [strobe light hz](https://appshunter.io/ios/topics/strobe-light-hz) · [strobe tachometer](https://appshunter.io/ios/topics/strobe-tachometer) · [rpm strobe](https://appshunter.io/ios/topics/rpm-strobe) · [zoetrope strobe](https://appshunter.io/ios/topics/zoetrope-strobe) · [strobe](https://appshunter.io/ios/topics/strobe) · [strobe light](https://appshunter.io/ios/topics/strobe-light) · [tachometer rpm](https://appshunter.io/ios/topics/tachometer-rpm) · [strobe light free](https://appshunter.io/ios/topics/strobe-light-free) · [tachometer digital](https://appshunter.io/ios/topics/tachometer-digital) · [ligth strob](https://appshunter.io/ios/topics/ligth-strob)

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*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.*