# Strobe tachometer (RPM meter) — + Laser Tachometer + Magnetic

> App measures rotational speed using strobe, laser, or magnetic tachometer functions. (iPhone/iPad app by Dmitriy Kharutskiy.)

- Source: https://appshunter.io/ios/app/strobe-tachometer-rpm-meter/id831460940 (this page in markdown: same URL + `.md`)
- Developer: [Dmitriy Kharutskiy](https://appshunter.io/developer/817385891)
- Category: Utilities, Entertainment
- Price: Free with in-app purchases
- Rating: 4.30/5 from 83 App Store ratings · 100 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.6 · 16 MB
- Languages: American English, Czech, Dutch, French (France), German (Germany), Italian, Japanese, Brazilian Portuguese, Russian, European Spanish and 1 more
- Released: 2014-03-13
- Data updated: 2026-08-28
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/strobe-tachometer-rpm-meter/id831460940/reviews.md

## What is Strobe tachometer (RPM meter)?

STROBE TACHOMETER
When the flicker frequency of light coincides with the speed of any object, such as a fan, the rotating fan may appear to be stationary. Changing the frequency of the flicker of light may help detect the rotation speed.

You may easily use the flicker frequency control buttons to quickly assign the flicker frequency with an accuracy of 0.0001 Hz (0.01 RPM):

• Up to 1000 Hz (60 000 RPM) for a connected flashlight (see the video on YouTube: https://youtu.be/iq6Xiums05o).
• Up to 100 Hz (6000 RPM) for the iPhone flashlight.

IF THE SPEED IS MORE THAN UPPER LIMIT, YOU MAY STILL DETERMINE THE SPEED BY FIRST MAKING MEASUREMENTS WITH A LOWER FLICKER FREQUENCY AND THEN MAKING A SIMPLE CALCULATION (AS EXPLAINED IN THE APPENDIX).

To change the frequency, you should simply press and hold the button. In the app settings, you can adjust the speed at which the flash rate changes when you press and hold the button. The flicker frequency can be displayed either in Hz or RPM.

The image you see will be sharper in lower external light.

After a long period of usage, in case of overheating, the iPhone flashlight turns off automatically.

LASER TACHOMETER
• Measurement range from 0.3 Hz (18 RPM) to 1000 Hz (60 000 RPM).
• Step 0.01-0.0001 Hz (1-0.01 RPM).
• Update time 1 sec.
• 5 mW laser power required.

MAGNETIC TACHOMETER
This tachometer operates by measuring the magnetic field from a spinning magnet. The magnetic field is measured by the iPhone's magnetometer. The magnetic tachometer is best suited for measuring low rotation speeds (from 6 revolutions per minute). It can also be used for measuring medium rotation speeds (up to 2,700 RPM), but at such speeds there is a risk of spontaneous tearing away of the magnet and strong vibration due to center-of-gravity shift.

• Measurement range from 0.1 Hz (6 RPM) to 45 Hz (2,700 RPM).
• Step 0.2-2 %.
• Update time 2-5 sec.

## Key features

- Strobe tachometer function
- Laser tachometer mode
- Magnetic tachometer mode
- Adjustable flicker frequency
- RPM and Hz display
- High precision measurement

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Full version of the stroboscopic tachometer | $2.99 | one-time |
| Laser Tachometer and Magnetic | $2.99 | one-time |


## Recent user reviews (10 of 100)

All indexed reviews: https://appshunter.io/ios/app/strobe-tachometer-rpm-meter/id831460940/reviews.md

### 2/5 — Has some issues

*2026-05-11, version 3.6.6*

Doesn’t seem to use the full brightness of the iPhone, even with the paid features unlocked and the higher brightness setting on. Frequency doesn’t seem entirely accurate either.

### 5/5 — Love it so paid for it

*2026-03-30, version 3.6.6*

This was exactly the app I was looking for to create a strobe light effect to set up my turntable. The free version is actually fine, but I liked it enough that I felt I should pay for it. All the other strobe apps I tried were awful in comparison.

### 5/5 — Strobe Tach

*2026-02-21, version 3.6.6*

Excellent Tachometer

### 5/5 — Будем изучать и пробовать.

*2026-02-01*

Пока осваиваю

### 5/5 — カセットデッキの速度調整

*2025-09-20*

テープスピードを4.76cm/sに合わせた時、モーターの回転数が何回転になるかを調べる方法を試行錯誤した結果ストロボスコープが有れば良いとの結論に達しiPhoneのアプリを検索して辿り着きました。
キャプスタンとプーリーの直径から割り出した値と照らし合わせ実効径が導き出されました。
モーター制御回路のシミュレーションに導入することが最終目的。

### 5/5 — Does what it says.

*2025-04-28, version 3.6.3*

Found the rpm of a fan. Had to play wound a bit to work out how it works but it does work the way the video tutorial says.

### 5/5 — Turntable Strobe Disc

*2025-03-05, version 3.6.3*

I bought a cheap stroboscopic disc to use with my record turntable not realising that I need a strobe light. The disc works at 50 Hz so I set this little light for 50 Hz and it works perfectly without upgrading to the paid version. Impressive!

### 3/5 — Inconsistent RPM

*2024-12-27, version 3.6.3*

I use the iphone flashlight but there is an inconsistent RPM where the flicker will stop for every second and then flash a steady light

### 5/5 — Tattoo Machine Necessity

*2024-10-05, version 3.6.3*

I’m a professional Tattoo Artist and I use this app to know the speed of my machine. Absolutely a wonderful tool to have!

### 5/5 — Отлично

*2024-08-10*

В примитивной бесплатной версии работает , что хотел узнать ,узнал,спасибо.

## Frequently asked questions about Strobe tachometer (RPM meter)

### What does the Strobe Tachometer app do?

This app allows you to measure the rotational speed of objects using your phone's built-in flashlight as a strobe, or by utilizing a laser or the phone's magnetic sensor. It helps you determine RPMs by synchronizing light flicker frequency with object rotation.

### What are the different measurement modes available?

The app offers three primary modes: a strobe tachometer that uses the phone's flashlight, a laser tachometer for more precise measurements (requires external laser), and a magnetic tachometer that uses the phone's magnetometer to detect spinning magnets.

### How accurate are the measurements?

The strobe tachometer offers high precision with an accuracy of 0.0001 Hz (0.01 RPM). The laser tachometer also provides precise measurements, while the magnetic tachometer is best suited for lower speeds with a measurement step of 0.2-2%.

### What is the measurement range for each mode?

The strobe tachometer can measure up to 60,000 RPM with an external flashlight and up to 6,000 RPM with the iPhone flashlight. The laser tachometer ranges from 18 RPM to 60,000 RPM, and the magnetic tachometer measures from 6 RPM to 2,700 RPM.

### Is this app free to use?

The app is free to download and use with its core functionalities. However, it offers in-app purchases, which may unlock additional features or enhance the measurement capabilities.

## Version history (last 5 releases)

### 3.6.7 — 2026-08-26

The app has been updated only to answer new age rating questions.

### 3.6.6 — 2026-02-15

• Bug fixes.

### 3.6.5 — 2025-10-31

• Minor changes in text design.

### 3.6.4 — 2025-04-28

• Small improvements.

### 3.6.3 — 2023-09-10

• Minor changes in text design.

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## More apps by Dmitriy Kharutskiy

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- [DIY Anemometer (Wind Meter)](https://appshunter.io/ios/app/diy-anemometer-wind-meter/id1313709233)
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All apps by Dmitriy Kharutskiy: https://appshunter.io/developer/817385891

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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 2026-08-28.*