Very handy!
I have been using a Miniature Aircraft Xcell tachometer for years. This allows me to use my phone (and this app!) so I have a optical tach wherever I go now. Thanks to the dev! The accuracy is spot on. Recommended.
Video tachometer
Strobe light effect, RPM meter
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Description
When the frame rate of a video matches the speed of a particular part, the effect is the same as using a strobe light. In the video, that part freezes.
Since the frame rate of a video can be adjusted, this effect can be used to determine the rotational speed of a part.
The smartphone must support slow-motion video recording (filming at a high frame rate). This is the case for all smartphones starting with iPhone 5S. The range is as follows:
• 0.5—240 Hz (30—14400 RPM), for all phones from iPhone 6 onward
• 0.5—120 Hz (30—7200 RPM), for iPhone 5S
THE HERTZ (Hz) VALUE IS MORE ACCURATE THAN THE REVOLUTIONS PER MINUTE (RPM) VALUE, SINCE REVOLUTIONS PER MINUTE ARE CALCULATED FROM HERTZ AND ROUNDING IS DONE.
To get a clear image, good lighting is important. The clarity of the image is controlled by the exposure of the video (exposure time and light sensitivity (ISO)). If the exposure time is reduced, the image will increase in clarity, but brightness will lower. To increase the brightness, you need to raise the camera's light sensitivity (ISO), but then the amount of noise increases. You also need to manually adjust the focus of the camera.
The app can record video. The video format depends on the selected format in the app settings. If your iPhone supports 4K video format (3840x2160), then you can record 4K video at the frame rate supported by your iPhone. Text with important information is added to the frames of the recorded video: the selected frame rate, exposure duration, ISO, time stamp, time difference between the current and previous frames (Tcurr. − Tprev.), the sequence number of the frame in the recorded video. If you want any other information to be added, then let me know.
You can choose to add only part of this information, and you can choose a different text color. You also have the option of not adding any information. You can change the information that is added and the color of the text while recording a video. At high frame rates, frames that do not have time to be processed may be discarded. This does not affect subsequent frames and can be controlled using the time difference between the current frame and the previous frame (Tcurr. − Tprev.). Dropping frames affects the video frame rate displayed in the "Photos" app. But the time interval between frames that were taken one after another and were not discarded will correspond to the selected frame rate. Frames may be dropped even when shooting slow motion video using the "Camera" app. You can check this by looking at the frame rate for slow motion video in the "Photos" app.
Video containing the app's interface can be captured using the iOS "Screen Recording" function.
To take a photo with the result of the measurement written on it, press the "Pause" button and take a screenshot.
It is possible to choose a video format that has the best quality, but has a significantly lower maximum frame rate. The difference between the formats is clearly visible only when using the digital zoom. Also, when using a format with better quality, the Rolling Shutter effect is stronger. Therefore, the best quality format can be used at speeds less than about 1000 rpm.
You can turn on hints for easier observation of changes in rotation speed. Hints show how to change the frame rate (decrease or increase) depending on the direction of rotation of the mark. The hints are selected manually, but then you do not need to remember this information. The hints are relevant for frequencies close to the rotation frequency. If the direction of rotation of the impeller is known, hints can be selected in advance. The arrow showing the direction of rotation of the impeller must correspond to the "+" button.
The video tachometer measures the rotational speed in exactly the same way a stroboscopic tachometer would.
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Since the frame rate of a video can be adjusted, this effect can be used to determine the rotational speed of a part.
The smartphone must support slow-motion video recording (filming at a high frame rate). This is the case for all smartphones starting with iPhone 5S. The range is as follows:
• 0.5—240 Hz (30—14400 RPM), for all phones from iPhone 6 onward
• 0.5—120 Hz (30—7200 RPM), for iPhone 5S
THE HERTZ (Hz) VALUE IS MORE ACCURATE THAN THE REVOLUTIONS PER MINUTE (RPM) VALUE, SINCE REVOLUTIONS PER MINUTE ARE CALCULATED FROM HERTZ AND ROUNDING IS DONE.
To get a clear image, good lighting is important. The clarity of the image is controlled by the exposure of the video (exposure time and light sensitivity (ISO)). If the exposure time is reduced, the image will increase in clarity, but brightness will lower. To increase the brightness, you need to raise the camera's light sensitivity (ISO), but then the amount of noise increases. You also need to manually adjust the focus of the camera.
The app can record video. The video format depends on the selected format in the app settings. If your iPhone supports 4K video format (3840x2160), then you can record 4K video at the frame rate supported by your iPhone. Text with important information is added to the frames of the recorded video: the selected frame rate, exposure duration, ISO, time stamp, time difference between the current and previous frames (Tcurr. − Tprev.), the sequence number of the frame in the recorded video. If you want any other information to be added, then let me know.
You can choose to add only part of this information, and you can choose a different text color. You also have the option of not adding any information. You can change the information that is added and the color of the text while recording a video. At high frame rates, frames that do not have time to be processed may be discarded. This does not affect subsequent frames and can be controlled using the time difference between the current frame and the previous frame (Tcurr. − Tprev.). Dropping frames affects the video frame rate displayed in the "Photos" app. But the time interval between frames that were taken one after another and were not discarded will correspond to the selected frame rate. Frames may be dropped even when shooting slow motion video using the "Camera" app. You can check this by looking at the frame rate for slow motion video in the "Photos" app.
Video containing the app's interface can be captured using the iOS "Screen Recording" function.
To take a photo with the result of the measurement written on it, press the "Pause" button and take a screenshot.
It is possible to choose a video format that has the best quality, but has a significantly lower maximum frame rate. The difference between the formats is clearly visible only when using the digital zoom. Also, when using a format with better quality, the Rolling Shutter effect is stronger. Therefore, the best quality format can be used at speeds less than about 1000 rpm.
You can turn on hints for easier observation of changes in rotation speed. Hints show how to change the frame rate (decrease or increase) depending on the direction of rotation of the mark. The hints are selected manually, but then you do not need to remember this information. The hints are relevant for frequencies close to the rotation frequency. If the direction of rotation of the impeller is known, hints can be selected in advance. The arrow showing the direction of rotation of the impeller must correspond to the "+" button.
The video tachometer measures the rotational speed in exactly the same way a stroboscopic tachometer would.
In-Apps
- Full version
- $2.99
Screenshots
User Rating
4.65 out of 5
63 ratings in United States
5 star
52
4 star
7
3 star
0
2 star
1
1 star
3
Ratings History
Reviews
Great!
Excellent little app. Open and it works perfectly. I’m building a DC motor with grandkids for their science fair project. I wanted to show them how RPM changes with voltage input. I upgraded to the full version, not because I need that precision and may never use it again, but it was only about 10% the cost of the cheapest stand alone tach. Thanks to the developer for making this so accessible. 👍
WHAT A JOKE!!
It didn’t read anything and every button you tap a pop up jumps in and says you need to pay for an upgrade to get that function. Dude, here’s some advice, if you’re only building an app to gather/sell info on your users at least build an app that actually functions because you’ll never get enough users to make you rich selling their personal info with this bogus app 🤦♂️
Great value. Thanks for being awesome.
I like this better than all the other apps for measuring turntable RPM (using a strobe disc on the turntable)
No Video Recording
The app works but without the ability to capture video it’s not very useful. Sure, the developer says to use the iPhones build-in in screen capture but then the interface is in the video. This would be a 5 star app if it had the ability to capture video. Until that happens I can only give it 1 star.
fantastic app
Manual controls over everything: exposure time, light sensitivity (ISO), focus (auto or manual), RPM… and that's in the free version!
Farmers Friend
I’m a farmer that irrigates with natural gas engines, some with, some without tachs. It’s great to pull up to a motor and see what rpm the drivelines are spinning or the gearhead. Most of the time my phone is in my pocket. Can’t say that about the older expensive tachs I was carrying.
Genius!
Wow! Nicely done. Thank-you. Very clever approach, great application!
Very Helpful
I acquired an old Snapper riding lawnmower that was reving very high until I adjusted the governor down. I wanted to verify the engine RPM was in a good spot, so I thought about the Tachometer RPM testers I use at work and started wondering if my iPhone camera could check RPM. Sure enough I found this! This app helped confirm that the old powerful little engine was running at the factory rating of 3300 RPM. I was very impressed by the app and how easy it was to use. Wish I could download it for the first time again. 5 stars
Classic VW Beetle
Worked perfectly for timing my classic beetle!
Store Rankings
Ranking History
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Category Rankings
App is not ranked yet
Keywords
rpm-lite,
engine rpm,
rpm,
stroboscope,
timing light,
rpm app,
turntable speed,
rpm meter,
strobe light tachometer,
rpm calculator
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App Info
- Category
- Utilities
- Publisher
- Dmitriy Kharutskiy
- Languages
- English, Czech, Dutch, French, German, Italian, Japanese, Portuguese, Russian, Spanish, Swedish
- Recent version
- 2.1 (1 month ago )
- Released on
- Dec 28, 2019 (4 years ago )
- Also available in
- United States, Russia, United Kingdom, Australia, Germany, Canada, Japan, Turkey, France, Vietnam, Pakistan, New Zealand, Norway, Saudi Arabia, Sweden, Netherlands, Czechia, Colombia, Brazil, Mexico, Egypt, United Arab Emirates, Italy, Malaysia, Portugal, Singapore, Austria, Peru, Philippines, Romania, Israel, South Africa, Spain, Argentina, Belgium, Switzerland, Chile, Denmark, Dominican Republic, Algeria, Ecuador, Nigeria, Finland, Greece, Hungary, Ireland, South Korea, Kuwait, Lebanon
- Last updated
- 1 month ago