Video tachometer vs Flowserve FlowSync
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Video tachometer
This app uses slow-motion video to create a strobe light effect, allowing you to measure rotational speeds. It records video with detailed information like frame rate and exposure, and offers customizable text overlays.
- Strobe light effect simulation
- Rotational speed measurement (RPM/Hz)
- Slow-motion video recording
- Customizable text overlays on video
- Adjustable frame rate and exposure
- Records 4K video (if supported)
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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. The app can take a photo with the measurement result, date, and time written on the photo. The exposure time and ISO settings will be saved in the photo's metadata. To take a photo that shows the app interface, tap 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 2000 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.
Flowserve FlowSync
Control and monitor MXb Smart Actuators remotely via Bluetooth from an iOS tablet. View detailed diagnostics, capture screenshots for reports, and create/save actuator configurations for easy deployment.
- Remote actuator control via Bluetooth
- View advanced diagnostics
- Capture screenshots for reports
- Create and save actuator configurations
- Push configurations to multiple actuators
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This is a Bluetooth utility designed to allow Flowserve Customer to control their MXb Smart Actuators from their IOS Tablet. This is designed to help customers who have units in hard to reach areas as they can control the unit from a distance. The large screen of a tablet also helps customers view advanced diagnostics items in a detailed way and capture screenshots to create performance reports. The app also allows customers to create Actuator Configurations which can be saved to the tablet and then pushed to one or multiple actuators without ever moving the knobs on the units.
Screenshots
Verdict
The clearest difference is in-app purchases: Flowserve FlowSync at none against Video tachometer's 1. Flowserve FlowSync also leads on rating (5.0 vs 4.6) and iOS requirement (9.0 vs 15.6). Video tachometer's advantage is ratings volume (84 vs 2) and update cadence (every 3 months vs every 8 months). On price, ads 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
Both are free to download. Video tachometer sells 1 one-off in-app purchase. Flowserve FlowSync asks for nothing beyond the download.
Flowserve FlowSync holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: Video tachometer has 84 ratings behind it against 2, so its average is the more settled of the two.
Video tachometer ships an update every 3 months, Flowserve FlowSync every 8 months. The most recent releases landed on September 10, 2026 and September 11, 2026 respectively.
| Parameter | Video tachometer | Flowserve FlowSync |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (84 ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 84.6% of reviews | — |
| Number of ratings | 84 — better | 2 |
| Update frequency | Every 3 months — better | Every 8 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 9.0 — better |
| Further details — not scored | ||
| Size | 5 MB | 170 MB |
| Age rating | 4+ | 4+ |
| Developer | Dmitriy Kharutskiy | Flowserve Corp |
Customer experience
Video tachometer
Flowserve FlowSync
In-app purchases
Video tachometer
- Full version$2.99
Flowserve FlowSync
No in-app purchases
Questions
Is Video tachometer free?
Is Flowserve FlowSync free?
Which has better reviews, Video tachometer or Flowserve FlowSync?
Do Video tachometer or Flowserve FlowSync have ads?
Which is updated more often, Video tachometer or Flowserve FlowSync?
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