Serial vs Strobe tachometer (RPM meter)
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Serial
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This applet helps you train your mental skills to calculate reduced serial sums using the approach of 'outcasting the tens'. It targets close-up magicians familiar to tricks that require such skills. The overall design of this app is geared towards Alain Nu's 'Serial Thrillers' plot as described in Alain Nu, 'Serial Thrillers', Alain Nu 2009. The app cycles through 'Serial Thrillers'' logical phases and serves as a virtual spectator who whispers random digits. It allows you to validate your conclusions against the correct response before taking you right into the next cycle. This is another app by yeahgic.com that aims at increasing your learning curve for mentally intensive tricks. Take it with you whereever you go. Some Features: - serial numbers up to 26 digt length - The design is kept straightforward and simple and fully tailored to help you focus on the real work. Practicing magic you don't want no complicated, overloaded and distracting user interface. Less is more. yeahgic.com dedicates to card magic apps since 2010. Its other commercial apps address the ACAAN plot, the Twice as Hard plot, Stack Training, and - probably the most courageous app in card magic academy - the Symbolic Method editor. - Note: the app's design is limited to ascii-font without any pictures. No buttons - it responds to gestures only. The help text is spartanic without formatting. It has the minimum design required to achieve its purpose. Check out the free 'Random Input' app available at the Appstore to experience the look and feel. 'Serial-Sum Trainer' was created with passion and driven by commitment. If this is not what you expected, and considering the solid price, please do not hesitate to make use of Appstore's return option or contact yeahgic.com directly. ------------ Serial-Sum Trainer forms part of a comprehensive suite of apps that dedicate to technical learning tools for close-up magicians. Serial-Sum Trainer helps you train your mental skills to calculate reduced serial sums using the approach of 'outcasting the tens'. It targets close-up magicians familiar to tricks that require such skills. The app is geared towards Alain Nu's 'Serial Thrillers' plot as described in Alain Nu, 'Serial Thrillers', Alain Nu 2009. A radical slim design. Cycle through the logical phases of the challenges at hand. Name it the 'virtual spectator' concept. Credits: - credits to Alain Nu for his 'Serial Thrillers' plot as described in Alain Nu, 'Serial Thrillers', Alain Nu 2009. - I like to thank Alain Nu for the permission to use his ideas for this commercial app. Some Features: - serial numbers up to 26 digit length - display and whisper modes - feedback driven development - feels almost like a true deck of cards. Practicing card magic you don't want no complicated, overloaded and distracting user interface. Less is more. - probably the most complete, and straightforward solution available. A series of numbers, its serial count. Which digit is missing? Think, calculate, check, and again. Swipe, swipe, think, verify. Serial swipes. To experience the look and feel of 'Serial-Sum Trainer' load the free 'Random Input' app available by this developer.
Strobe tachometer (RPM meter)
Measure rotational speeds of objects using your phone's flashlight, laser, or magnetic sensor. Detect precise RPMs with adjustable flicker frequencies and a wide measurement range. Ideal for analyzing fan speeds, engine RPMs, and more.
- Strobe tachometer function
- Laser tachometer mode
- Magnetic tachometer mode
- Adjustable flicker frequency
- RPM and Hz display
- High precision measurement
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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.
Screenshots
Verdict
The clearest difference is price: Strobe tachometer (RPM meter) at Free against Serial's $2.99. Serial's advantage is in-app purchases (none vs 2). On update cadence, ads, device support and iOS requirement 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
Strobe tachometer (RPM meter) is free to download; Serial costs $2.99 up front. Strobe tachometer (RPM meter) sells 2 one-off in-app purchases. Serial asks for nothing beyond the download.
Serial ships an update every 7 months, Strobe tachometer (RPM meter) every 4 months. The most recent releases landed on September 2, 2026 and October 16, 2026 respectively.
| Parameter | Serial | Strobe tachometer (RPM meter) |
|---|---|---|
| Price | $2.99 | Free — better |
| Rating | — | 4.3 (83 ratings) — better |
| Positive reviews | — | 69.0% of reviews |
| Number of ratings | — | 83 — better |
| Update frequency | Every 7 months | Every 4 months — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Free with in-app purchases |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.6 | 15.6 |
| Further details — not scored | ||
| Size | 5 MB | 16 MB |
| Age rating | 4+ | 4+ |
| Developer | Ralph Cos | Dmitriy Kharutskiy |
In-app purchases
Serial
No in-app purchases
Strobe tachometer (RPM meter)
- Full version of the stroboscopic tachometer$2.99
- Laser Tachometer and Magnetic$2.99
Questions
Is Serial free?
Is Strobe tachometer (RPM meter) free?
Do Serial or Strobe tachometer (RPM meter) have ads?
Which is updated more often, Serial or Strobe tachometer (RPM meter)?
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