Comparison

Strobe tachometer (RPM meter) vs Primee

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Strobe tachometer function
  • Laser tachometer mode
  • Magnetic tachometer mode
  • Adjustable flicker frequency
  • RPM and Hz display
  • High precision measurement
Read full description

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.

About

Primee

Features
Read full description

Estamos empolgados em apresentar o novo aplicativo Primee, o aplicativo revolucionário que vai transformar a segurança e a gestão de acessos no seu condomínio ou empresa! O aplicativo da Primee é uma solução voltada para condomínios que buscam aperfeiçoar a segurança, comunicação e processos internos .

Screenshots

Strobe tachometer (RPM meter)4 screens
Primee4 screens

Verdict

The call

The clearest difference is in-app purchases: Primee at none against Strobe tachometer (RPM meter)'s 2. Primee also leads on update cadence (every 2 months vs every 4 months). On price, 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Strobe tachometer (RPM meter) sells 2 one-off in-app purchases. Primee asks for nothing beyond the download.

UpkeepUpdate frequency

Strobe tachometer (RPM meter) ships an update every 4 months, Primee every 2 months. The most recent releases landed on September 9, 2026 and June 1, 2026 respectively.

Scorecard2 real differences · 8 level
Strobe tachometer (RPM meter) versus Primee: the parameters behind the verdict, then further details
ParameterStrobe tachometer (RPM meter)Primee
PriceFreeFree
Rating4.3 (83 ratings) — better—
Positive reviews69.0% of reviews—
Number of ratings83 — better—
Update frequencyEvery 4 monthsEvery 2 months — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS15.615.1 — better
Further details — not scored
Size16 MB40 MB
Age rating4+4+
DeveloperDmitriy KharutskiyOUTKEY TECNOLOGIA LTDA - EPP

In-app purchases

2 purchases

Strobe tachometer (RPM meter)

One-time2
  • Full version of the stroboscopic tachometer$2.99
  • Laser Tachometer and Magnetic$2.99
None

Primee

No in-app purchases

Questions

Is Strobe tachometer (RPM meter) free?
Strobe tachometer (RPM meter) is free to download, with in-app purchases available.
Is Primee free?
Primee is free to download, with no in-app purchases.
Do Strobe tachometer (RPM meter) or Primee have ads?
Neither Strobe tachometer (RPM meter) nor Primee shows ads.
Which is updated more often, Strobe tachometer (RPM meter) or Primee?
Strobe tachometer (RPM meter) ships an update every 4 months, and Primee every 2 months. Most recently, Strobe tachometer (RPM meter) was updated on September 9, 2026 and Primee on June 1, 2026.

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