Comparison

Strobr Scope vs Camera RPM Meter

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

Head to head
About

Strobr Scope

This utility app uses your device's camera to measure the frequencies of various cycles, including rotational speeds and electrical light frequencies. It offers a more convenient and less distracting alternative to traditional stroboscopes, capable of measuring even very slow rotations.

Highlights
  • Camera-based stroboscope
  • Measures rotational frequencies
  • Measures electrical light frequencies
  • Measures slow rotations
  • Continuously variable frame rates
  • Convenient and less distracting
Features
Read full description

Strobr Scope is a camera-based stroboscope app that relies on continuously variable frame rates to measure the frequencies of cycles. A traditional stroboscope flashes bright lights at a specific frequency that can be easily matched to the rotational frequency of i.e. a car wheel using persistence of vision (POV), allowing the rotational speed to be measured. Strobr Scope works similarly, but can also measure many things like electrical light frequencies and very low slow rotations that a traditional stroboscope cannot. It’s also more convenient and much less distracting to others! This app was built at PennApps 2017 and won top 30 there.

About

Camera RPM Meter

Measure rotational speed using your phone's camera or a simulated strobe light. Simply mark the rotating object and adjust the settings until it appears stationary to get an accurate RPM reading. The app also functions as a torchlight.

Highlights
  • Measure RPM with mobile camera
  • Measure RPM with strobe light simulation
  • Adjust RPM with seek bar or buttons
  • Torchlight functionality
  • Offline use
  • Compact app size
Features
Read full description

How it works: With Camera: First, mark the edge of the machine whose rotational speed you want to find. Please make sure that the machine is properly visible in the camera preview. Now, go to the app, open camera RPM and adjust the RPM using the plus, minus buttons or seek bar on the screen. Now adjust the RPM unless the rotating machine becomes stationary in the camera preview. Read the value from the input field; this is the RPM of your rotating machine. With Strobe Light First, mark the edge of the machine whose rotational speed you want to find. Ensure that the machine is placed in suitable darkness. Now, go to the app, turn it on and set the approximate value of RPM using the Plus, minus button or seek bar in the strobe light module of the app. Focus your flashlight on the rotating machine, then adjust the RPM using the bar up or down until the mark on the machine appears stationary. Read the value from the input field; this is the RPM of your rotating machine. Features of the RPM Meter - Strobe Lights: • Simple and smooth interface • Check RPM using mobile camera • Check RPM using Strobe light • Easy-to-use app with a user-friendly design • Compact app size • No internet connectivity needed • On/off button functions like a torch • RPM Meter – Strobe Light can be used as a torchlight • Strobe light mode works like a stroboscope. • The strobe light speed can be set in different ways, such as using seek bar or plus/minus buttons in the app.

Screenshots

Strobr Scope2 screens
Camera RPM Meter3 screens

Verdict

The call

The clearest difference is rating: Strobr Scope at 3.7 against Camera RPM Meter's 2.3. Strobr Scope also leads on in-app purchases (none vs 1) and ads (none vs shown). Camera RPM Meter's advantage is update cadence (every 3 weeks vs every 12 months) and ratings volume (33 vs 3). On price 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Camera RPM Meter sells 1 one-off in-app purchase. Strobr Scope asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Strobr Scope holds the better App Store score, 3.7 against 2.3. That said, the two scores are not equally well evidenced: Camera RPM Meter has 33 ratings behind it against 3, so its average is the more settled of the two.

UpkeepUpdate frequency

Strobr Scope ships an update every 12 months, Camera RPM Meter every 3 weeks. The most recent releases landed on September 28, 2026 and September 29, 2026 respectively.

Scorecard7 real differences · 3 level
Strobr Scope versus Camera RPM Meter: the parameters behind the verdict, then further details
ParameterStrobr ScopeCamera RPM Meter
PriceFreeFree
Rating3.7 (3 ratings) — better2.3 (33 ratings)
Positive reviews—15.0% of reviews
Number of ratings333 — better
Update frequencyEvery 12 monthsEvery 3 weeks — better
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS10.0 — better12.0
Further details — not scored
Size14 MB14 MB
Age rating4+4+
DeveloperAlexander ZhangIhsan Ullah

Customer experience

Strobr Scope

All ratings3 ratings
Positive66.7%
Neutral0.0%
Negative33.3%

Camera RPM Meter

All ratings33 ratings
Positive33.3%
Neutral0.0%
Negative66.7%
Written reviews20 reviews
Positive15.0%
Neutral5.0%
Negative80.0%

In-app purchases

None

Strobr Scope

No in-app purchases

1 purchases

Camera RPM Meter

One-time1
  • Un Lock All Features$3.99

Questions

Is Strobr Scope free?
Strobr Scope is free to download, with no in-app purchases.
Is Camera RPM Meter free?
Camera RPM Meter is free to download, with in-app purchases available.
Which has better reviews, Strobr Scope or Camera RPM Meter?
Strobr Scope is rated higher. Strobr Scope averages 3.7 out of 5 from 3 ratings, while Camera RPM Meter averages 2.3 from 33 ratings.
Do Strobr Scope or Camera RPM Meter have ads?
Camera RPM Meter shows ads; Strobr Scope does not.
Which is updated more often, Strobr Scope or Camera RPM Meter?
Strobr Scope ships an update every 12 months, and Camera RPM Meter every 3 weeks. Most recently, Strobr Scope was updated on September 28, 2026 and Camera RPM Meter on September 29, 2026.

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