Comparison

Mini4WD vs CalmPrime

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

Head to head
About

Mini4WD

This app uses your device's camera to automatically time Mini 4WD races. It can track lap times, fastest times, and average times, with manual measurement options available. Customize settings like passing sounds, vibration, and course length for an optimized racing experience.

Highlights
  • Automatic lap timing with camera detection
  • Manual measurement option
  • Records fastest and average times
  • Customizable passing sound and vibration
  • Adjustable number of lanes and laps
  • Course length setting for speed calculation
  • Share race results via Twitter, memo, or email
Read full description

It is a timer application that can measure the lap time, fastest time, average time of Mini 4WD with the camera. Manual measurement is also possible. [How to use] 0. From the setting menu, you can set the passing sound, vibration, number of lanes, number of measurement laps, course length, detection sensitivity, unit, etc. 1. Select the number of lanes. If you are not sure, please select 1 lane. 2. Set the number of measurement laps. Measurement will end automatically at the specified number of times. 3. Set the course length. It is used for speed calculation. Even if it is not set, it does not affect the measurement. 4. Secure the device so that the selected lane and course match. Even if it deviates a little, there is no problem as long as it fits within the range where the Mini 4WD can pass. 5. Tap the screen and wait for the Mini 4WD to pass first. 6. Run the Mini 4WD. 7. When the specified number of measurements is taken, the measurement is completed. You can see records from the button at the bottom left. Records can be transferred to twitter, memo app, or email with the Share button. * Long Press to interrupt the measurement and return to the TOP screen. * Manual measurement is possible with the button at the bottom right. It can be used for simple measurement from outside the course. * Detection method The passage judgment of Mini 4WD is regarded as detection when the average brightness of the shooting frame pixels of the camera exceeds the set sensitivity. When the sensitivity is 85, it is detected that the average brightness before and after the frame changes by 15%, When the sensitivity is 90, it is detected that the average brightness before and after the frame changes by 10%, When the sensitivity is 60, it is detected when the average brightness before and after the frame changes by 40%. If you fix the device, the accuracy will increase. Even if the camera shakes without fixing, it will not be erroneously detected unless the brightness changes significantly.

About

CalmPrime

Features
Read full description

Have you ever felt anxious, restless, or overwhelmed? Calm yourself — prime numbers will show you the answer. Just one gentle tap, and the primes will guide you through the chaos. With a single touch, CalmPrime leads you into a pure “prime meditation space.” CalmPrime — awaken your Stand and enter the digital world of meditation. prime numbers are solitary numbers that can only be divided by 1 and themselves... they give me strength. — Enrico Pucci Conquer your destiny through the power of primes!

Screenshots

Mini4WD4 screens
CalmPrime4 screens

Verdict

The call

The clearest difference is update cadence: CalmPrime at daily against Mini4WD's every 2 months. Mini4WD's advantage is iOS requirement (13.0 vs 16). On price, ads, in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Mini4WD ships an update every 2 months, CalmPrime daily. The most recent releases landed on November 3, 2026 and October 25, 2026 respectively.

Scorecard2 real differences · 7 level
Mini4WD versus CalmPrime: the parameters behind the verdict, then further details
ParameterMini4WDCalmPrime
PriceFreeFree
Rating4.0 (1 ratings) — better—
Number of ratings1 — better—
Update frequencyEvery 2 monthsDaily — better
AdsYesYes
In-app purchasesNoNo
MonetizationAd-supported—
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS13.0 — better16
Further details — not scored
Size29 MB31 MB
Age rating4+9+
DeveloperKatsuyoshi KonnoHUNG-PIN YU

In-app purchases

None

Mini4WD

No in-app purchases

None

CalmPrime

No in-app purchases

Questions

Is Mini4WD free?
Mini4WD is free to download, with no in-app purchases.
Is CalmPrime free?
CalmPrime is free to download, with no in-app purchases.
Do Mini4WD or CalmPrime have ads?
Both Mini4WD and CalmPrime show ads.
Which is updated more often, Mini4WD or CalmPrime?
Mini4WD ships an update every 2 months, and CalmPrime daily. Most recently, Mini4WD was updated on November 3, 2026 and CalmPrime on October 25, 2026.

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