Comparison

Clockwork vs BMI Calculator

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

Head to head
About

Clockwork

This app allows you to measure the accuracy of your watches using your phone's camera. It compares an image of your watch to an atomic clock to calculate its timekeeping offset. Track accuracy over time with graphs and store detailed watch information.

Highlights
  • Measure accuracy using images
  • Atomic clock synchronization
  • Accuracy over time graphs
  • Store detailed watch information
  • Dark mode support
  • Digital and analog atomic clock
Features
Read full description

Measure the accuracy of your watches today! Clockwork includes several useful features. You can store watch information, measure watch accuracy, and set your watch using a clock synchronized with atomic time. Check it out now! _MEASUREMENTS USING IMAGES_ Most other watch measurement apps require either third-party equipment or that you press a button at a specific time. Additional equipment is often expensive, and timing a button press is difficult to do precisely. Clockwork solves this by letting you take a picture of your watch and indicate the time shown in the image. We then synchronize the image capture time with atomic time before comparing it with the time shown on the watch to calculate an offset. Taking measurements over time provides a real-world view of your watch's accuracy. _GRAPHS_ Watch your measurements over time on a beautifully crafted graph. The graph shows how your watch's accuracy changes over time and offers several modes to help you understand its performance. _WHY MEASURE?_ Knowing the accuracy of your watch is interesting on its own, but it also has several practical uses. It can indicate when it is time for a service, and documented accuracy could increase resale value, especially for vintage watches. _STORE DETAILED INFORMATION_ In case of theft or accidents, it will always help to have your information stored in a secure place. _ATOMIC CLOCK, DARK MODE AND MUCH MORE!_ Clockwork includes an atomic clock in both digital and analog formats to help you set your watch as precisely as possible. Powerful settings such as Dark or Light mode, separate day and date formats, and different ways to sort your watches let you customize the app to your liking. // Appfred AS © 2026

About

BMI Calculator

Calculate your Body Mass Index (BMI) quickly and accurately using your age, gender, height, and weight. Track your progress with visual tools and personalized insights to support your health and fitness goals.

Highlights
  • Intuitive BMI meter with color-coded gauge
  • Metric and imperial unit support
  • Save and track past BMI entries
  • Visual progress bar with personalized status
  • Includes age and gender for better insight
  • Dark mode-friendly design
Features
Read full description

Stay on top of your health with the beautifully designed BMI Calculator app. Whether you’re looking to lose weight, build muscle, or simply maintain a healthy lifestyle, this app provides quick and accurate Body Mass Index (BMI) calculations based on your age, gender, height, and weight. Features: • Intuitive BMI meter with color-coded gauge • Supports both metric (kg/cm) and imperial (lb/ft/in) units • Animated pointer with real-time updates • Save and track past BMI entries • Visual progress bar with personalized BMI status • Includes age and gender for better insight • Lightweight and easy to use • Dark mode-friendly design • Built-in interstitial ad logic for seamless use Whether you’re a fitness enthusiast or just starting your health journey, this app is your perfect companion. Understand your body better — download now and calculate your BMI in seconds!

Screenshots

Clockwork4 screens
BMI Calculator4 screens

Verdict

The call

The clearest difference is rating: Clockwork at 4.4 against BMI Calculator's 1.5. Clockwork also leads on update cadence (every 3 weeks vs every 3 months) and ratings volume (24 vs 2). BMI Calculator's advantage is in-app purchases (none vs 1) and device support (3 vs 1). On price and ads 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. Clockwork sells 1 one-off in-app purchase. BMI Calculator asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Clockwork holds the better App Store score, 4.4 against 1.5. That said, the two scores are not equally well evidenced: Clockwork has 24 ratings behind it against 2, so its average is the more settled of the two.

UpkeepUpdate frequency

Clockwork ships an update every 3 weeks, BMI Calculator every 3 months. The most recent releases landed on October 30, 2026 and October 24, 2026 respectively.

Scorecard7 real differences · 3 level
Clockwork versus BMI Calculator: the parameters behind the verdict, then further details
ParameterClockworkBMI Calculator
PriceFreeFree
Rating4.4 (24 ratings) — better1.5 (2 ratings)
Positive reviews45.5% of reviews—
Number of ratings24 — better2
Update frequencyEvery 3 weeks — betterEvery 3 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhoneiPhone, iPad, iPod — better
Requires iOS16.412.0 — better
Further details — not scored
Size242 MB49 MB
Age rating4+4+
DeveloperAppfred ASPIXOPLAY IT SERVICES PRIVATE LIMITED

Customer experience

Clockwork

All ratings24 ratings
Positive79.2%
Neutral4.2%
Negative16.7%
Written reviews33 reviews
Positive45.5%
Neutral9.1%
Negative45.5%

BMI Calculator

All ratings2 ratings
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

1 purchases

Clockwork

One-time1
  • Clockwork Premium$5.99
None

BMI Calculator

No in-app purchases

Questions

Is Clockwork free?
Clockwork is free to download, with in-app purchases available.
Is BMI Calculator free?
BMI Calculator is free to download, with no in-app purchases.
Which has better reviews, Clockwork or BMI Calculator?
Clockwork is rated higher. Clockwork averages 4.4 out of 5 from 24 ratings, while BMI Calculator averages 1.5 from 2 ratings.
Do Clockwork or BMI Calculator have ads?
Neither Clockwork nor BMI Calculator shows ads.
Which is updated more often, Clockwork or BMI Calculator?
Clockwork ships an update every 3 weeks, and BMI Calculator every 3 months. Most recently, Clockwork was updated on October 30, 2026 and BMI Calculator on October 24, 2026.

Other comparisons