Comparison

MR vs Clockwork

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

Head to head
About

MR

This utility app connects your compatible CASIO watch to your iPhone via Bluetooth. It enables various Mobile Link functions and allows for simplified watch operations through your phone's screen. Data can be transferred to the new CASIO WATCHES app.

Highlights
  • Bluetooth v4.0 connectivity
  • Mobile Link functions
  • Simplified watch operations
  • User data transfer
  • Location services for accurate time
Features
Read full description

Important - Please Read Request to Transfer to the CASIO WATCHES App (Support Termination Notification) The functionality of this app will be transferred to the new watch app, CASIO WATCHES. By updating to version 3.0, users of this app will be able to transfer their user data to CASIO WATCHES via this app. While we understand this may be inconvenient for some users, we ask that you transfer your data across, and continue using CASIO WATCHES in place of this app. ●Description This is the basic application for connecting and communicating with a Bluetooth(R) v4.0 enabled CASIO watch. Pairing your watch with an iPhone enables use of a variety of different Mobile Link functions that greatly enhance the iPhone experience. The MR-G Connected app also simplifies certain watch operations by letting you perform them on your phone screen. Visit the website below for details. http://world.g-shock.com/ We recommend using MR-G Connected on the following operating systems. Operation is not guaranteed for any operating system not listed below. Even if an operating system has been confirmed as compatible, software updates or display specifications may prevent proper display and/or operation. ⋅ iOS 14 or later. Applicable Watches: MRG-G2000, MRG-B1000, MRG-B2000 *Some watches unavailable in your region may be displayed in the application. This application uses location information to obtain accurate time. For "Location Service" in iPhone privacy settings, please "Always". If it is not "Always", the application will not work properly. Continued use of GPS running in the background can dramatically decrease battery life.

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

Screenshots

MR2 screens
Clockwork4 screens

Verdict

The call

The clearest difference is rating: Clockwork at 4.4 against MR's 3.5. Clockwork also leads on update cadence (every 3 weeks vs every 3 months) and ratings volume (24 vs 6). MR's advantage is in-app purchases (none vs 1) and review sentiment (55% vs 43%). On price, ads 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. Clockwork sells 1 one-off in-app purchase. MR asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Clockwork holds the better App Store score, 4.4 against 3.5. Both are backed by a comparable volume of ratings — 6 and 24 respectively. Written reviews complicate that: 55% of MR's written reviews are positive against 43% of Clockwork's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

MR ships an update every 3 months, Clockwork every 3 weeks. The most recent releases landed on September 20, 2026 and September 11, 2026 respectively.

Scorecard7 real differences · 3 level
MR versus Clockwork: the parameters behind the verdict, then further details
ParameterMRClockwork
PriceFreeFree
Rating3.5 (6 ratings)4.4 (24 ratings) — better
Positive reviews54.5% of reviews — better42.9% of reviews
Number of ratings624 — better
Update frequencyEvery 3 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPod — betteriPhone
Requires iOS11.0 — better16.4
Further details — not scored
Size127 MB242 MB
Age rating4+4+
DeveloperCASIO COMPUTER CO., LTD.Appfred AS

Customer experience

MR

All ratings6 ratings
Positive66.7%
Neutral0.0%
Negative33.3%
Written reviews11 reviews
Positive54.5%
Neutral9.1%
Negative36.4%

Clockwork

All ratings23 ratings
Positive78.3%
Neutral4.3%
Negative17.4%
Written reviews28 reviews
Positive42.9%
Neutral10.7%
Negative46.4%

In-app purchases

None

MR

No in-app purchases

1 purchases

Clockwork

One-time1
  • Clockwork Premium$5.99

Questions

Is MR free?
MR is free to download, with no in-app purchases.
Is Clockwork free?
Clockwork is free to download, with in-app purchases available.
Which has better reviews, MR or Clockwork?
Clockwork is rated higher. MR averages 3.5 out of 5 from 6 ratings, while Clockwork averages 4.4 from 24 ratings.
Do MR or Clockwork have ads?
Neither MR nor Clockwork shows ads.
Which is updated more often, MR or Clockwork?
MR ships an update every 3 months, and Clockwork every 3 weeks. Most recently, MR was updated on September 20, 2026 and Clockwork on September 11, 2026.

Other comparisons