Comparison

Clockwork vs Phono Calibre

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

Phono Calibre

Features
Read full description

PhonoCalibre helps vinyl listeners measure turntable speed stability and platter level with the motion sensors already in iPhone Place iPhone at the center of the platter choose 33 45 or 78 RPM and start a measurement while the turntable spins PhonoCalibre analyzes motion data to estimate average RPM speed error wow and flutter drift peak variation and measurement confidence Use the Level tab to align your platter before a run The live bubble view shows pitch roll and tilt and gives simple guidance for raising the correct edge until the platter is level Each run is saved in history so you can compare before and after adjustments review charts share a plain report or export CSV data for your records Designed for turntable setup maintenance and repeatable checks without a test record or microphone

Screenshots

Clockwork4 screens
Phono Calibre4 screens

Verdict

The call

The clearest difference is price: Clockwork at Free against Phono Calibre's $2.99. Clockwork also leads on iOS requirement (16.4 vs 18.6). Phono Calibre's advantage is in-app purchases (none vs 1). On 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

Clockwork is free to download; Phono Calibre costs $2.99 up front. Clockwork sells 1 one-off in-app purchase. Phono Calibre asks for nothing beyond the download.

Scorecard3 real differences · 7 level
Clockwork versus Phono Calibre: the parameters behind the verdict, then further details
ParameterClockworkPhono Calibre
PriceFree — better$2.99
Rating4.4 (24 ratings) — better—
Positive reviews45.5% of reviews—
Number of ratings24 — better—
Update frequencyEvery 3 weeks—
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhoneiPhone, iPad — better
Requires iOS16.4 — better18.6
Further details — not scored
Size242 MB9 MB
Age rating4+4+
DeveloperAppfred ASMaaDoTaa

In-app purchases

1 purchases

Clockwork

One-time1
  • Clockwork Premium$5.99
None

Phono Calibre

No in-app purchases

Questions

Is Clockwork free?
Clockwork is free to download, with in-app purchases available.
Is Phono Calibre free?
Phono Calibre costs $2.99, with no in-app purchases.
Do Clockwork or Phono Calibre have ads?
Neither Clockwork nor Phono Calibre shows ads.

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