Comparison

Twelve O'clock vs Watch Accuracy Checker

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

Head to head
About

Twelve O'clock

Easily track the accuracy of your mechanical watches over time. Manually log checkpoints to calculate seconds per day and visualize performance with charts. Manage your watch collection with photos and learn more about horology.

Highlights
  • Manage watch collection
  • Add/edit/remove watches
  • Include watch photos
  • Track watch accuracy
  • Calculate seconds per day
  • View accuracy charts
  • Horology content
Features
Read full description

Twelve O’clock is an app that helps track your watch accuracy easily in a realistic way. I can’t stress this enough: it’s “tracking”, not measuring instantaneous accuracy like a timegrapher device. It’s a manual and oldschool job but it brings so much fun. It reminds me of the old days when I had to synchronize my watch to the clock on the TV at 7pm every day. With Twelve O'clock you can: ** MANAGE YOUR WATCH COLLECTION * Add, edit, remove any item in a list of your watch collection * Include a nice wristshot of each watch ** KNOW YOUR WATCH ACCURACY * Simply add some checkpoints and let the app calculate the accuracy in *second per day* * A nice chart of the accuracy over the time ** LEARN MORE ABOUT HOROLOGY * Curated content for watch lovers (like me)

About

Watch Accuracy Checker

Measure and track the timekeeping accuracy of your mechanical, automatic, or quartz wristwatches. The app provides a reference timer and allows you to capture screenshots for comparison, maintaining a history of your tracking sessions.

Highlights
  • Add and edit watch details
  • Track accuracy against global time
  • Foreground and background timer
  • Multiple watch tracking
  • Screenshot capture for comparison
  • Tracking history with timestamps
  • Tracker running notifications
Features
Read full description

This simple, free and easy to use app will help you measure and track the accuracy of your Mechanical, Automatic or Quartz wrist watches. Features of the app: - Take a snap and add a watch you want to check for accuracy. - Edit Watch if needed. - No restrictions on number of watches that can be added and tracked. - Check accuracy of your watch in against current global time. - Start and Stop timer as per your requirement. - Timer runs in foreground and background as well. - Ability to run tracker for multiple watches. - Ability to reset the timer in case it is needed. - Screenshot is captured when timer is stopped which makes it easy to compare seconds lost or gained. - History of tracking is maintained in the app. - Time elapsed along with time stamp is shown in tracking history. - Notifications to the user about running tracker so user knows how long tracker has been on. - Settings available to set the notification interval for the tracker. How to use this app? Objective of this app is to give you the ability to check accuracy of your wrist watch. Our app has an accurate system watch which is used as the reference. You need to perform following steps to achieve the objective. 1. Add your Watch 2. Track Watch 3. View track history to check watch accuracy How to Add Watch? - Click on ‘My Watches’ in footer menu. - The click + icon. - Enter name of watch. - Take picture of the watch. - Click ‘Add’. - It will be added in My Watch List. How to Track Watch? - Click on ‘My Watches’ in footer menu. - Click on ‘History’ button for the watch. - Tracker screen will open with phone’s camera on and app’s reference watch with only Seconds hand in it. - Start and Restart button is there on tracker screen. - Clicking on Start button starts the tracking and button changes to “Stop”. - Before starting tracking, you need to super impose the app’s reference watch on to your wrist watch. - As soon as your wrist watch’s second hand reaches zero and matches the static second hand of the app you need to start tracking. - After a few hours have passed, when you are ready to stop the tracking, then again, you need to super impose the app’s reference watch on to your wrist watch. - Clicking on “Stop” button will stop the tracking. - When tracking is stopped, a screenshot is taken by the app and is saved in history of the watch. - This screenshot show app’s reference watch along with your wrist watch. It will show time of tracking and elapsed time of tracking. - Based on position of ‘Seconds hand’ of your wrist watch and app’s watch in the screenshot, you can check the accuracy of your watch. - If both are on same position, your watch is accurate. How to view Tracking History of a Watch? - Click on ‘My Watches’ in footer menu. - Click on ‘History’ button for the watch. - Tracking History of the Watch will be displayed. - Record will show time of tracking and elapsed time of tracking.

Screenshots

Twelve O'clock4 screens
Watch Accuracy Checker4 screens

Verdict

The call

The clearest difference is rating: Twelve O'clock at 4.4 against Watch Accuracy Checker's 1.0. Twelve O'clock also leads on review sentiment (91% vs 67%) and ratings volume (83 vs 1). Watch Accuracy Checker's advantage is in-app purchases (none vs 1). On price, update cadence, 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. Twelve O'clock sells 1 one-off in-app purchase. Watch Accuracy Checker asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Twelve O'clock holds the better App Store score, 4.4 against 1.0. That said, the two scores are not equally well evidenced: Twelve O'clock has 83 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 91% of Twelve O'clock's written reviews are positive against 67% of Watch Accuracy Checker's.

UpkeepUpdate frequency

Twelve O'clock ships an update every 3 weeks, Watch Accuracy Checker monthly. The most recent releases landed on November 3, 2026 and October 30, 2026 respectively.

Scorecard5 real differences · 5 level
Twelve O'clock versus Watch Accuracy Checker: the parameters behind the verdict, then further details
ParameterTwelve O'clockWatch Accuracy Checker
PriceFreeFree
Rating4.4 (83 ratings) — better1.0 (1 ratings)
Positive reviews91.1% of reviews — better66.7% of reviews
Number of ratings83 — better1
Update frequencyEvery 3 weeks — betterMonthly
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.0 — better15.6
Further details — not scored
Size46 MB14 MB
Age rating4+4+
DeveloperHieu PhamCogniter Technologies Pvt Ltd

Customer experience

Twelve O'clock

All ratings82 ratings
Positive84.1%
Neutral1.2%
Negative14.6%
Written reviews123 reviews
Positive91.1%
Neutral0.8%
Negative8.1%

Watch Accuracy Checker

All ratings1 ratings
Positive0.0%
Neutral0.0%
Negative100.0%
Written reviews3 reviews
Positive66.7%
Neutral0.0%
Negative33.3%

Bugs and requests

Twelve O'clock

Reported bugs

11 issues
  • App freezes at loading requiring phone restart
  • Data deletion after app updates
  • Data loss on app crash
  • Graph display glitches after checkpoints
  • Photo checkpoint feature returns 'old photo not supported' error
Show 6 more
  • Beeping only works when phone not in silent mode
  • Sort function not working
  • Screenshot sharing produces blank page
  • Calculation errors showing ~150 second variance
  • Checkpoint history doesn't display correctly
  • Swiping left to delete checkpoints not intuitive

Requested features

18 requests
  • iCloud/cloud synchronization across devices
  • Notifications or reminders for checkpoints
  • Current time button on checkpoint screen
  • Larger buttons for 15/30/45 second marks
  • Power reserve tracking
Show 13 more
  • Wear frequency tracking
  • Average accuracy by watch position
  • Widget support
  • Atomic clock built into app
  • Regulator clock layout for time setting
  • In-app feedback option (instead of Twitter)
  • Automatic time reading from watch photos
  • 12-hour time format option
  • Sort function improvements
  • Year display in checkpoint history
  • Chrono24 account integration
  • Regular article updates
  • Export to Excel/CSV

Watch Accuracy Checker

Not enough reviews yet to summarise bugs or requests.

In-app purchases

1 purchases

Twelve O'clock

One-time1
  • Twelve Plus$1.99
None

Watch Accuracy Checker

No in-app purchases

Questions

Is Twelve O'clock free?
Twelve O'clock is free to download, with in-app purchases available.
Is Watch Accuracy Checker free?
Watch Accuracy Checker is free to download, with no in-app purchases.
Which has better reviews, Twelve O'clock or Watch Accuracy Checker?
Twelve O'clock is rated higher. Twelve O'clock averages 4.4 out of 5 from 83 ratings, while Watch Accuracy Checker averages 1.0 from 1 ratings.
Do Twelve O'clock or Watch Accuracy Checker have ads?
Neither Twelve O'clock nor Watch Accuracy Checker shows ads.
Which is updated more often, Twelve O'clock or Watch Accuracy Checker?
Twelve O'clock ships an update every 3 weeks, and Watch Accuracy Checker monthly. Most recently, Twelve O'clock was updated on November 3, 2026 and Watch Accuracy Checker on October 30, 2026.

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