Comparison

Twelve O'clock vs QC Lens

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

QC Lens

Read full description

QC Lens is a private, on-device workspace for inspecting watch quality-control photos. Import a complete photo set, correct camera perspective, inspect dial alignment with a precise 12-marker grid, record concerns, work through a practical checklist, and read timegrapher photos with on-device text recognition. Every OCR result remains a draft until you confirm or edit it. QC Lens preserves imported originals. Perspective, zoom, grid, and annotation data are stored separately, and photos are never uploaded by the app. Export an annotated dial image or an editable summary when you want another opinion. QC Lens assists visual inspection. It does not authenticate watches and never makes a GL/RL decision for you.

Screenshots

Twelve O'clock4 screens
QC Lens4 screens

Verdict

The call

The clearest difference is in-app purchases: QC Lens at none against Twelve O'clock's 1. Twelve O'clock's advantage is device support (3 vs 1) and iOS requirement (15.0 vs 18.0). 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. Twelve O'clock sells 1 one-off in-app purchase. QC Lens asks for nothing beyond the download.

Scorecard3 real differences · 7 level
Twelve O'clock versus QC Lens: the parameters behind the verdict, then further details
ParameterTwelve O'clockQC Lens
PriceFreeFree
Rating4.4 (83 ratings) — better—
Positive reviews91.1% of reviews—
Number of ratings83 — better—
Update frequencyEvery 3 weeks—
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS15.0 — better18.0
Further details — not scored
Size46 MB3 MB
Age rating4+4+
DeveloperHieu PhamTakamasa Hirayama

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

QC Lens

Not enough reviews yet to summarise bugs or requests.

In-app purchases

1 purchases

Twelve O'clock

One-time1
  • Twelve Plus$1.99
None

QC Lens

No in-app purchases

Questions

Is Twelve O'clock free?
Twelve O'clock is free to download, with in-app purchases available.
Is QC Lens free?
QC Lens is free to download, with no in-app purchases.
Do Twelve O'clock or QC Lens have ads?
Neither Twelve O'clock nor QC Lens shows ads.

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