Comparison

AtomicClock vs Precise Timestamp

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

Head to head
About

AtomicClock

This app displays the exact current time synchronized with NTP servers, offering a customizable clock view for precise time checks. It's ideal for setting watches, verifying timestamps, or comparing local and network time.

Highlights
  • Precise time from NTP servers
  • Customizable clock faces
  • Select or add time servers
  • Local and UTC views
  • 12/24 hour modes
  • Customizable time format
  • Acoustic ticking
Features
Read full description

Check precise NTP reference time at a glance. AtomicClock helps you set watches, wall clocks, cameras, and other devices, compare local time with UTC, and follow moments when every second matters. Clear analog and digital time AtomicClock displays current time from NTP servers that reference atomic clocks. Choose a predefined server or add your own, then view local or UTC time in a clean analog or digital clock. Customize your reference clock • Switch between 12-hour and 24-hour time • Customize the time format • Choose from multiple clock faces and hands • Use a smooth, fluid second hand • Add acoustic ticking or the Greenwich Time Signal • Tap the screen to hide information and controls, freeze the display, or mute ticking Details for precise time checks View technical NTP information, including round-trip time and server stratum. Whether you are checking a timestamp, preparing a camera, aligning a wall clock, or setting a watch by hand, the seconds remain clear and easy to follow. AtomicClock is free to use. AtomicClock Pro is available as a one-time purchase with no subscription. It unlocks your preferred clock face, hands, and font, removes ads, and includes upcoming Pro features. AtomicClock displays NTP reference time for comparison and does not change your device’s system time. Results can vary with the selected server, network conditions, and device behavior.

About

Precise Timestamp

Capture events with unparalleled accuracy, down to the tenth of a second. Synchronize with NTP servers for precise timekeeping and view detailed sync information. Organize events with descriptions and toggle between absolute and relative time displays.

Highlights
  • NTP server synchronization
  • Tenth-of-a-second accuracy
  • Absolute and relative time modes
  • Event descriptions
  • Event sorting and grouping
  • Sync time details
Features
Read full description

Precise Timestamp: Capture Every Moment Precise Timestamp is your go-to app for capturing the exact time of events down to the tenth of a second. Ensure every moment is pinpointed with utmost accuracy. Features: Unrivaled Timekeeping Accuracy - Achieve high-precision time, synchronized with NTP servers. - Gain complete transparency with details on the last sync time, offset, and round trip time. Dynamic Display Modes: - Effortlessly toggle between Absolute and Relative time displays with a simple click. - Your events, neatly sorted and grouped by dates. - Add rich descriptions to your events, ensuring each stands out. Seamless Event Management: - Benefit from a user-friendly bottom bar for quick toggling between editing and deletion.

Screenshots

AtomicClock4 screens
Precise Timestamp4 screens

Verdict

The call

The clearest difference is in-app purchases: Precise Timestamp at none against AtomicClock's 1. Precise Timestamp also leads on ads (none vs shown) and review sentiment (100% vs 84%). AtomicClock's advantage is ratings volume (5.5K vs 7). On price, update cadence 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. AtomicClock sells 1 one-off in-app purchase. Precise Timestamp asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Precise Timestamp holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: AtomicClock has 5.5K ratings behind it against 7, so its average is the more settled of the two. Written reviews point the same way: 84% of AtomicClock's written reviews are positive against 100% of Precise Timestamp's.

UpkeepUpdate frequency

AtomicClock ships an update every 3 weeks, Precise Timestamp every 5 weeks. The most recent releases landed on October 12, 2026 and September 17, 2026 respectively.

Scorecard7 real differences · 3 level
AtomicClock versus Precise Timestamp: the parameters behind the verdict, then further details
ParameterAtomicClockPrecise Timestamp
PriceFreeFree
Rating4.8 (5.5K ratings)5.0 (7 ratings) — better
Positive reviews84.2% of reviews100.0% of reviews — better
Number of ratings5.5K — better7
Update frequencyEvery 3 weeks — betterEvery 5 weeks
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.013.0 — better
Further details — not scored
Size17 MB19 MB
Age rating4+4+
DeveloperTimo PartlChris Gillin

Customer experience

AtomicClock

All ratings5,539 ratings
Positive96.5%
Neutral1.8%
Negative1.8%
Written reviews241 reviews
Positive84.2%
Neutral3.3%
Negative12.4%

Precise Timestamp

All ratings7 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews3 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

AtomicClock

Reported bugs

3 issues
  • Crashes on certain iOS versions
  • Occasional freezing of hands
  • Countdown timer sound not working

Requested features

5 requests
  • Add GMT/dual time display
  • Implement widget support
  • Add different second hand sounds
  • Allow setting background color to match watch
  • Include alarm/timer functionality

Precise Timestamp

Not enough reviews yet to summarise bugs or requests.

In-app purchases

1 purchases

AtomicClock

One-time1
  • Lifetime Pro Version$6.99
None

Precise Timestamp

No in-app purchases

Questions

Is AtomicClock free?
AtomicClock is free to download, with in-app purchases available.
Is Precise Timestamp free?
Precise Timestamp is free to download, with no in-app purchases.
Which has better reviews, AtomicClock or Precise Timestamp?
Precise Timestamp is rated higher. AtomicClock averages 4.8 out of 5 from 5.5K ratings, while Precise Timestamp averages 5.0 from 7 ratings.
Do AtomicClock or Precise Timestamp have ads?
AtomicClock shows ads; Precise Timestamp does not.
Which is updated more often, AtomicClock or Precise Timestamp?
AtomicClock ships an update every 3 weeks, and Precise Timestamp every 5 weeks. Most recently, AtomicClock was updated on October 12, 2026 and Precise Timestamp on September 17, 2026.

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