Comparison

Prime Time NTP vs Atomic Exact Time

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

Head to head
About

Prime Time NTP

This utility app displays the precise current time, accurate to the millisecond, by querying multiple NTP servers. It offers detailed insights into clock synchronization and network performance, with advanced features available via a one-time purchase.

Highlights
  • Millisecond time display
  • Queries multiple NTP servers
  • Detailed sync accuracy
  • Network performance metrics
  • Adaptive polling
  • One-time Pro upgrade
Features
Read full description

"Prime Time" is a high-precision time app that shows the true time, accurate to the millisecond. It queries NTP servers directly — the same infrastructure that keeps the internet in sync — and works out the correct time from their answers. Your device's own clock is never used for the display. [New in version 1.3] • Server details: tap any server to see everything about it: the address that actually answered, stratum, reference (with a reverse lookup of its name), any announced leap second, root delay and dispersion, server processing time, jitter, estimated error, and its last eight exchanges. • Now in German and French, alongside English and Japanese. • A new typeface for small text and figures. The large clock is unchanged. • The Display Legend now explains the main screen's headings, including which way the offset sign points. • A redesigned Pro screen. [Free — one server, in full detail] • Real-time sync with one NTP server of your choice • Every exchange laid open: address, stratum, reference, root delay, jitter, estimated error and the last eight exchanges • Millisecond display, refreshed up to 120 times a second on ProMotion screens • Offset and round-trip time with sparkline history • Adaptive polling that eases off as a server proves steady [Pro — one-time purchase, no subscription] • Compare up to 30 servers. With three or more, a server that is off is outvoted instead of pulling the time shown. • Manual sync on demand • Keep the screen awake while the app is open A note on accuracy: a round trip is a single number covering two unknown halves, and nothing in the exchange reveals how it was divided. Prime Time widens the reported ± rather than inventing a correction to hide it. On cellular, where the two directions are least alike, that margin is wider — and shown. Made for developers, network engineers, and anyone curious about how far off their device's clock really is.

About

Atomic Exact Time

This app precisely calibrates your device's clock against internet time sources, accounting for network delays. It offers a full-screen display with millisecond accuracy, detailed reports on clock deviation, and a precision alarm. Ideal for professionals and enthusiasts requiring exact timing.

Highlights
  • Millisecond accurate clock display
  • Device offset status
  • Network latency and drift reports
  • Precision alarm
  • Timecode and markers
  • Widgets
  • Multiple clock themes
Features
Read full description

How many milliseconds is your device clock off? Atomic Exact Time compares your device with multiple internet time sources, accounts for network latency and outliers, then displays a calibrated live clock. Highlights: - Full-screen clock with milliseconds - Clear device-offset status - Offset, RTT, jitter, confidence and drift reports - Reference-time Precision Alarm - 24/25/30/50/60 fps timecode and markers - Widgets - Midnight, LED, Lab and Atomic themes - Synchronization history and CSV export - English and Turkish interface Built for broadcasters, event crews, athletes, labs, exams and anyone who needs to start on the exact second. Atomic Exact Time Pro unlocks automatic calibration, Precision Alarm, the full accuracy report, timecode, export, widget themes and every Pro appearance. The free experience includes banner ads; Pro removes all ads. Pro is available as a one-time Lifetime purchase or an auto-renewing monthly subscription with a 7-day free trial for eligible customers. The App Store shows the current localized price and billing period before confirmation. Subscription payment is charged to your Apple ID account and renews unless canceled at least 24 hours before the period ends. Manage or cancel a subscription in your App Store account settings. No account. No sale of personal data. Privacy: https://atomicexactime.shortmoxagency.com.tr/en/privacy Terms: https://atomicexactime.shortmoxagency.com.tr/en/terms Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Prime Time NTP4 screens
Atomic Exact Time4 screens

Verdict

The call

The clearest difference is iOS requirement: Atomic Exact Time at 16.4 against Prime Time NTP's 26.0. On price, rating, ratings volume and update cadence 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. Prime Time NTP sells 1 one-off in-app purchase and Atomic Exact Time sells 1 in-app purchase, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.0 for Prime Time NTP against 4.0 for Atomic Exact Time. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

UpkeepUpdate frequency

Prime Time NTP ships an update every 2 months, Atomic Exact Time every 6 weeks. The most recent releases landed on October 12, 2026 and October 14, 2026 respectively.

Scorecard1 real difference · 9 level
Prime Time NTP versus Atomic Exact Time: the parameters behind the verdict, then further details
ParameterPrime Time NTPAtomic Exact Time
PriceFreeFree
Rating4.0 (1 ratings)4.0 (1 ratings)
Positive reviews100.0% of reviews—
Number of ratings11
Update frequencyEvery 2 monthsEvery 6 weeks — better
AdsNoNo
In-app purchasesYesYes
MonetizationFreemiumFree with in-app purchases
DevicesiPhone, iPadiPhone, iPad, Mac — better
Requires iOS26.016.4 — better
Further details — not scored
Size11 MB46 MB
Age rating4+4+
DeveloperKentaro SaitoSUPER KIM KIMYA VE TEKSTIL SANAYI TICARET LIMITED SIRKETI

Customer experience

Prime Time NTP

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Atomic Exact Time

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

1 purchases

Prime Time NTP

One-time1
  • Premium Features$9.99
1 purchases

Atomic Exact Time

Subscriptions1
  • Atomic Exact Time Pro7 Days trial$2.991 Month

Questions

Is Prime Time NTP free?
Prime Time NTP is free to download, with in-app purchases available.
Is Atomic Exact Time free?
Atomic Exact Time is free to download, with in-app purchases available.
Which has better reviews, Prime Time NTP or Atomic Exact Time?
Prime Time NTP and Atomic Exact Time are both rated 4.0 out of 5 on the App Store, from 1 and 1 ratings respectively.
Do Prime Time NTP or Atomic Exact Time have ads?
Neither Prime Time NTP nor Atomic Exact Time shows ads.
Which is updated more often, Prime Time NTP or Atomic Exact Time?
Prime Time NTP ships an update every 2 months, and Atomic Exact Time every 6 weeks. Most recently, Prime Time NTP was updated on October 12, 2026 and Atomic Exact Time on October 14, 2026.

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