Comparison

Atomic Clock vs NTP Inspector

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

Head to head
About

Atomic Clock

Features
Read full description

Always know the exact time with Atomic Clock – Precise Time. Our app synchronizes with official atomic time servers to deliver ultra-accurate time down to the millisecond. Whether you’re coordinating across time zones, managing scientific experiments, or simply want the most reliable clock, this app provides unmatched precision. Features: - Real-time synchronization with global atomic clock servers - 24-hour and 12-hour display options - Beautiful, minimal clock face with dark mode - Works online and offline with last known atomic time - Perfect for professionals, travelers, pilots, scientists, and anyone who values absolute accuracy. An atomic clock is a timekeeping device that measures time based on the vibrations or transitions of atoms—usually cesium or rubidium. Unlike mechanical or quartz clocks, which rely on moving parts or crystals, atomic clocks use the natural oscillations of atoms as their frequency standard. This makes them the most accurate clocks ever developed, capable of maintaining time to within a few billionths of a second per day. Atomic clocks are essential for applications where extreme precision is required, such as GPS navigation, telecommunications, space exploration, scientific experiments, and synchronizing global networks.

About

NTP Inspector

This utility app allows you to query NTP servers on the internet and view detailed information from their responses. It helps troubleshoot server issues by providing protocol version, stratum, reference time, and leap second status directly from your device.

Highlights
  • Query NTP servers
  • View protocol version
  • Check server stratum
  • Report reference time
  • Detect leap seconds
  • Troubleshoot network issues
Features
Read full description

NTP Inspector is an application that allows you to check servers running the NTP protocol over the Internet and report some basic information. It sends an NTP packet from your device to the server and reports backs almost everything included in the response, like the protocol version, mode, the server Stratum, its precision, reference time, as well as whether there is a leap second today or not. With this app you can troubleshoot NTP servers from anywhere, as seen from your device, and not a remote server, with complete privacy. The app was created when I received an alert for one of my NTP pool servers while outside and without laptop access, with no other option to query it to see what's wrong.

Screenshots

Atomic Clock3 screens
NTP Inspector4 screens

Verdict

The call

The clearest difference is iOS requirement: Atomic Clock at 15.1 against NTP Inspector's 18.0. On price, ads, in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.

Scorecard1 real difference · 9 level
Atomic Clock versus NTP Inspector: the parameters behind the verdict, then further details
ParameterAtomic ClockNTP Inspector
PriceFreeFree
Rating—5.0 (2 ratings) — better
Positive reviews—100.0% of reviews
Number of ratings—2 — better
Update frequency—Monthly
AdsNoNo
In-app purchasesNoNo
Monetization—Free
DevicesiPhone, iPodiPhone, iPad
Requires iOS15.1 — better18.0
Further details — not scored
Size29 MB3 MB
Age rating4+4+
DeveloperSTAN I. C. ALEXANDRU PERSOANA FIZICA AUTORIZATAAntonios Chariton

In-app purchases

None

Atomic Clock

No in-app purchases

None

NTP Inspector

No in-app purchases

Questions

Is Atomic Clock free?
Atomic Clock is free to download, with no in-app purchases.
Is NTP Inspector free?
NTP Inspector is free to download, with no in-app purchases.
Do Atomic Clock or NTP Inspector have ads?
Neither Atomic Clock nor NTP Inspector shows ads.

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