# AtomicClock: NTP Time

> Precision Clock, UTC Reference

Canonical page: [https://chrome-stats.com/d/id1402993049](https://chrome-stats.com/d/id1402993049)

## Overview

- **ID:** `id1402993049`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** Timo Partl
- **Category:** Utilities
- **Rating:** 4.80 / 5 (5,540 ratings)
- **Version:** 3.6.24
- **Last updated:** 2026-09-19
- **First published:** 2018-07-25
- **Size:** 17 MB
- **Data as of:** 2026-09-23
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/atomicclock-ntp-time/id1402993049)
- **Website:** [https://atomicclock.app/](https://atomicclock.app/)
- **Privacy policy:** [https://atomicclock.app/privacypolicy](https://atomicclock.app/privacypolicy)

## Description

**AtomicClock: NTP Time** provides a clear local or UTC reference using time retrieved from NTP servers connected to atomic-clock references. View the time with customizable analog and digital clocks, selectable clock faces and hands, 12-hour or 24-hour formats, smooth seconds, ticking sounds, and the Greenwich Time Signal.

Use AtomicClock to check timestamps, set watches and wall clocks, prepare cameras, or compare time across devices. Technical details include round-trip time and server stratum. The free app includes optional AtomicClock Pro, a one-time purchase that removes ads and unlocks additional customization. AtomicClock displays reference time for comparison and does not change your device’s system time.

## Rankings

- #24,274 — Overall
- #91 — clock

## Review summary

Users value AtomicClock for precise NTP time and rich customization, with strong daily usefulness for calibrating watches. The main drawback across reviews is intrusive advertising: banner and full-page ads, trial versions, and aggressive ad tactics that can render the app unusable. A subset notes occasional issues with pro upgrades or payments. Overall sentiment centers on solid timekeeping and features marred by monetization-focused UX.

### Pros

- Precise timekeeping with NTP and support for multiple time servers, delivering very high accuracy (even to 1/100 second).
- Rich, customizable clock designs and display options that users find appealing and versatile.
- Very useful for calibrating and setting watches/clocks on a daily basis, including astronomical timing use.
- One-time, non-subscription purchase for pro features (deemed good value by users).

### Cons

- Intrusive advertising: banners and full-page ads that cover the clock and degrade readability.
- Trial/free versions that are unusable due to ads; ads interrupt core functionality before purchase.
- Aggressive ad tactics, including misleading prompts or pushes to click ads and update prompts.
- Some users report instability upgrading to pro or paying through certain accounts; ad-driven monetization as the main friction.

## Similar extensions and apps

- [Atomic Clock – Precision Time](https://chrome-stats.com/d/id6760377377) — 4.80 / 5
- [Real-Time Atomic Clock](https://chrome-stats.com/d/id6754537526)
- [Atomic Clock: Exact Time](https://chrome-stats.com/d/id6752546454) — 1.00 / 5
- [Atomic Clock PRO](https://chrome-stats.com/d/id899090224) — 4.70 / 5
- [TrueOffset](https://chrome-stats.com/d/id6757518499) — 4.80 / 5
- [Prime Time NTP](https://chrome-stats.com/d/id6759555624) — 4.00 / 5
- [Atomic Clock (Gorgy Timing)](https://chrome-stats.com/d/id295302256) — 4.80 / 5
- [Atomic Clock App](https://chrome-stats.com/d/id6760158311)
- [Time Calibrator](https://chrome-stats.com/d/id786988278) — 2.70 / 5
- [Simple Clock - Hybrid Clock](https://chrome-stats.com/d/id1548930970) — 1.00 / 5
- [AccurateClock](https://chrome-stats.com/d/id6767766624)
- [STEADYWATCH™ HANDHELD](https://chrome-stats.com/d/id6755752518) — 5.00 / 5

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Source: [Chrome-Stats](https://chrome-stats.com/d/id1402993049)