Comparison

Atomic Clock PRO vs OLEDX

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

Head to head
About

Atomic Clock PRO

Get the most accurate time from an official atomic clock server. This app automatically detects your time zone and allows custom backgrounds. Easily switch between digital and analog clock displays with a swipe.

Highlights
  • Exact time from atomic clock
  • Automatic time zone recognition
  • Customizable background images
  • Digital and analog clock modes
  • Optional sound alerts
  • Color customization
Features
Read full description

Get accurate time on your iPhone and iPad by syncing with an official atomic clock time server. Download now for free! If you want exact time, a precise time reference, or an easy-to-read clock display, this app is designed for that. It automatically recognizes your time zone, lets you use one of your own photos as the background, and lets you switch between a digital display and a classic analog clock with a simple swipe. It is ideal as a personalized desk clock, a reliable travel companion, an everyday reference clock, or when you need exact time to set a mechanical watch accurately. Overview: - Accurate and precise time synced from an official atomic clock time server - Automatically recognizes your time zone and shows the current local time - Choose digital, analog, or combined analog and digital clock displays - Swipe to switch between clock displays - Resize the digital clock for a larger or smaller display - Includes time (hours, minutes, and seconds), date, and day of the week (optional) - Optional sound every second or every minute - Change clock and background colors - Use your own photos as background images - Choose atomic clock sync or your device's system clock - Option to keep the screen awake while the app is open - Works in portrait and landscape mode - For iPhone and iPad Helpful for: - A personalized desk clock at home or at work - Getting the correct local time while traveling - Setting a mechanical watch accurately - A clear reference clock when you want accurate, easy-to-read time PLEASE NOTE: You can switch between the analog and digital clock by swiping left or right across the clock. Disclaimer: Please note that whilst all reasonable care has been taken to make this application as accurate as possible we can not guarantee 100% accuracy. Standard Apple Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

OLEDX

Enhance your iPhone's OLED display with a customizable clock and information interface. View time, weather, battery, personal notes, and icons with energy-efficient, visually striking designs. Features include dual time zones, analog/digital clocks, and adjustable brightness.

Highlights
  • Display Time and Date
  • Current Weather Face
  • Display Battery Information
  • Display Icon or Personal Note
  • Dual Time Zone Interface
  • Analog Or Digital Clock
  • Energy Efficient
  • Multiple Watch Faces
Features
Read full description

A simple Clock/Information Interface made to take advantage of the iPhone OLED displays. Keep track of time, add a personal note, check the weather, add icons or images to the Information Interface. The interface takes minor jumps each minute (3 pixels), this is built as a safety measure for OLED panels. OLEDX is highly energy efficient. By using the most efficient methods to accomplish its main purpose OLEDX achieves very low power consumption. The iPhone OLED screens make it possible to have zero light emitting from pixels that are not being used, the entire screen will look completely dark while the information interface pixels will emit light. Features: -Display Time and Date -Current Weather Face -Display Battery Information -Display Icon or Personal Note -Display Icon -Dual Time Zone Interface -Analog Or Digital Clock -Proximity Sensor Monitoring -Energy Efficient -Multiple Watch Faces -Face color customization -Star Roofs -Adjust brightness of the interface by panning up and down across it. And more. Star roofs once set will go into a slide show mode and will loop through the set. This is done in order to prevent a single roof from being displayed for extended periods of time. The Settings button shows on and off when you first enter the app, but you can tap on that position of the screen anytime to access the settings menu. Screen brightness can be adjusted by panning up and down with your finger across the interface.

Screenshots

Atomic Clock PRO4 screens
OLEDX4 screens

Verdict

The call

The clearest difference is ads: OLEDX at none against Atomic Clock PRO's shown. OLEDX also leads on iOS requirement (13.0 vs 15.6). Atomic Clock PRO's advantage is review sentiment (73% vs 49%) and update cadence (every 3 months vs every 10 months). On price, rating, ratings volume and in-app purchases 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. Atomic Clock PRO sells 2 in-app purchases, starting at $1.99 per month and OLEDX sells 1 one-off in-app purchase. 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 — 4.7 for Atomic Clock PRO against 4.6 for OLEDX. Both are backed by a comparable volume of ratings — 10K and 5.2K respectively. Written reviews are what separate them: 73% of Atomic Clock PRO's written reviews are positive against 49% of OLEDX's.

UpkeepUpdate frequency

Atomic Clock PRO ships an update every 3 months, OLEDX every 10 months. Both last shipped on September 25, 2026.

Scorecard4 real differences · 6 level
Atomic Clock PRO versus OLEDX: the parameters behind the verdict, then further details
ParameterAtomic Clock PROOLEDX
PriceFreeFree
Rating4.7 (10K ratings) — better4.6 (5.2K ratings)
Positive reviews72.7% of reviews — better48.7% of reviews
Number of ratings10K — better5.2K
Update frequencyEvery 3 months — betterEvery 10 months
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS15.613.0 — better
Further details — not scored
Size6 MB7 MB
Age rating4+4+
DeveloperBrachmann Online Marketing GmbH & Co. KGRonan Stark

Customer experience

Atomic Clock PRO

All ratings10,111 ratings
Positive92.3%
Neutral3.5%
Negative4.2%
Written reviews421 reviews
Positive72.7%
Neutral6.2%
Negative21.1%

OLEDX

All ratings5,161 ratings
Positive90.5%
Neutral5.1%
Negative4.4%
Written reviews530 reviews
Positive48.7%
Neutral13.4%
Negative37.9%

User reviews

Atomic Clock PRO

From 10K App Store ratings

What we love

  • ⭐ Accurate time display
  • 📟 Useful for timing events
  • 🕰️ Helpful for setting other clocks
  • 🔍 Large, easy-to-read clock face

Room to improve

  • 💸 Subscription model for ad-free version
  • 📢 Excessive advertisements
  • 🔍 Small font for seconds display
  • 🔀 Difficulty in displaying both analog and digital clocks simultaneously

OLEDX

From 5.2K App Store ratings

What we love

  • 👍 Nice display
  • 👍 Good for nightstand use
  • 👍 Customizable clock faces
  • 👍 Works well on iPhone
  • 👍 Useful app

Room to improve

  • 🐛 Screen turns off after a while
  • 🔋 Battery drain issues
  • 🐛 Notifications not working
  • 🐛 Time not syncing correctly
  • 🐛 Paid features not working as expected

Bugs and requests

Atomic Clock PRO

Reported bugs

3 issues
  • Second hand occasionally runs in reverse
  • Digital clock display cuts off on some devices
  • Inconsistent behavior when switching between clock types

Requested features

3 requests
  • Customizable clock face options
  • Ability to set widget on home screen
  • Sync with system clock to automatically update time

OLEDX

Reported bugs

4 issues
  • Screen goes black after some time
  • Time display not accurate
  • Paid features not working
  • Compatibility issues with newer iPhones

Requested features

5 requests
  • Add weather information
  • Allow custom wallpapers
  • Improve alarm functionality
  • Add notification support
  • Improve brightness/dimming controls

In-app purchases

2 purchases

Atomic Clock PRO

Subscriptions1
  • Premium$1.991 Month
One-time1
  • Remove Ads$5.99
1 purchases

OLEDX

One-time1
  • OLEDX Premium$3.99

Questions

Is Atomic Clock PRO free?
Atomic Clock PRO is free to download, with in-app purchases available.
Is OLEDX free?
OLEDX is free to download, with in-app purchases available.
Which has better reviews, Atomic Clock PRO or OLEDX?
Atomic Clock PRO is rated higher. Atomic Clock PRO averages 4.7 out of 5 from 10K ratings, while OLEDX averages 4.6 from 5.2K ratings.
Do Atomic Clock PRO or OLEDX have ads?
Atomic Clock PRO shows ads; OLEDX does not.
Which is updated more often, Atomic Clock PRO or OLEDX?
Atomic Clock PRO ships an update every 3 months, and OLEDX every 10 months. Most recently, Atomic Clock PRO was updated on September 25, 2026 and OLEDX on September 25, 2026.

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