Comparison

Big Clock HD vs OLED Clock

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

Head to head
About

Big Clock HD

This app displays a large, easily readable digital clock on your device, perfect for viewing from afar. It supports all iOS locales and can prevent your device from auto-locking while the clock is displayed. Additional features include seconds display and widgets.

Highlights
  • Large, readable date and time display
  • Supports all iOS locales
  • Prevents auto-locking
  • Optional seconds display
  • Widgets
Features
Read full description

Big Clock HD displays a big digital clock on your iPhone / iPad that's readable even from a distance. All iOS locales are supported, change them in the settings for the app. If there's no big clock on the wall - now there's one in your pocket or in your iPad Dock! FEATURES - Big, readable display of date and time - Localized in all languages the iPhone/iPad supports - Prevents phone / iPad from auto-locking while displaying the time - Add seconds display via the Settings App - Widgets

About

OLED Clock

This app displays a dynamic clock designed to prevent OLED screen burn-in by constantly moving and changing colors. It offers customizable digital and analog views with various fonts, sizes, and animation speeds.

Highlights
  • OLED burn-in prevention
  • Animated clock movement
  • Color cycling
  • Digital and analog views
  • Customizable fonts and size
  • Adjustable animation speed
Features
Read full description

No burn-In! This clock is perfectly suited for the OLED display in iPhone X, because the clock won't stand still on the screen but moves around constantly using any available pixel of the screen over time. Also it smoothly changes color over the complete color spectrum, so that every sub pixel (red, green, blue) will be used evenly. This prevents the so called "burn-in effect" any OLED display shows, if certain pixels are switched on for a very long time. The clock not just works on iPhone X but on all iOS devices like iPhone, iPod Touch and iPad (iOS 9.3 and above). But there's more: - NEW: digital and analog representation of the clock. You choose! - choose between a huge number of nice looking fonts to display the actual time - adjust clocks size just by using the pinch gesture on main screen - use automatic color changes "color cycling" (recommended on iPhone x, can be switched off in settings) - adjust the clocks brightness by using scroll up and down gesture on the main screen - tap on the main screen to show tab bar at the bottom of the screen, here you will be able to switch between analog and digital view, call settings, help and about page - on settings page you can change font, color and animation speed as well as switch on/off seconds, blinking separators, 24h display, autosize and color cycling - all adjustments are permanent! OLED clock remembers them on the next time you use it! - use OLED clock in portrait or landscape mode. On digital mode, OLED clock remembers your preferred font size depending on device orientation - help page provides necessary information about usage - fully localized in english, german, hebrew, french and japanese (new!)

Screenshots

Big Clock HD4 screens
OLED Clock4 screens

Verdict

The call

The clearest difference is price: OLED Clock at Free against Big Clock HD's $0.49. OLED Clock also leads on rating (3.9 vs 3.0) and review sentiment (79% vs 45%). On ratings volume, ads, in-app purchases and monetization model 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

OLED Clock is free to download; Big Clock HD costs $0.49 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

OLED Clock holds the better App Store score, 3.9 against 3.0. Both are backed by a comparable volume of ratings — 23 and 15 respectively. Written reviews point the same way: 45% of Big Clock HD's written reviews are positive against 79% of OLED Clock's.

UpkeepUpdate frequency

Big Clock HD ships an update every 29 months, OLED Clock every 4 weeks. The most recent releases landed on October 13, 2026 and October 7, 2026 respectively.

Scorecard5 real differences · 5 level
Big Clock HD versus OLED Clock: the parameters behind the verdict, then further details
ParameterBig Clock HDOLED Clock
Price$0.49Free — better
Rating3.0 (23 ratings)3.9 (15 ratings) — better
Positive reviews45.5% of reviews78.6% of reviews — better
Number of ratings23 — better15
Update frequencyEvery 29 monthsEvery 4 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPod, Mac, Apple TV — betteriPhone, iPad, iPod, Apple TV
Requires iOS14.012.0 — better
Further details — not scored
Size1 MB10 MB
Age rating4+4+
DeveloperTheCodingMonkeysChristian Moeller

Customer experience

Big Clock HD

All ratings23 ratings
Positive47.8%
Neutral4.3%
Negative47.8%
Written reviews44 reviews
Positive45.5%
Neutral13.6%
Negative40.9%

OLED Clock

All ratings15 ratings
Positive66.7%
Neutral13.3%
Negative20.0%
Written reviews28 reviews
Positive78.6%
Neutral7.1%
Negative14.3%

In-app purchases

None

Big Clock HD

No in-app purchases

None

OLED Clock

No in-app purchases

Questions

Is Big Clock HD free?
Big Clock HD costs $0.49, with no in-app purchases.
Is OLED Clock free?
OLED Clock is free to download, with no in-app purchases.
Which has better reviews, Big Clock HD or OLED Clock?
OLED Clock is rated higher. Big Clock HD averages 3.0 out of 5 from 23 ratings, while OLED Clock averages 3.9 from 15 ratings.
Do Big Clock HD or OLED Clock have ads?
Neither Big Clock HD nor OLED Clock shows ads.
Which is updated more often, Big Clock HD or OLED Clock?
Big Clock HD ships an update every 29 months, and OLED Clock every 4 weeks. Most recently, Big Clock HD was updated on October 13, 2026 and OLED Clock on October 7, 2026.

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