Big Clock HD vs OLED Clock
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Large, readable date and time display
- Supports all iOS locales
- Prevents auto-locking
- Optional seconds display
- Widgets
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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
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.
- OLED burn-in prevention
- Animated clock movement
- Color cycling
- Digital and analog views
- Customizable fonts and size
- Adjustable animation speed
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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
Verdict
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
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.
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.
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.
| Parameter | Big Clock HD | OLED Clock |
|---|---|---|
| Price | $0.49 | Free — better |
| Rating | 3.0 (23 ratings) | 3.9 (15 ratings) — better |
| Positive reviews | 45.5% of reviews | 78.6% of reviews — better |
| Number of ratings | 23 — better | 15 |
| Update frequency | Every 29 months | Every 4 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod, Mac, Apple TV — better | iPhone, iPad, iPod, Apple TV |
| Requires iOS | 14.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 1 MB | 10 MB |
| Age rating | 4+ | 4+ |
| Developer | TheCodingMonkeys | Christian Moeller |
Customer experience
Big Clock HD
OLED Clock
In-app purchases
Big Clock HD
No in-app purchases
OLED Clock
No in-app purchases
Questions
Is Big Clock HD free?
Is OLED Clock free?
Which has better reviews, Big Clock HD or OLED Clock?
Do Big Clock HD or OLED Clock have ads?
Which is updated more often, Big Clock HD or OLED Clock?
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