Comparison

Big clock 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

A simple utility app offering a large digital clock and stopwatch functionality. It features customizable backgrounds to suit day or night viewing.

Highlights
  • Digital clock display
  • Stopwatch functionality
  • Day mode background
  • Night mode background
  • White background option
  • Black background option
Features
Read full description

This is a Big clock with stopwatch. changing digital clock or stopwatch changing background for day or night mode ---Function--- +digital clock +stopwatch --Background---- +white +Black

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 clock3 screens
OLED Clock4 screens

Verdict

The call

The clearest difference is rating: OLED Clock at 3.9 against Big clock's 2.1. OLED Clock also leads on review sentiment (79% vs 43%). Big clock's advantage is iOS requirement (8.1 vs 12.0). On price, ratings volume, update cadence and ads 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.

ReceptionRating · Positive reviews · Number of ratings

OLED Clock holds the better App Store score, 3.9 against 2.1. Both are backed by a comparable volume of ratings — 7 and 15 respectively. Written reviews point the same way: 43% of Big clock's written reviews are positive against 79% of OLED Clock's.

UpkeepUpdate frequency

Big clock ships an update every 2 weeks, OLED Clock every 4 weeks. The most recent releases landed on November 1, 2026 and November 2, 2026 respectively.

Scorecard3 real differences · 7 level
Big clock versus OLED Clock: the parameters behind the verdict, then further details
ParameterBig clockOLED Clock
PriceFreeFree
Rating2.1 (7 ratings)3.9 (15 ratings) — better
Positive reviews43.5% of reviews78.6% of reviews — better
Number of ratings715 — better
Update frequencyEvery 2 weeks — betterEvery 4 weeks
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPodiPhone, iPad, iPod, Apple TV — better
Requires iOS8.1 — better12.0
Further details — not scored
Size4 MB10 MB
Age rating4+4+
DeveloperSakura appsChristian Moeller

Customer experience

Big clock

All ratings7 ratings
Positive14.3%
Neutral14.3%
Negative71.4%
Written reviews23 reviews
Positive43.5%
Neutral8.7%
Negative47.8%

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

No in-app purchases

None

OLED Clock

No in-app purchases

Questions

Is Big clock free?
Big clock is free to download, 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 or OLED Clock?
OLED Clock is rated higher. Big clock averages 2.1 out of 5 from 7 ratings, while OLED Clock averages 3.9 from 15 ratings.
Do Big clock or OLED Clock have ads?
Neither Big clock nor OLED Clock shows ads.
Which is updated more often, Big clock or OLED Clock?
Big clock ships an update every 2 weeks, and OLED Clock every 4 weeks. Most recently, Big clock was updated on November 1, 2026 and OLED Clock on November 2, 2026.

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