OLED Clock vs Fire Calculator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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!)
Fire Calculator
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⏱ ⏖Description⏖ Fire Calculator is designed for engineers, students and children. While boring technical calculations are done, the needed sense of having fun is provided on this calculator. This calculator is indispensable especially for mechanical engineering, civil engineering, chemical engineering, electrics engineering, mathematics professions. Fire Calculator can easily determine the mathematical expressions and correct if needed. By the help of hand-written exponential forms, you can easily see any mistakes in your mathematical expressions. Fire Calculator also has the functionality of seeing the history of your previous calculations by scrolling up. Furthermore, with the functionality of visual effects, users can do their mathematical affairs in an amazing and funny way of calculations. ⏱ ⏖Features⏖ ↪ Everything free ↪ Amazing interface with low battery usage ↪ Equation and Integral solving feature ↪ Exponential form as if hand-written mathematical expressions ↪ Copy-pasting of mathematical expressions ↪ Arithmetical operations, trigonometric and inverse-trigonometric functions, logarithmical and natural logarithmical operations, power operations, root operations, factorial operations, percentage calculations ↪ π and e numbers ↪ Using π symbol inside trigonometric functions ↪ Advantage of using the previous answer in the new expression ©2020 Burak Bilgin. All rights reserved.
Screenshots
Verdict
The clearest difference is update cadence: OLED Clock at every 4 weeks against Fire Calculator's every 65 months. OLED Clock also leads on device support and iOS requirement (12.0 vs 15.1). On price 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
OLED Clock ships an update every 4 weeks, Fire Calculator every 65 months. The most recent releases landed on October 13, 2026 and October 11, 2026 respectively.
| Parameter | OLED Clock | Fire Calculator |
|---|---|---|
| Price | Free | Free |
| Rating | 3.9 (15 ratings) — better | — |
| Positive reviews | 78.6% of reviews | — |
| Number of ratings | 15 — better | — |
| Update frequency | Every 4 weeks — better | Every 65 months |
| Ads | No | — |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod, Apple TV — better | — |
| Requires iOS | 12.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 10 MB | 37 MB |
| Age rating | 4+ | 4+ |
| Developer | Christian Moeller | Burak Bilgin |
In-app purchases
OLED Clock
No in-app purchases
Fire Calculator
No in-app purchases
Questions
Is OLED Clock free?
Is Fire Calculator free?
Which is updated more often, OLED Clock or Fire Calculator?
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