addition calc vs RainbowCalc
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
addition calc
This calculator app clearly displays inputs and sums on separate rows for easy understanding. Perform basic arithmetic operations with large, accessible buttons. Customize decimal places and rounding for precise calculations.
- Separate input and sum display
- Large buttons for easy input
- Supports four input operations
- Customizable decimal places
- Adjustable rounding settings
- Optional vibration feedback
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The input (lower row) and the sum (upper row) are separated, so you can always understand the answer. How to use is simple, just enter the numbers and press the add button. Four input operations can be performed on the input (lower row), and the results can be added. You can set the total number of decimal places and rounding. You can also activate the vibrator when you touch the iPhone.
RainbowCalc
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It has large numbers for easy visualization and better usability and accessibility! Easy to use and with easily readable characters! With this customizable calculator, it is possible to change the background and numeric key colors to the ones you like the most, bringing more visual comfort to the user. Thanks to the advanced color picker, you can choose any color! Combine colors with your phone case or device color, stand out with your unique customization. No more limited themes and colors chosen for you! Choose your favorite theme yourself. It also features a history of all calculations, where you can delete them individually or all at once, and the ability to share a calculation via messaging apps. Download this great, lightweight, beautiful, and personalized calculator for free now. • All colors are possible! • Combine colors with your style. • Calculation history and sharing. • Basic operations. • Percentage calculations. • Square root calculations.
Screenshots
Verdict
The clearest difference is ads: addition calc at none against RainbowCalc's shown. addition calc also leads on iOS requirement (9.3 vs 15.1). RainbowCalc's advantage is update cadence (fortnightly vs monthly). On price, in-app purchases and device support 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.
addition calc ships an update monthly, RainbowCalc fortnightly. The most recent releases landed on October 11, 2026 and October 24, 2026 respectively.
| Parameter | addition calc | RainbowCalc |
|---|---|---|
| Price | Free | Free |
| Rating | — | 2.0 (1 ratings) — better |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | — | 1 — better |
| Update frequency | Monthly | Fortnightly — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 9.3 — better | 15.1 |
| Further details — not scored | ||
| Size | 13 MB | 34 MB |
| Age rating | 4+ | 4+ |
| Developer | Shozo Obayashi | Andre Silva |
In-app purchases
addition calc
No in-app purchases
RainbowCalc
No in-app purchases
