NilnocCalc vs RainbowCalc
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
NilnocCalc
A powerful 64-bit calculator with multiple number system displays, trigonometric functions, and customizable button colors. It offers unit conversions, binary float display, and permutation/combination calculations.
- 64-bit calculation engine
- Hex, Octal, Binary displays
- Full trigonometric functions
- Customizable button colors and effects
- Unit conversion constants
- Binary Float display
- Combinations and Permutations
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This fully functioning 64 bit Calculator features 10 registers to save values. Hex, Oct, Bin displays. Full set of Trig functions. Users can customize: The colors of buttons and effects ( border and gradient ) The number of digits displayed to the right of the decimal. When Scientific Notation is used for display. Also contains many standard unit conversion constants. Also includes a Binary Float display . Combinations and Permutation calculations built in.
RainbowCalc
This calculator app offers extensive customization with a wide color picker for backgrounds and keys, enhancing usability and accessibility. It includes a calculation history with sharing options and supports basic arithmetic, percentages, and square roots.
- Customizable background and key colors
- Advanced color picker
- Calculation history
- Share calculations
- Basic operations
- Percentage calculations
- Square root calculations
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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 rating: NilnocCalc at 5.0 against RainbowCalc's 2.0. NilnocCalc also leads on ads (none vs shown) and monetization model (free vs ad-supported). RainbowCalc's advantage is update cadence (fortnightly vs every 3 months). On price, ratings volume, 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.
NilnocCalc holds the better App Store score, 5.0 against 2.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively.
NilnocCalc ships an update every 3 months, RainbowCalc fortnightly. The most recent releases landed on November 1, 2026 and October 27, 2026 respectively.
| Parameter | NilnocCalc | RainbowCalc |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | 2.0 (1 ratings) |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 1 | 1 |
| Update frequency | Every 3 months | Fortnightly — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free — better | Ad-supported |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 5 MB | 34 MB |
| Age rating | 4+ | 4+ |
| Developer | John Conlin | Andre Silva |
In-app purchases
NilnocCalc
No in-app purchases
RainbowCalc
No in-app purchases








