# Custom Real vs RainbowCalc

The clearest difference is update cadence: Custom Real at every 3 days against RainbowCalc's fortnightly. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Custom Real ships an update every 3 days, RainbowCalc fortnightly. Both last shipped on October 27, 2026.

## The numbers

| Metric | Custom Real | RainbowCalc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[2.0 (1 ratings)](https://appshunter.io/ios/app/rainbowcalc/id6479331134/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | **Every 3 days** | Fortnightly |
| Monetization | — | Ad-supported |
| Size | 5 MB | 34 MB |
| Requires iOS | **14.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [kenta hamazaki](https://appshunter.io/developer/1589193489) | [Andre Silva](https://appshunter.io/developer/1719182490) |

## What reviewers say

### Custom Real

[App page](https://appshunter.io/ios/app/custom-real-time-calculator/id6449462897)

**Features:** macOS Compatibility

**In-app purchases:** none


### RainbowCalc

[App page](https://appshunter.io/ios/app/rainbowcalc/id6479331134)

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.

**Highlights:** Customizable background and key colors, Advanced color picker, Calculation history, Share calculations, Basic operations, Percentage calculations, Square root calculations

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Custom Real free?

Custom Real is free to download, with no in-app purchases.

### Is RainbowCalc free?

RainbowCalc is free to download, with no in-app purchases.

### Do Custom Real or RainbowCalc have ads?

Both Custom Real and RainbowCalc show ads.

### Which is updated more often, Custom Real or RainbowCalc?

Custom Real ships an update every 3 days, and RainbowCalc fortnightly. Most recently, Custom Real was updated on October 27, 2026 and RainbowCalc on October 27, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*