# RainbowCalc vs SandyCal

The clearest difference is ads: SandyCal at none against RainbowCalc's shown. SandyCal also leads on update cadence (every 2 days vs fortnightly). RainbowCalc's advantage is device support (3 vs 1) and iOS requirement (15.1 vs 26.2). On price and in-app purchases there is nothing between them.

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

RainbowCalc ships an update fortnightly, SandyCal every 2 days. The most recent releases landed on October 2, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | RainbowCalc | SandyCal |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Fortnightly | **Every 2 days** |
| Size | 34 MB | 1 MB |
| Requires iOS | **15.1** | 26.2 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Andre Silva](https://appshunter.io/developer/1719182490) | [Hiroyuki Akaji](https://appshunter.io/developer/1886302301) |

## What reviewers say

### RainbowCalc

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

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

**In-app purchases:** none


### SandyCal

[App page](https://appshunter.io/ios/app/sandycal/id6760809812)

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

**In-app purchases:** none


## Frequently asked questions

### Is RainbowCalc free?

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

### Is SandyCal free?

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

### Do RainbowCalc or SandyCal have ads?

RainbowCalc shows ads; SandyCal does not.

### Which is updated more often, RainbowCalc or SandyCal?

RainbowCalc ships an update fortnightly, and SandyCal every 2 days. Most recently, RainbowCalc was updated on October 2, 2026 and SandyCal on October 1, 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.*