# RainbowCalc vs Deadlines reminder

The clearest difference is in-app purchases: RainbowCalc at none against Deadlines reminder's 1. RainbowCalc also leads on update cadence (fortnightly vs every 2 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Deadlines reminder sells 1 in-app purchase, starting at $2.99 per year. RainbowCalc asks for nothing beyond the download.

RainbowCalc ships an update fortnightly, Deadlines reminder every 2 months. Both last shipped on October 18, 2026.

## The numbers

| Metric | RainbowCalc | Deadlines reminder |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | **Fortnightly** | Every 2 months |
| Size | 34 MB | 51 MB |
| Requires iOS | **15.1** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Andre Silva](https://appshunter.io/developer/1719182490) | [Thomas Sambugaro](https://appshunter.io/developer/1654147996) |

## What reviewers say

### RainbowCalc

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

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

**In-app purchases:** none


### Deadlines reminder

[App page](https://appshunter.io/ios/app/deadlines-reminder/id6741763061)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro version | $2.99 | per year |


## Frequently asked questions

### Is RainbowCalc free?

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

### Is Deadlines reminder free?

Deadlines reminder is free to download, with in-app purchases available.

### Do RainbowCalc or Deadlines reminder have ads?

Both RainbowCalc and Deadlines reminder show ads.

### Which is updated more often, RainbowCalc or Deadlines reminder?

RainbowCalc ships an update fortnightly, and Deadlines reminder every 2 months. Most recently, RainbowCalc was updated on October 18, 2026 and Deadlines reminder on October 18, 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.*