# RAINBOW ISC vs Note Calendar

The clearest difference is update cadence: Note Calendar at every 2 months against RAINBOW ISC's every 6 months. RAINBOW ISC's advantage is device support (3 vs 1) and iOS requirement (11.0 vs 26.0). On price, ads 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.

RAINBOW ISC ships an update every 6 months, Note Calendar every 2 months. The most recent releases landed on October 27, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | RAINBOW ISC | Note Calendar |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 2 months** |
| Size | 38 MB | 19 MB |
| Requires iOS | **11.0** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [RAINBOW YAZILIM ELEKTRONIK PEYZAJ ANONIM SIRKETI](https://appshunter.io/developer/1676142984) | [Berkay Sancar](https://appshunter.io/developer/1673046007) |

## What reviewers say

### RAINBOW ISC

[App page](https://appshunter.io/ios/app/rainbow-isc/id1558876894)

**Features:** macOS Compatibility

**In-app purchases:** none


### Note Calendar

[App page](https://appshunter.io/ios/app/note-calendar-task-reminder/id1673046005)

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

**In-app purchases:** none


## Frequently asked questions

### Is RAINBOW ISC free?

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

### Is Note Calendar free?

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

### Do RAINBOW ISC or Note Calendar have ads?

Neither RAINBOW ISC nor Note Calendar shows ads.

### Which is updated more often, RAINBOW ISC or Note Calendar?

RAINBOW ISC ships an update every 6 months, and Note Calendar every 2 months. Most recently, RAINBOW ISC was updated on October 27, 2026 and Note Calendar on October 24, 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.*