# Idus IS vs Rotation

The clearest difference is in-app purchases: Idus IS at none against Rotation's 2. Idus IS also leads on iOS requirement (13.0 vs 17.0). Rotation's advantage is update cadence (every 4 days vs every 3 months). On price, ads and device support there is nothing between them.

Both are free to download. Rotation sells 2 one-off in-app purchases. Idus IS asks for nothing beyond the download.

Idus IS ships an update every 3 months, Rotation every 4 days. The most recent releases landed on October 29, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | Idus IS | Rotation |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 4 days** |
| Size | 136 MB | 2 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [IDUS AB](https://appshunter.io/developer/780399497) | [DANIEL MATTIAS FOGELL](https://appshunter.io/developer/6816885055) |

## What reviewers say

### Idus IS

[App page](https://appshunter.io/ios/app/idus-is/id780399494)

**Features:** macOS Compatibility

**In-app purchases:** none


### Rotation

[App page](https://appshunter.io/ios/app/rotation-schedule-and-certs/id6817844616)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 7-day Trial | Free | one-time |
| Rotation full version | $14.99 | one-time |


## Frequently asked questions

### Is Idus IS free?

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

### Is Rotation free?

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

### Do Idus IS or Rotation have ads?

Neither Idus IS nor Rotation shows ads.

### Which is updated more often, Idus IS or Rotation?

Idus IS ships an update every 3 months, and Rotation every 4 days. Most recently, Idus IS was updated on October 29, 2026 and Rotation on November 6, 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.*