# Rotary 3055 vs ISOI

The clearest difference is update cadence: ISOI at weekly against Rotary 3055's every 5 months. ISOI also leads on iOS requirement (12.0 vs 14.0). 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.

Rotary 3055 ships an update every 5 months, ISOI weekly. The most recent releases landed on October 16, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Rotary 3055 | ISOI |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Weekly** |
| Size | 47 MB | 51 MB |
| Requires iOS | 14.0 | **12.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [cognisun](https://appshunter.io/developer/1006557176) | [Design Accent](https://appshunter.io/developer/1500554192) |

## What reviewers say

### Rotary 3055

[App page](https://appshunter.io/ios/app/rotary-3055/id6747573152)

**Features:** macOS Compatibility

**In-app purchases:** none


### ISOI

[App page](https://appshunter.io/ios/app/isoi/id6749447306)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Rotary 3055 free?

Rotary 3055 is free to download, with no in-app purchases.

### Is ISOI free?

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

### Do Rotary 3055 or ISOI have ads?

Neither Rotary 3055 nor ISOI shows ads.

### Which is updated more often, Rotary 3055 or ISOI?

Rotary 3055 ships an update every 5 months, and ISOI weekly. Most recently, Rotary 3055 was updated on October 16, 2026 and ISOI on October 8, 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.*