# Rotational Speed Converter vs ИМ. Инженер

The clearest difference is price: ИМ. Инженер at Free against Rotational Speed Converter's $1.99. ИМ. Инженер also leads on update cadence (weekly vs every 10 months). Rotational Speed Converter's advantage is iOS requirement (15.6 vs 17.6). On ads, in-app purchases and device support there is nothing between them.

ИМ. Инженер is free to download; Rotational Speed Converter costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Rotational Speed Converter ships an update every 10 months, ИМ. Инженер weekly. The most recent releases landed on November 6, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Rotational Speed Converter | ИМ. Инженер |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 10 months | **Weekly** |
| Size | 1 MB | 17 MB |
| Requires iOS | **15.6** | 17.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Kei Suefuji](https://appshunter.io/developer/1388335881) | [Manasin Ivan](https://appshunter.io/developer/1826578516) |

## What reviewers say

### Rotational Speed Converter

[App page](https://appshunter.io/ios/app/rotational-speed-converter/id1388335882)

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

**In-app purchases:** none


### ИМ. Инженер

[App page](https://appshunter.io/ios/app/id6748615607)

**In-app purchases:** none


## Frequently asked questions

### Is Rotational Speed Converter free?

Rotational Speed Converter costs $1.99, with no in-app purchases.

### Is ИМ. Инженер free?

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

### Do Rotational Speed Converter or ИМ. Инженер have ads?

Neither Rotational Speed Converter nor ИМ. Инженер shows ads.

### Which is updated more often, Rotational Speed Converter or ИМ. Инженер?

Rotational Speed Converter ships an update every 10 months, and ИМ. Инженер weekly. Most recently, Rotational Speed Converter was updated on November 6, 2026 and ИМ. Инженер on October 30, 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.*