# Умный Дизайн vs Length Converter

The clearest difference is in-app purchases: Умный Дизайн at none against Length Converter's 2. Умный Дизайн also leads on ads (none vs shown) and update cadence (fortnightly vs every 10 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Length Converter sells 2 in-app purchases, starting at $4.99 per month. Умный Дизайн asks for nothing beyond the download.

Умный Дизайн ships an update fortnightly, Length Converter every 10 months. The most recent releases landed on October 7, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | Умный Дизайн | Length Converter |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Fortnightly** | Every 10 months |
| Size | 71 MB | 28 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Alex Kozachenko](https://appshunter.io/developer/1447875502) | [kota tada](https://appshunter.io/developer/1658942612) |

## What reviewers say

### Умный Дизайн

[App page](https://appshunter.io/ios/app/id6466181904)

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

**In-app purchases:** none


### Length Converter

[App page](https://appshunter.io/ios/app/length-converter-lencon/id6743503521)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Ad-free for 1 month | $4.99 | per month |
| Ad-free for 1 year | $49.99 | per year |


## Frequently asked questions

### Is Умный Дизайн free?

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

### Is Length Converter free?

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

### Do Умный Дизайн or Length Converter have ads?

Length Converter shows ads; Умный Дизайн does not.

### Which is updated more often, Умный Дизайн or Length Converter?

Умный Дизайн ships an update fortnightly, and Length Converter every 10 months. Most recently, Умный Дизайн was updated on October 7, 2026 and Length Converter on October 13, 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.*