# Умный Дизайн vs Lett

The clearest difference is in-app purchases: Умный Дизайн at none against Lett's 7. Умный Дизайн also leads on iOS requirement (15.0 vs 17.0). Lett's advantage is update cadence (every 5 days vs fortnightly). On price, ads and device support there is nothing between them.

Both are free to download. Lett sells 7 in-app purchases, starting at $1.99 per 7 days. Умный Дизайн asks for nothing beyond the download.

Умный Дизайн ships an update fortnightly, Lett every 5 days. The most recent releases landed on October 7, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Умный Дизайн | Lett |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.7 (7 ratings)](https://appshunter.io/ios/app/lett-instagram-carousel-post/id6752947168/reviews)** |
| Number of ratings | — | **7** |
| Positive reviews | — | 47.4% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 5 days** |
| Monetization | — | Free with in-app purchases |
| Size | 71 MB | 107 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Alex Kozachenko](https://appshunter.io/developer/1447875502) | [Sergey Moshkov](https://appshunter.io/developer/1500199012) |

## What reviewers say

### Умный Дизайн

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

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

**In-app purchases:** none


### Lett

[App page](https://appshunter.io/ios/app/lett-instagram-carousel-post/id6752947168)

Create engaging Instagram carousel posts by adding long text directly onto your photos and videos. The app automatically splits your story across slides, ensuring your message is always clear and perfectly aligned.

**Highlights:** Add long text to carousel posts, Place text on photos and videos, Automatic text splitting across slides, Smart backdrop for text readability, Precise text alignment, Fast and seamless creation

**Features:** macOS Compatibility

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lett Premium: Text Carousels | $1.99 | per 7 days |
| Lett Premium: Text Carousels | $2.99 | per 7 days |
| Lett Premium: Text Carousels | $3.99 | per month |
| Lett Premium: Text Carousels | $5.99 | per month |
| Lett Premium: Text Carousels | $17.99 | per 3 months |
| Lett Premium IG Text Carousel | $29.99 | per year |
| Lett Premium: Text Carousels | $49.99 | per year |


## Frequently asked questions

### Is Умный Дизайн free?

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

### Is Lett free?

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

### Do Умный Дизайн or Lett have ads?

Neither Умный Дизайн nor Lett shows ads.

### Which is updated more often, Умный Дизайн or Lett?

Умный Дизайн ships an update fortnightly, and Lett every 5 days. Most recently, Умный Дизайн was updated on October 7, 2026 and Lett on October 25, 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.*