# dob pro vs La lettre mystère

The clearest difference is price: La lettre mystère at $2.99 against dob pro's $49.99. La lettre mystère also leads on device support (3 vs 1). dob pro's advantage is update cadence (every 3 months vs every 11 months). On ads, in-app purchases and iOS requirement there is nothing between them.

dob pro costs $49.99 and La lettre mystère $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

dob pro ships an update every 3 months, La lettre mystère every 11 months. Both last shipped on October 29, 2026.

## The numbers

| Metric | dob pro | La lettre mystère |
| --- | --- | --- |
| Price | $49.99 | **$2.99** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 11 months |
| Size | 78 MB | 138 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Rene Fehr-Biscioni](https://appshunter.io/developer/969998405) | [CROMBEZ Emmanuel](https://appshunter.io/developer/375656695) |

## What reviewers say

### dob pro

[App page](https://appshunter.io/ios/app/dob-pro-visual-perception/id969998406)

**In-app purchases:** none


### La lettre mystère

[App page](https://appshunter.io/ios/app/la-lettre-mystere/id1044093075)

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

**In-app purchases:** none


## Frequently asked questions

### Is dob pro free?

dob pro costs $49.99, with no in-app purchases.

### Is La lettre mystère free?

La lettre mystère costs $2.99, with no in-app purchases.

### Do dob pro or La lettre mystère have ads?

Neither dob pro nor La lettre mystère shows ads.

### Which is updated more often, dob pro or La lettre mystère?

dob pro ships an update every 3 months, and La lettre mystère every 11 months. Most recently, dob pro was updated on October 29, 2026 and La lettre mystère on October 29, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*