# Reference Letter AI vs ProyectOS

The clearest difference is update cadence: ProyectOS at every 2 weeks against Reference Letter AI's every 3 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Reference Letter AI sells 4 in-app purchases, starting at $6.99 per 7 days and ProyectOS sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Reference Letter AI ships an update every 3 months, ProyectOS every 2 weeks. The most recent releases landed on November 5, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Reference Letter AI | ProyectOS |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 87.5% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 15 MB | 53 MB |
| Requires iOS | 16.0 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [TINO RALF STRASSER](https://appshunter.io/developer/1799175197) | [Jose Andres Briseno Vidal](https://appshunter.io/developer/1844321438) |

## What reviewers say

### Reference Letter AI

[App page](https://appshunter.io/ios/app/reference-letter-ai-decoder/id6747148720)

Decode the hidden meanings in German employment certificates. This AI-powered tool analyzes your work reference, providing an overall grade, phrase explanations, and identifying subtle criticisms. Get suggestions for improvements and understand your rights.

**Highlights:** AI analysis of work certificates, Overall grade and phrase ratings, Identification of hidden criticism, Improvement suggestions, Legal information and correction letter template, OCR for photos, scans, and PDFs, On-device processing for privacy

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Version | $6.99 | per 7 days |
| 1 Token | $8.99 | one-time |
| 5 Tokens | $34.99 | one-time |
| 10 Tokens | $59.99 | one-time |


### ProyectOS

[App page](https://appshunter.io/ios/app/proyectos/id6753674655)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Desbloquear versión completa | $4.99 | one-time |


## Frequently asked questions

### Is Reference Letter AI free?

Reference Letter AI is free to download, with in-app purchases available.

### Is ProyectOS free?

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

### Do Reference Letter AI or ProyectOS have ads?

Neither Reference Letter AI nor ProyectOS shows ads.

### Which is updated more often, Reference Letter AI or ProyectOS?

Reference Letter AI ships an update every 3 months, and ProyectOS every 2 weeks. Most recently, Reference Letter AI was updated on November 5, 2026 and ProyectOS on October 28, 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.*