# Stages informatiques PRO BTP vs Delta

The clearest difference is in-app purchases: Stages informatiques PRO BTP at none against Delta's 3. Stages informatiques PRO BTP also leads on iOS requirement (10.0 vs 13.0). Delta's advantage is update cadence (monthly vs every 27 months). On price, ads and device support there is nothing between them.

Both are free to download. Delta sells 3 one-off in-app purchases. Stages informatiques PRO BTP asks for nothing beyond the download.

Stages informatiques PRO BTP ships an update every 27 months, Delta monthly. Both last shipped on October 24, 2026.

## The numbers

| Metric | Stages informatiques PRO BTP | Delta |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.1 (7 ratings)](https://appshunter.io/ios/app/delta-algorithms/id1436506800/reviews)** |
| Number of ratings | — | **7** |
| Positive reviews | — | 66.7% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 27 months | **Monthly** |
| Monetization | — | Freemium |
| Size | 17 MB | 5 MB |
| Requires iOS | **10.0** | 13.0 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [PROBTP](https://appshunter.io/developer/542175916) | [Groupe MINASTE](https://appshunter.io/developer/1378426984) |

## What reviewers say

### Stages informatiques PRO BTP

[App page](https://appshunter.io/ios/app/stages-informatiques-pro-btp/id941656120)

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

**In-app purchases:** none


### Delta

[App page](https://appshunter.io/ios/app/delta-algorithms/id1436506800)

This app helps users solve math problems by creating and executing algorithms. It offers tools for homework checking, test preparation, and creating custom quizzes. Users can save, share, and download algorithms via the cloud.

**Highlights:** Create algorithms with natural language, Execute algorithms to solve math problems, Create and download custom quizzes, Save and share algorithms, Cloud synchronization for algorithms

**Features:** Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Donation 1 | $0.99 | one-time |
| Donation 2 | $2.99 | one-time |
| Donation 3 | $4.99 | one-time |


## Frequently asked questions

### Is Stages informatiques PRO BTP free?

Stages informatiques PRO BTP is free to download, with no in-app purchases.

### Is Delta free?

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

### Do Stages informatiques PRO BTP or Delta have ads?

Neither Stages informatiques PRO BTP nor Delta shows ads.

### Which is updated more often, Stages informatiques PRO BTP or Delta?

Stages informatiques PRO BTP ships an update every 27 months, and Delta monthly. Most recently, Stages informatiques PRO BTP was updated on October 24, 2026 and Delta on October 24, 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.*