# Alfredo Backer vs Delta

The clearest difference is in-app purchases: Alfredo Backer at none against Delta's 3. Delta's advantage is update cadence (monthly vs every 8 months) and device support (4 vs 2). On price and ads there is nothing between them.

Both are free to download. Delta sells 3 one-off in-app purchases. Alfredo Backer asks for nothing beyond the download.

Alfredo Backer ships an update every 8 months, Delta monthly. The most recent releases landed on September 18, 2026 and August 19, 2026 respectively.

## The numbers

| Metric | Alfredo Backer | 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 8 months | **Monthly** |
| Monetization | — | Freemium |
| Size | 55 MB | 5 MB |
| Requires iOS | 16.0 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Externato Alfredo Backer Ltda](https://appshunter.io/developer/1535072495) | [Groupe MINASTE](https://appshunter.io/developer/1378426984) |

## What reviewers say

### Alfredo Backer

[App page](https://appshunter.io/ios/app/alfredo-backer/id1212354980)

**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 Alfredo Backer free?

Alfredo Backer is free to download, with no in-app purchases.

### Is Delta free?

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

### Do Alfredo Backer or Delta have ads?

Neither Alfredo Backer nor Delta shows ads.

### Which is updated more often, Alfredo Backer or Delta?

Alfredo Backer ships an update every 8 months, and Delta monthly. Most recently, Alfredo Backer was updated on September 18, 2026 and Delta on August 19, 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.*