# Prompt Engineering Learn AI vs Delta

The clearest difference is in-app purchases: Prompt Engineering Learn AI at none against Delta's 2. Prompt Engineering Learn AI also leads on device support (3 vs 1) and iOS requirement (13.0 vs 18.0). On price and ads there is nothing between them.

Both are free to download. Delta sells 2 in-app purchases, starting at $4.99 per month. Prompt Engineering Learn AI asks for nothing beyond the download.

## The numbers

| Metric | Prompt Engineering Learn AI | Delta |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Every 2 weeks |
| Size | 51 MB | 9 MB |
| Requires iOS | **13.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Disha Thummar](https://appshunter.io/developer/1874186683) | [Vishnuteja Nanduri](https://appshunter.io/developer/6811360443) |

## What reviewers say

### Prompt Engineering Learn AI

[App page](https://appshunter.io/ios/app/prompt-engineering-learn-ai/id6786631909)

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

**In-app purchases:** none


### Delta

[App page](https://appshunter.io/ios/app/delta-ai-engineering/id6811360441)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Delta Pro | $4.99 | per month |
| Delta Pro | $49.99 | per year |


## Frequently asked questions

### Is Prompt Engineering Learn AI free?

Prompt Engineering Learn AI is free to download, with no in-app purchases.

### Is Delta free?

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

### Do Prompt Engineering Learn AI or Delta have ads?

Neither Prompt Engineering Learn AI nor Delta shows ads.

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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.*