# ZAstronomy vs Deep Revision

The clearest difference is in-app purchases: ZAstronomy at none against Deep Revision's 1. On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Deep Revision sells 1 one-off in-app purchase. ZAstronomy asks for nothing beyond the download.

## The numbers

| Metric | ZAstronomy | Deep Revision |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | — |
| Size | 71 MB | 44 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Alenti Technologies](https://appshunter.io/developer/1113994945) | [Nowsath Rifaya](https://appshunter.io/developer/6789596498) |

## What reviewers say

### ZAstronomy

[App page](https://appshunter.io/ios/app/zastronomy/id6450145744)

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

**In-app purchases:** none


### Deep Revision

[App page](https://appshunter.io/ios/app/deep-revision-psle-science/id6796186832)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Access Unlock | $6.99 | one-time |


## Frequently asked questions

### Is ZAstronomy free?

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

### Is Deep Revision free?

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

### Do ZAstronomy or Deep Revision have ads?

Neither ZAstronomy nor Deep Revision shows ads.

---

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