# APP ISIS vs Grimorio

The clearest difference is in-app purchases: APP ISIS at none against Grimorio's 2. APP ISIS also leads on ads (none vs shown) and iOS requirement (9.0 vs 13.0). Grimorio's advantage is update cadence (every 4 days vs fortnightly). On price and device support there is nothing between them.

Both are free to download. Grimorio sells 2 in-app purchases, starting at $2.99 per month. APP ISIS asks for nothing beyond the download.

APP ISIS ships an update fortnightly, Grimorio every 4 days. The most recent releases landed on October 11, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | APP ISIS | Grimorio |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Fortnightly | **Every 4 days** |
| Size | 72 MB | 173 MB |
| Requires iOS | **9.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [CLEVER SYSTEM SOLUTIONS SPA](https://appshunter.io/developer/1589489268) | [Blank Tech](https://appshunter.io/developer/1889611867) |

## What reviewers say

### APP ISIS

[App page](https://appshunter.io/ios/app/app-isis/id1598219478)

**Features:** macOS Compatibility

**In-app purchases:** none


### Grimorio

[App page](https://appshunter.io/ios/app/grimorio/id6761935740)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Grimorio Pro Monthly | $2.99 | per month |
| Grimorio Pro Annual | $24.99 | per year |


## Frequently asked questions

### Is APP ISIS free?

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

### Is Grimorio free?

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

### Do APP ISIS or Grimorio have ads?

Grimorio shows ads; APP ISIS does not.

### Which is updated more often, APP ISIS or Grimorio?

APP ISIS ships an update fortnightly, and Grimorio every 4 days. Most recently, APP ISIS was updated on October 11, 2026 and Grimorio on October 7, 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.*