# Grimorio vs Principles Personal Discovery

The clearest difference is ads: Principles Personal Discovery at none against Grimorio's shown. Grimorio's advantage is update cadence (every 4 days vs every 3 weeks) and iOS requirement (13.0 vs 15.1). On price, in-app purchases 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 and Principles Personal Discovery sells 10 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Grimorio ships an update every 4 days, Principles Personal Discovery every 3 weeks. The most recent releases landed on October 7, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | Grimorio | Principles Personal Discovery |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 4 days** | Every 3 weeks |
| Size | 173 MB | 57 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Blank Tech](https://appshunter.io/developer/1889611867) | [TAN HAI LONG PHUNG](https://appshunter.io/developer/6777108773) |

## What reviewers say

### 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 |


### Principles Personal Discovery

[App page](https://appshunter.io/ios/app/principles-personal-discovery/id6789200479)

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Palace Report - Friends | $0.99 | one-time |
| Palace Report - Parents | $0.99 | one-time |
| Palace Report - Spouse | $0.99 | one-time |
| Palace Report - Siblings | $0.99 | one-time |
| Palace Report - Health | $0.99 | one-time |
| Palace Report - Children | $0.99 | one-time |
| Palace Report - Travel | $0.99 | one-time |
| Palace Report - Blessing | $0.99 | one-time |
| Annual Reading | $0.99 | one-time |
| Connection Report | $0.99 | one-time |


## Frequently asked questions

### Is Grimorio free?

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

### Is Principles Personal Discovery free?

Principles Personal Discovery is free to download, with in-app purchases available.

### Do Grimorio or Principles Personal Discovery have ads?

Grimorio shows ads; Principles Personal Discovery does not.

### Which is updated more often, Grimorio or Principles Personal Discovery?

Grimorio ships an update every 4 days, and Principles Personal Discovery every 3 weeks. Most recently, Grimorio was updated on October 7, 2026 and Principles Personal Discovery on October 11, 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.*