# Trinity Theory Practice vs Quick Theory

The clearest difference is iOS requirement: Trinity Theory Practice at 13.0 against Quick Theory's 18.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Trinity Theory Practice sells 6 in-app purchases, starting at $2.99 per month and Quick Theory sells 3 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

Trinity Theory Practice ships an update every 6 weeks, Quick Theory every 3 weeks. The most recent releases landed on October 10, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | Trinity Theory Practice | Quick Theory |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 3 weeks** |
| Size | 100 MB | 87 MB |
| Requires iOS | **13.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [FLY SKY PTY LTD](https://appshunter.io/developer/1838696534) | [HANOCH YOSEF LIB](https://appshunter.io/developer/6788600007) |

## What reviewers say

### Trinity Theory Practice

[App page](https://appshunter.io/ios/app/trinity-theory-practice/id6773275447)

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $2.99 | per month |
| Weekly | $3.99 | per 7 days |
| Monthly | $7.99 | per month |
| Yearly | $12.99 | per year |
| 3 Months | $16.99 | per 3 months |
| Lifetime | $14.99 | one-time |


### Quick Theory

[App page](https://appshunter.io/ios/app/quick-theory/id6790213145)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $4.99 | per month |
| Yearly | $29.99 | per year |
| Lifetime | $59.99 | one-time |


## Frequently asked questions

### Is Trinity Theory Practice free?

Trinity Theory Practice is free to download, with in-app purchases available.

### Is Quick Theory free?

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

### Do Trinity Theory Practice or Quick Theory have ads?

Neither Trinity Theory Practice nor Quick Theory shows ads.

### Which is updated more often, Trinity Theory Practice or Quick Theory?

Trinity Theory Practice ships an update every 6 weeks, and Quick Theory every 3 weeks. Most recently, Trinity Theory Practice was updated on October 10, 2026 and Quick Theory on October 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.*