# attentio Content Filter vs Liminal

The clearest difference is update cadence: Liminal at every 2 weeks against attentio Content Filter's every 3 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. attentio Content Filter sells 1 in-app purchase, starting at $6.99 per month and Liminal sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

attentio Content Filter ships an update every 3 months, Liminal every 2 weeks. The most recent releases landed on October 15, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | attentio Content Filter | Liminal |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.8 (5 ratings)](https://appshunter.io/ios/app/liminal-learn-philosophy/id6770075835/reviews)** |
| Number of ratings | — | **5** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 weeks** |
| Monetization | — | Free |
| Size | 23 MB | 3 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 9+ |
| Developer | [EasyQuant UG (haftungsbeschrnkt)](https://appshunter.io/developer/1633277242) | [OMAR DANIEL GRAZIANO](https://appshunter.io/developer/1896485759) |

## What reviewers say

### attentio Content Filter

[App page](https://appshunter.io/ios/app/attentio-content-filter/id6673885163)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monk Mode Monthly Subscription | $6.99 | per month |


### Liminal

[App page](https://appshunter.io/ios/app/liminal-learn-philosophy/id6770075835)

Explore Western philosophy with a comprehensive, self-paced curriculum. Access lessons, philosopher profiles, key terms, and quizzes offline. Learn at your own pace with audio narration and interactive features.

**Highlights:** Comprehensive 4-year philosophy curriculum, 104 lessons and 48 philosopher profiles, Searchable glossary of 82 key terms, Interactive quizzes with explanations, Spaced-repetition flashcards, On-device audio narration, Offline access, no network required

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Liminal Full Access | $9.99 | one-time |


## Frequently asked questions

### Is attentio Content Filter free?

attentio Content Filter is free to download, with in-app purchases available.

### Is Liminal free?

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

### Do attentio Content Filter or Liminal have ads?

Neither attentio Content Filter nor Liminal shows ads.

### Which is updated more often, attentio Content Filter or Liminal?

attentio Content Filter ships an update every 3 months, and Liminal every 2 weeks. Most recently, attentio Content Filter was updated on October 15, 2026 and Liminal on October 25, 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.*