# Aether vs Folio

The clearest difference is in-app purchases: Aether at none against Folio's 1. Aether also leads on update cadence (weekly vs every 3 weeks) and iOS requirement (15.0 vs 17.0). On price, ads and device support there is nothing between them.

Both are free to download. Folio sells 1 one-off in-app purchase. Aether asks for nothing beyond the download.

Aether ships an update weekly, Folio every 3 weeks. The most recent releases landed on September 18, 2026 and September 11, 2026 respectively.

## The numbers

| Metric | Aether | Folio |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Every 3 weeks |
| Size | 18 MB | 44 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Critical Dynamics OU](https://appshunter.io/developer/330152929) | [Dinh Bao Thang Duong](https://appshunter.io/developer/1529449646) |

## What reviewers say

### Aether

[App page](https://appshunter.io/ios/app/aether-knowledge-engine/id6761418802)

**Features:** macOS Compatibility

**In-app purchases:** none


### Folio

[App page](https://appshunter.io/ios/app/folio-markdown-library/id6765871325)

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Lifetime | $9.99 | one-time |


## Frequently asked questions

### Is Aether free?

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

### Is Folio free?

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

### Do Aether or Folio have ads?

Neither Aether nor Folio shows ads.

### Which is updated more often, Aether or Folio?

Aether ships an update weekly, and Folio every 3 weeks. Most recently, Aether was updated on September 18, 2026 and Folio on September 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.*