# Alien Planets vs KnowScroll

The clearest difference is price: KnowScroll at Free against Alien Planets's $9.99. KnowScroll also leads on update cadence (every 8 days vs every 24 months) and iOS requirement (16.4 vs 27.0). Alien Planets's advantage is in-app purchases (none vs 1) and ads (none vs shown). On device support there is nothing between them.

KnowScroll is free to download; Alien Planets costs $9.99 up front. KnowScroll sells 1 one-off in-app purchase. Alien Planets asks for nothing beyond the download.

Alien Planets ships an update every 24 months, KnowScroll every 8 days. The most recent releases landed on November 11, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Alien Planets | KnowScroll |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 24 months | **Every 8 days** |
| Size | 51 MB | 74 MB |
| Requires iOS | 27.0 | **16.4** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Jose Leal](https://appshunter.io/developer/1441468562) | [Vu Viet Duc](https://appshunter.io/developer/1888927607) |

## What reviewers say

### Alien Planets

[App page](https://appshunter.io/ios/app/alien-planets/id1478121868)

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

**In-app purchases:** none


### KnowScroll

[App page](https://appshunter.io/ios/app/knowscroll-knowledge-feed/id6780197640)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime Premium | $49.99 | one-time |


## Frequently asked questions

### Is Alien Planets free?

Alien Planets costs $9.99, with no in-app purchases.

### Is KnowScroll free?

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

### Do Alien Planets or KnowScroll have ads?

KnowScroll shows ads; Alien Planets does not.

### Which is updated more often, Alien Planets or KnowScroll?

Alien Planets ships an update every 24 months, and KnowScroll every 8 days. Most recently, Alien Planets was updated on November 11, 2026 and KnowScroll on October 31, 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.*