# KnowScroll vs Curium

The clearest difference is update cadence: Curium at every 3 days against KnowScroll's every 8 days. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. KnowScroll sells 1 one-off in-app purchase and Curium sells 2 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

KnowScroll ships an update every 8 days, Curium every 3 days. The most recent releases landed on October 28, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | KnowScroll | Curium |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 8 days | **Every 3 days** |
| Size | 74 MB | 46 MB |
| Requires iOS | 16.4 | 16.4 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 12+ |
| Developer | [Vu Viet Duc](https://appshunter.io/developer/1888927607) | [Quentin Drumez](https://appshunter.io/developer/1838659514) |

## What reviewers say

### 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 |


### Curium

[App page](https://appshunter.io/ios/app/curium-learn-facts-and-trivia/id6793886587)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Curium+ Monthly | $1.99 | per month |
| Curium+ Annual | $17.99 | per year |


## Frequently asked questions

### Is KnowScroll free?

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

### Is Curium free?

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

### Do KnowScroll or Curium have ads?

Both KnowScroll and Curium show ads.

### Which is updated more often, KnowScroll or Curium?

KnowScroll ships an update every 8 days, and Curium every 3 days. Most recently, KnowScroll was updated on October 28, 2026 and Curium 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.*