# Cubic vs Knowzi

The clearest difference is in-app purchases: Knowzi at none against Cubic's 2. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Cubic sells 2 in-app purchases, starting at $3.99 per month. Knowzi asks for nothing beyond the download.

Cubic ships an update every 6 days, Knowzi every 4 days. The most recent releases landed on October 14, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Cubic | Knowzi |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/cubic-second-brain-and-reader/id6758525542/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 6 days | **Every 4 days** |
| Monetization | Freemium | — |
| Size | 63 MB | 26 MB |
| Requires iOS | 18.5 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 17+ | 17+ |
| Developer | [ARPIT MATHUR](https://appshunter.io/developer/1873364032) | [Karen-Happuch Henneh](https://appshunter.io/developer/1875186279) |

## What reviewers say

### Cubic

[App page](https://appshunter.io/ios/app/cubic-second-brain-and-reader/id6758525542)

Transform passive reading into active learning by saving articles, organizing content, and creating reviewable flashcards from your highlights. Discover new material through RSS feeds or curated collections and track your learning progress over time.

**Highlights:** Discover content via RSS feeds and curated collections, Save articles and organize into a personal library, Add notes and highlights to saved content, Convert highlights into reviewable flashcards, Track reading habits and learning trends, Organize content for recall

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Cubic Pro Monthly | $3.99 | per month |
| Cubic Pro Yearly | $14.99 | per year |


### Knowzi

[App page](https://appshunter.io/ios/app/knowzi/id6758828561)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Cubic free?

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

### Is Knowzi free?

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

### Do Cubic or Knowzi have ads?

Neither Cubic nor Knowzi shows ads.

### Which is updated more often, Cubic or Knowzi?

Cubic ships an update every 6 days, and Knowzi every 4 days. Most recently, Cubic was updated on October 14, 2026 and Knowzi on October 8, 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.*