# DoCube vs Cargo 66

The clearest difference is in-app purchases: Cargo 66 at none against DoCube's 1. Cargo 66 also leads on iOS requirement (13.0 vs 17.0). DoCube's advantage is update cadence (every 3 weeks vs every 6 months). On price, ads and device support there is nothing between them.

Both are free to download. DoCube sells 1 one-off in-app purchase. Cargo 66 asks for nothing beyond the download.

DoCube ships an update every 3 weeks, Cargo 66 every 6 months. The most recent releases landed on September 5, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | DoCube | Cargo 66 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (11 ratings)](https://appshunter.io/ios/app/docube-pdf-reader-and-notes/id6470183496/reviews)** | — |
| Number of ratings | **11** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 6 months |
| Monetization | Free with in-app purchases | — |
| Size | 91 MB | 28 MB |
| Requires iOS | 17.0 | **13.0** |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [巍 赵](https://appshunter.io/developer/1686869575) | [Tps Advertising](https://appshunter.io/developer/1461757244) |

## What reviewers say

### DoCube

[App page](https://appshunter.io/ios/app/docube-pdf-reader-and-notes/id6470183496)

This app transforms reading into knowledge retention with features like multi-tab browsing, precise document navigation, and versatile annotation tools. It supports various formats and converts highlights into flashcards for effective memorization and review.

**Highlights:** Multi-tab reading for multiple documents, Precise document positioning and history navigation, Support for PDF, EPUB, Markdown, and web pages, Six annotation tools including highlights and notes, Cross-document linking for knowledge networks, Automatic flashcard creation from highlights, AI-enhanced card generation

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full-platform Professional Edition | $34.99 | one-time |


### Cargo 66

[App page](https://appshunter.io/ios/app/cargo-66/id6670597485)

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

**In-app purchases:** none


## Frequently asked questions

### Is DoCube free?

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

### Is Cargo 66 free?

Cargo 66 is free to download, with no in-app purchases.

### Do DoCube or Cargo 66 have ads?

Neither DoCube nor Cargo 66 shows ads.

### Which is updated more often, DoCube or Cargo 66?

DoCube ships an update every 3 weeks, and Cargo 66 every 6 months. Most recently, DoCube was updated on September 5, 2026 and Cargo 66 on September 22, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*