# DoCube vs KeycoBoard

The clearest difference is rating: DoCube at 4.6 against KeycoBoard's 4.0. DoCube also leads on device support (3 vs 1). On price, review sentiment, ratings volume and update cadence there is nothing between them.

Both are free to download. DoCube sells 1 one-off in-app purchase and KeycoBoard sells 3 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

DoCube holds the better App Store score, 4.6 against 4.0. Both are backed by a comparable volume of ratings — 11 and 4 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

DoCube ships an update every 3 weeks, KeycoBoard fortnightly. The most recent releases landed on September 5, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | DoCube | KeycoBoard |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (11 ratings)](https://appshunter.io/ios/app/docube-pdf-reader-and-notes/id6470183496/reviews)** | [4.0 (4 ratings)](https://appshunter.io/ios/app/keycoboard-ai-rewrite-console/id6748235049/reviews) |
| Number of ratings | **11** | 4 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Fortnightly** |
| Monetization | Free with in-app purchases | Freemium |
| Size | 91 MB | 60 MB |
| Requires iOS | 17.0 | **16.6** |
| Devices | **iPhone, iPad, Mac** | iPhone |
| Age rating | 17+ | 17+ |
| Developer | [巍 赵](https://appshunter.io/developer/1686869575) | [Keyco Tech Ltd.](https://appshunter.io/developer/1807322857) |

## 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 |


### KeycoBoard

[App page](https://appshunter.io/ios/app/keycoboard-ai-rewrite-console/id6748235049)

This AI-powered keyboard extension allows you to instantly rewrite and translate text within any app. Control length, depth, tone, emotion, and emoji density with intuitive sliders. Offers seamless integration and supports multiple languages.

**Highlights:** AI-powered text rewriting, Instant in-app translation, Adjustable length, depth, tone, emotion, and emoji density, Seamless integration with any app, Supports multiple languages, Custom rewrite instructions (Pro)

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| KeycoBoard Pro (Monthly Plan) | $3.99 | per month |
| KeycoBoard Pro (Annual Plan) | $29.99 | per year |
| KeycoBoard Pro LifeTime | $29.99 | one-time |


## Frequently asked questions

### Is DoCube free?

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

### Is KeycoBoard free?

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

### Which has better reviews, DoCube or KeycoBoard?

DoCube is rated higher. DoCube averages 4.6 out of 5 from 11 ratings, while KeycoBoard averages 4.0 from 4 ratings.

### Do DoCube or KeycoBoard have ads?

Neither DoCube nor KeycoBoard shows ads.

### Which is updated more often, DoCube or KeycoBoard?

DoCube ships an update every 3 weeks, and KeycoBoard fortnightly. Most recently, DoCube was updated on September 5, 2026 and KeycoBoard on September 18, 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.*