# Diigo Browser vs Cydog Browser

The clearest difference is rating: Diigo Browser at 4.5 against Cydog Browser's 3.3. Diigo Browser also leads on in-app purchases (none vs 4) and ratings volume (563 vs 10). Cydog Browser's advantage is device support (4 vs 2). On price, update cadence, ads and iOS requirement there is nothing between them.

Both are free to download. Cydog Browser sells 4 one-off in-app purchases. Diigo Browser asks for nothing beyond the download.

Diigo Browser holds the better App Store score, 4.5 against 3.3. That said, the two scores are not equally well evidenced: Diigo Browser has 563 ratings behind it against 10, so its average is the more settled of the two. Written reviews point the same way: 59% of Diigo Browser's written reviews are positive against 44% of Cydog Browser's.

Diigo Browser ships an update every 2 weeks, Cydog Browser every 10 days. The most recent releases landed on October 26, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Diigo Browser | Cydog Browser |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (563 ratings)](https://appshunter.io/ios/app/diigo-browser/id933773981/reviews)** | [3.3 (10 ratings)](https://appshunter.io/ios/app/cydog-browser/id1563014942/reviews) |
| Number of ratings | **563** | 10 |
| Positive reviews | **58.7% of reviews** | 44.4% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 10 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 172 MB | 80 MB |
| Requires iOS | 16.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod, Mac** |
| Age rating | 17+ | 17+ |
| Developer | [Diigo Inc.](https://appshunter.io/developer/335006603) | [Matthew Benchimol](https://appshunter.io/developer/1543638141) |

## What reviewers say

### Diigo Browser

[App page](https://appshunter.io/ios/app/diigo-browser/id933773981)

Save, sync, and annotate web pages and PDFs across devices. Easily share your saved content with highlights and sticky notes. Access your bookmarks anytime, anywhere.

**Highlights:** Save and sync bookmarks, Annotate web pages with highlights, Add sticky notes to web pages, Read saved PDF files, Share bookmarks with annotations, Cross-device access

**Features:** Apple Wallet, Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 💡 Useful for research and organization
- 👍 Syncs across devices
- 🚀 Efficient for bookmarking and annotating

**What reviewers complain about**

- 🐛 Buggy and crashes frequently
- 🔨 Lacking in features and functionality
- 🔍 Search and discovery issues
- 🔒 Login and sync problems

**Reported bugs**

- Login and sign-up issues
- Sync problems across devices
- Annotation and highlighting bugs
- Crashes and performance issues

**Requested features**

- Improved search and filtering
- Offline reading and caching
- Customizable organization and folders
- Better integration with other apps


### Cydog Browser

[App page](https://appshunter.io/ios/app/cydog-browser/id1563014942)

This mobile browser enhances security with customizable features and an offline database for storing internet content. It offers a dedicated search with numerous engines and advanced encryption technologies to protect against cyber threats. An iMessage extension allows for secure, encrypted messaging.

**Highlights:** Enhanced mobile browser security, Offline database for internet content, Encrypted bookmarks and pictomarks, 40+ search engine integration, Proprietary anti-cookie and firewall tech, Deterrence decryption feature, Secure iMessage extension

**Features:** Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Cydog Walled Garden | $0.99 | one-time |
| Cydog Wall Watcher | $0.99 | one-time |
| Cydog Injector | $0.99 | one-time |
| Cydog Iconography | $0.99 | one-time |


## Frequently asked questions

### Is Diigo Browser free?

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

### Is Cydog Browser free?

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

### Which has better reviews, Diigo Browser or Cydog Browser?

Diigo Browser is rated higher. Diigo Browser averages 4.5 out of 5 from 563 ratings, while Cydog Browser averages 3.3 from 10 ratings.

### Do Diigo Browser or Cydog Browser have ads?

Neither Diigo Browser nor Cydog Browser shows ads.

### Which is updated more often, Diigo Browser or Cydog Browser?

Diigo Browser ships an update every 2 weeks, and Cydog Browser every 10 days. Most recently, Diigo Browser was updated on October 26, 2026 and Cydog Browser on October 24, 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.*