# Diigo Browser vs CalypsoSpray

The clearest difference is update cadence: Diigo Browser at every 2 weeks against CalypsoSpray's every 6 weeks. CalypsoSpray's advantage is iOS requirement (14.0 vs 16.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Diigo Browser ships an update every 2 weeks, CalypsoSpray every 6 weeks. The most recent releases landed on October 26, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Diigo Browser | CalypsoSpray |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (563 ratings)](https://appshunter.io/ios/app/diigo-browser/id933773981/reviews)** | — |
| Number of ratings | **563** | — |
| Positive reviews | 58.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 6 weeks |
| Monetization | Free | — |
| Size | 172 MB | 18 MB |
| Requires iOS | 16.0 | **14.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [Diigo Inc.](https://appshunter.io/developer/335006603) | [Calypso Instruments](https://appshunter.io/developer/928168289) |

## 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


### CalypsoSpray

[App page](https://appshunter.io/ios/app/calypsospray/id6769805534)

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

**In-app purchases:** none


## Frequently asked questions

### Is Diigo Browser free?

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

### Is CalypsoSpray free?

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

### Do Diigo Browser or CalypsoSpray have ads?

Neither Diigo Browser nor CalypsoSpray shows ads.

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

Diigo Browser ships an update every 2 weeks, and CalypsoSpray every 6 weeks. Most recently, Diigo Browser was updated on October 26, 2026 and CalypsoSpray on October 6, 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.*