Diigo Browser vs QS/1 Message Center
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Diigo Browser
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.
- 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
Read full descriptionHide full description
Diigo Browser allows you to save, annotate and share bookmarks easily! Save and sync You can use Diigo Browser to save web pages to your Diigo account and the bookmarks will sync across your devices so that you can access them anytime, anywhere later. Annotate while reading Diigo Browser allows you to annotate web pages with highlights and sticky notes. The annotate button will pop up in the context menu after you select some text! PDF reading You can read your saved PDF files within the app directly and we will consider supporting PDF annotation in the future! Share easily You can share your bookmarks with annotations to others through email or IM or send it to other apps easily. We will keep working on the improvements of Diigo Browser to make it better and better. Please feel free to contact us at care@diigo.com if you have any questions or suggestions.
QS/1 Message Center
Read full descriptionHide full description
The QS/1 Message Center allows QS/1 product users to receive notifications from QS/1 regarding their products and services.
Screenshots
Verdict
The clearest difference is iOS requirement: QS/1 Message Center at 10.0 against Diigo Browser's 16.0. On price, update cadence, ads and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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, QS/1 Message Center every 3 weeks. The most recent releases landed on October 11, 2026 and September 27, 2026 respectively.
| Parameter | Diigo Browser | QS/1 Message Center |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (561 ratings) — better | — |
| Positive reviews | 58.7% of reviews | — |
| Number of ratings | 561 — better | — |
| Update frequency | Every 2 weeks — better | Every 3 weeks |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 16.0 | 10.0 — better |
| Further details — not scored | ||
| Size | 172 MB | 48 MB |
| Age rating | 17+ | 4+ |
| Developer | Diigo Inc. | RedSail Technologies, LLC |
Bugs and requests
Diigo Browser
Reported bugs
4 issues- Login and sign-up issues
- Sync problems across devices
- Annotation and highlighting bugs
- Crashes and performance issues
Requested features
4 requests- Improved search and filtering
- Offline reading and caching
- Customizable organization and folders
- Better integration with other apps
QS/1 Message Center
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Diigo Browser
No in-app purchases
QS/1 Message Center
No in-app purchases
Questions
Is Diigo Browser free?
Is QS/1 Message Center free?
Do Diigo Browser or QS/1 Message Center have ads?
Which is updated more often, Diigo Browser or QS/1 Message Center?
Other comparisons
