Compare LanguageTool and Diigo: Which Extension is the Best?

	LanguageTool	Diigo
	LanguageTool impressed us as a solid grammar-checker alternative to Grammarly. It provides excellent multilingual support, is easy to use, and is more affordable but may struggle with longer texts. Writing Education	Diigo is a handy tool for bookmarking, highlighting, and annotating web pages. It has many features, but its old design and limited highlight colors might make it less appealing. Highlighter Bookmark Manager
Key Features	Style Suggestions: Offers synonym replacements, concise rephrasing, and formal alternatives. Spell Checker: Identifies and corrects spelling errors. Multilingual Support: Supports over 25 languages including English, German, Spanish, and French. Plagiarism Detection: Checks for duplicate content. Personal Dictionary: Allows users to add custom words for future checks. Privacy: GDPR compliant and ensures secure, encrypted connections and no IP address storage.	Highlighting: Works well and highlights are recreated on refresh. Notes: You can add notes to your highlights. Link Creation: Create links to your highlights, although this feature is not very reliable. Sidebar Outliner: Simple design but requires time to understand. Syncing: Highlights are synced across devices.
Our Rating	8.8	7.8
Total users	3,173,195	200,000
Total ratings	16,550	2,319
Average rating	4.8 ⭐	4.6 ⭐
Entry Level Price	Free	Free
Chrome	4.8 11.4K+ ratings 2.0M+Users	4.6 2.3K+ ratings 200.0K+Users
Edge	4.8 567 ratings 801.3K+Users	-
Firefox	4.7 4.6K+ ratings 371.9K+Users	-
Safari	-	-
Features	9.0 LanguageTool offers a comprehensive set of features that go beyond basic grammar and spelling checks. It supports over 20 languages, making it a versatile tool for multilingual users. The advanced grammar checks are particularly impressive, catching complex issues that many other tools miss. Compared to competitors like Grammarly, LanguageTool holds its own with unique features like custom dictionaries and plagiarism detection.	8.5 Diigo offers basic features for a highlighter and bookmarking tool. It works well and we were able to highlight most websites and they were recreated when revisiting them. The highlighter popup makes it easy to highlight text offering 4 colors. It looks like this: We would have wished to have more color options. Also, note-taking and the tagging functionality are working, but its design does not look appealing. The dashboard where your highlights are stored works well and gives you an overview of all your highlights.
Performance	8.0 LanguageTool does a good job of spotting grammar and style issues. However, it can take a while to process longer texts, and sometimes, clicking on suggestions causes the page to jump to the top, which can be a bit frustrating.	8.0 Diigo performs well in terms of highlighting and syncing across devices. The fact that highlights are always synchronized can cause some loading delays. It's not as fast as other highlighters that use an offline-first approach, but it works reasonably well. However, the unreliable link creation feature and the simple sidebar outliner design need improvement.
Design	8.0 The design is clean and intuitive, making it easy for users to navigate and utilize the tool effectively. The browser integration is seamless, and the user interface is straightforward.	7.0 The design fulfills its functionality. The design of Diigo is outdated and could use a modern refresh. The lack of a nice overview of all your highlights on the page itself means you have to open the dashboard on diigo.com instead. The dashboard on diigo.com is okay, but other highlighters like Web Highlights have a much nicer user interface.
Value for Money	9.5 The free version gives you the basics, but the premium version really shines with its advanced features. While Grammarly can be expensive, LanguageTool offers great value at a more affordable price. So, if you’re seeking a budget-friendly alternative to Grammarly, LanguageTool is a solid choice.	8.0 The free version of Diigo offers basic features and is fine for most users. The paid plans are reasonably priced and similar to other highlighters. However, we think other highlighters offer more value for the same price.
Ease of Use	9.0 LanguageTool is very user-friendly, with a minimal learning curve. Most users will find it easy to get started and make the most of its features right out of the box.	7.8 Diigo is fairly easy to use, but the sidebar outliner takes some time to get used to. You can't see all your highlights on the page itself, so you have to go to the dashboard on diigo.com. We wish there was a sidebar to quickly access all our highlighted pages, like in the Web Highlights extension.
Security & Privacy	9.5 LanguageTool takes privacy seriously. No account is required for basic features, and the tool ensures that user data is not sold or made public. This focus on privacy is a significant plus. LanguageTool states that it is GDPR compliant which makes it especially interesting for users in Europe.	7.5 Diigo takes reasonable steps to protect user data. However, since you need an account and your data is stored in their database, absolute protection can't be guaranteed. We think a highlighter should work without needing to sign up, but this feature is missing in Diigo.
Conclusion	LanguageTool is a reliable and efficient writing assistant that supports multiple languages. Its advanced grammar and style checks make it a valuable tool for writers and professionals. While the premium version offers excellent features, the free version is somewhat limited. Overall, LanguageTool is a solid choice for anyone looking to improve their writing. Compared to Grammarly, LanguageTool holds its own, especially if you need to write in multiple languages. When it comes to writing in different languages, LanguageTool is the way to go. But if you’re only writing in English, Grammarly still delivers better results.	Diigo is a handy tool for collecting stuff from the web, like bookmarks, highlights, and notes. It’s a good deal with its premium plans, but the old-fashioned design and limited highlight colors might be a turn-off. If you want something that looks nicer and offers more customization, check out alternatives like Web Highlights.
	Install LanguageTool	Install Diigo
Our Recommendation	In our comparison between LanguageTool and Diigo, LanguageTool came out on top, scoring 8.8. LanguageTool is the most widely used, with over 3 million users and 17k+ reviews—and it also delivered the strongest performance in our tests. User reviews for LanguageTool reflect our findings, while we rate Diigo lower than users do. Notably, LanguageTool has the highest user rating in the Chrome Web Store at 4.76, which supports its strong performance in our review. There are some noticeable differences between these extensions, so it's worth considering your priorities and the details below. Looking for the richest feature set? LanguageTool stands out with a rating of 9. On the other hand, Diigo lags behind in this area with a rating of 8.5. Performance-wise, both deliver: LanguageTool and Diigo. In the Performance category, LanguageTool has scored a good 8. It performs reliably, though it may not excel in all scenarios. Design lovers, take note: LanguageTool stands out with a rating of 8. On the other hand, Diigo lags behind in this area with a rating of 7. Want to get the most for your money? LanguageTool stands out with a rating of 9.5. On the other hand, Diigo lags behind in this area with a rating of 8. If you hate complicated tools, LanguageTool stands out with a rating of 9. On the other hand, Diigo lags behind in this area with a rating of 7.8. With privacy and security becoming ever more important, LanguageTool stands out with a rating of 9.5. On the other hand, Diigo lags behind in this area with a rating of 7.5. If you want a quick recommendation, LanguageTool is our top pick. But as always, the best choice depends on what matters most to you.