Compare Glasp and Grammarly: Which Extension is the Best?

AI-powered web highlighter for websites, PDFs, and YouTube videos. Build your AI clone from highlights and connect with 1M+ learners worldwide.
Grammarly is a comprehensive writing assistant offering real-time grammar, spelling, punctuation, and style suggestions. With over 44 million users, it’s a trusted tool for enhancing your writing.
Key Features
  • Multi-Platform Highlighting: Highlight text on websites, PDFs, and YouTube videos with multiple color options
  • AI-Powered Summaries: Generate summaries using ChatGPT, Claude, and Gemini models • Social Learning Network: Connect with 1M+ users and discover content from like-minded learners
  • Cross-Platform Sync: Access your highlights across all devices with automatic synchronization
  • Export Integration: Export highlights to Obsidian, Notion, Roam Research, and other note-taking apps
  • Kindle Integration: Import and sync highlights from Kindle ebooks
  • Grammar Checker: Detects and corrects grammatical errors.
  • Spelling Checker: Identifies and fixes spelling mistakes.
  • Punctuation Checker: Ensures proper punctuation usage.
  • Tone Detector: Analyzes the tone of your writing.
  • Auto-Citations: Generates citations for online sources.
  • Generative AI: Produces instant drafts, ideas, and replies.
Our Rating
8.9
8.8
Total users
508,075
55,822,374
Total ratings
887
47,304
Average rating
4.2 ⭐
4.2 ⭐
Entry Level PriceFreeFree
Chrome
Chrome Web Store logo
4.5
3.89
884 ratings
500.0K+Users
Chrome Web Store logo
4.5
3.25
43.0K+ ratings
42.0M+Users
Edge
Microsoft Edge Store logo
4.0
4.25
3 ratings
8.1K+Users
Microsoft Edge Store logo
3.9
4.12
1.1K+ ratings
13.2M+Users
Firefox
-
Mozilla Firefox Add-ons Store logo
4.1
4.01
3.2K+ ratings
655.3K+Users
Safari
-
-
Features
9.5

Highlighting features: In our tests, Glasp's highlighting features worked flawlessly. We were able to highlight text on a variety of websites, in PDF files, and even in YouTube transcripts without any issues. Thanks to the numerous color options and the ability to add notes to each highlight, we were able to easily organize and retrieve our information across different types of content.

AI integration: We tried the AI summary feature with ChatGPT, Claude, and Gemini and found the results really useful for summarizing our highlights and asking questions.

Social learning: We explored the social features by browsing other users' highlights and sharing our own. However, we found it a bit intrusive that this is mandatory in the free version.

Export options: Exporting our highlights to Obsidian and Notion worked smoothly. We tested all available formats (Markdown, HTML, CSV, JSON) and found the flexibility helpful for integrating Glasp into our existing workflows.

9.5

Grammarly goes beyond basic grammar and spelling checks. It offers advanced features like tone detection, vocabulary enhancement, and generative AI capabilities. Compared to competitors, Grammarly provides a more comprehensive set of tools, making it a valuable asset for any writer.

Performance
8.7

In our experience, marking and saving content was quick and almost instantaneous on websites and in PDF files. The extension did not noticeably slow down our browsers.

Most features worked reliably, but we occasionally encountered problems with YouTube transcription and AI summaries, which were also mentioned by users in their reviews.

9.0

Grammarly performs well across different platforms, providing real-time suggestions without significant lag. The tool is reliable and helps improve writing efficiency.

Design
9.3

During our tests, the user interface appeared clear and intuitive. The sidebar did not interfere with reading, but was accessible at all times to view highlights and notes. We liked the color-coded highlights, which made it easier to scan and visually organize information.
The dashboard was well structured and had clearly arranged areas for highlights, notes, and social functions. This made it easy for us to get an overview of all the information we had collected.

8.5

The design is clean and intuitive, making it easy to navigate. The color-coded underlines for suggestions are helpful, and the interface is user-friendly. However, some users might find the pop-ups slightly intrusive.

Value for Money
8.8

We made extensive use of the free plan and found that unlimited tagging and basic organization and access to the social network is more than sufficient for most users.

For heavy users, especially researchers and content creators, the additional AI features and private tags are worth the price of the Pro plan. The price is similar to that of competitors.

Compared to other tools we've tested, Glasp offers a more comprehensive set of features, making the price competitive in the knowledge management space. For those of us who rely on knowledge management in our work, the time savings and improved organization easily justified the Pro subscription.

8.5

While Grammarly offers a free version, the Premium plan is relatively expensive. However, the advanced features and comprehensive feedback justify the cost for those who need a robust writing assistant.

Grammarly is the priciest option for a reason—because, in our view, it's the best writing tool available in its category. If you're looking for the best writing assistant, go for the Premium plan, you won't regret it!

Ease of Use
9.0

Setting up Glasp was quick—we installed the extension, created an account, and were able to start tagging within minutes. The introductory video was clear and helped us get up to speed quickly.
Tagging text and selecting colors was straightforward. We didn't need to consult the help section for basic usage, and the process felt very natural.

When we looked at features such as creating AI clones and advanced export options, it became a little more complex. It took some trial and error to figure out how to best use these tools. Overall, the tool is definitely designed so that anyone can use most of its features.

9.0

Grammarly is straightforward to use, with a minimal learning curve. The browser extension integrates seamlessly with various platforms like Google Docs and Gmail, allowing you to get started right away.

Security & Privacy
8.0

During our review, we found that Glasp collects website content and some personal data to enable its features. By default, some of our highlights were shared publicly. We had to adjust our settings to keep the information private. Therefore, it is important to be aware of this, especially since it is mandatory for free users.

8.0

Grammarly takes privacy seriously, with stringent security measures in place. While an account is required, the company assures users that their data is not sold or made public. However, some users may still have concerns about data processing.

Conclusion

Glasp Web Highlighter has proven in testing that it can help users interact with digital content in a useful way in their everyday lives. It is not just a highlighting tool, but a comprehensive organization system that combines the best aspects of social learning with AI technology.

What we particularly appreciate about Glasp is that it encourages a more intensive engagement with the content. Instead of passively bookmarking pages, users are motivated to highlight specific passages and add notes, which leads to better retention and understanding. It is therefore particularly specialized in learning content.

However, Glasp is not without its challenges. The limitations of the AI features and privacy restrictions in the free version may be problematic for many users. In addition, some users report technical issues with the YouTube transcription features.

For researchers, students, and content creators who are seriously interested in building a kind of second brain, Glasp offers compelling value. The combination of highlighting, AI summarization, and social learning creates a unique ecosystem that is difficult to replicate with other tools. Casual users, however, may find the complexity and pricing structure daunting.

In our eyes, Grammarly is the best choice for anyone who wants to write professional articles or other things in English.

Even though Grammarly has an expensice price tag, you can't get anything better on the market. We have been using Grammarly for a long time now. And even in the world of ChatGPT and other AI tools, Grammarly is just super handy and helpful. For us, the Premium plan is worth every penny.

This only applies as long as you are in the English-speaking world. If you need other languages, we would recommend LanguageTool instead.

Our Recommendation

In our comparison between Glasp and Grammarly, Glasp came out on top, scoring 8.9.

Grammarly is the most widely used, with over 56 million users and 47k+ reviews, but Glasp outperformed it in our review. User reviews reflect our findings.

Notably, Glasp has the highest user rating in the Chrome Web Store at 4.24, which supports its strong performance in our review.

In the end, the differences between these extensions are minimal, so your choice may come down to personal preference or specific features.


  • Can't decide on features? It's a close call: Glasp and Grammarly. In the Features category, Glasp has scored an outstanding 9.5. It offers an exceptional range of features that go above and beyond expectations.
  • Need top performance? Grammarly stands out with a rating of 9. On the other hand, Glasp lags behind in this area with a rating of 8.7.
  • Design lovers, take note: Glasp stands out with a rating of 9.3. On the other hand, Grammarly lags behind in this area with a rating of 8.5.
  • Want to get the most for your money? Glasp stands out with a rating of 8.8. On the other hand, Grammarly lags behind in this area with a rating of 8.5.
  • Ease of use? It's a tie: Glasp and Grammarly. In the Ease of Use category, Glasp has scored a fantastic 9. It is very easy to use, with an intuitive interface that facilitates a smooth user experience.
  • For privacy, it's a tie: Glasp and Grammarly. In the Security & Privacy category, Glasp has scored a solid 8. It offers adequate security and privacy features, though there is room for improvement.

If you want a quick recommendation, Glasp is our top pick. But as always, the best choice depends on what matters most to you.