AI-powered web highlighter for websites, PDFs, and YouTube videos. Build your AI clone from highlights and connect with 1M+ learners worldwide. | ||
Key Features A summary of the most important features offered by each extension. |
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Our Rating Tooltivity's expert review score for each extension, based on hands-on testing and research. | 8.9 Winner in this category | 8.7 |
Total users Total active users across all major browsers: Chrome, Edge, Firefox, and Safari. | 506,682 | 8,035,097 Winner in this category |
Total ratings Total number of user ratings received across all supported browsers. | 840 | 112,430 Winner in this category |
Average rating Average user rating across all browsers, calculated from available store ratings. | 4.2 ⭐ | 4.9 ⭐ Winner in this category |
Entry Level Price The minimum price required to start using the extension. "Free" means a free tier is available. | Free | Free |
Chrome User rating and stats for the extension on Chrome browser. | ![]() 4.5 3.78 Average Chrome Web Store rating from the last 100 reviews 500.0K+Users | ![]() 4.9 4.92 Average Chrome Web Store rating from the last 100 reviews 5.0M+Users Winner in this category |
Edge User rating and stats for the extension on Edge browser. | ![]() 4.0 4.25 Average Microsoft Edge Store rating from the last 100 reviews 6.7K+Users | ![]() 4.8 4.32 Average Microsoft Edge Store rating from the last 100 reviews 3.0M+Users Winner in this category |
Firefox User rating and stats for the extension on Firefox browser. | - | - |
Safari User rating and stats for the extension on Safari browser. | - | - |
Features Tooltivity's expert score for the 'Features' aspect of each extension. | 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. Winner in this category | 9.5 Sider offers a comprehensive range of functions and is designed to provide a solution for every possible use of AI. From AI writing assistance to PDF analysis, for example, it covers all areas for every blogger. Creatives also get their money's worth here, whether creating images from text or editing photos, Sider offers these functions in just one tool and integrates the functions of other providers into your one tool. ![]() The number of integrated AI models, such as GPT-4o, Claude, or Gemini, also stands out. This ensures that users have access to the latest technology. ![]() In summary, Sider offers almost all of the current possibilities of AI in one tool. Winner in this category |
Performance Tooltivity's expert score for the 'Performance' aspect of each extension. | 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. | 9.2 Sider generally performs well in the test with fast response times and reliable functions. The integration of multiple AI models ensures that users receive accurate and relevant information. However, there can be occasional delays, especially when using advanced features or at peak times. Continuous updates and optimizations could further improve performance. Winner in this category |
Design Tooltivity's expert score for the 'Design' aspect of each extension. | 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. Winner in this category | 8.5 The design of Sider is very user-friendly, and the interface is quite clear, so it's easy to find anything. The sidebar is great because you can access features without leaving the page. However, it might feel cluttered for some people as there are so many options. A sleeker design could improve the user experience. |
Value for Money Tooltivity's expert score for the 'Value for Money' aspect of each extension. | 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. Winner in this category | 7.8 While Sider offers a free version with limited requirements, the premium plans can be expensive for casual users. While the feature set justifies the cost for power users, those who only need basic features may find it expensive. The availability of different pricing tiers offers flexibility, but an intermediate solution with a cheaper option could appeal to a wider audience. |
Ease of Use Tooltivity's expert score for the 'Ease of Use' aspect of each extension. | 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. 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. Winner in this category | 9.0 In our tests, Sider was easy to use without having to learn how to use it. The tooltips and instructions help you get started right away. It works well in our tests with popular browsers such as Chrome and Edge, which are quick to install and use. However, if you want to delve into the advanced functions, it can take a while to get to grips with everything. Basic users might be a little overwhelmed here. Winner in this category |
Security & Privacy Tooltivity's expert score for the 'Security & Privacy' aspect of each extension. | 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. Winner in this category | 8.0 Sider stores the data on Amazon's US servers. The data protection guidelines are transparent and users have control over their data. However, usage data is collected for analysis purposes, which not every user will find acceptable. The assurance that data is never passed on and no spam messages are sent is a positive aspect. Winner in this category |
Conclusion A summary of our findings and final thoughts for each extension. | 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. | Sider is an AI tool that can significantly increase user productivity across multiple platforms. The high number of features, from writing assistance to image editing, makes it a versatile choice for truly anyone. Although it excels in many areas, there is still room for improvement. In particular, the sometimes high prices will put normal users off. Overall, Sider is a valuable tool for anyone who wants to combine almost all the possibilities of AI in one tool and is willing to pay for it. |
Our Recommendation | In our comparison between Glasp and Sider, Glasp came out on top, scoring 8.9. Sider is the most widely used, with over 8 million users and 112k+ reviews, but Glasp outperformed it in our review. User reviews for Glasp reflect our findings, while we rate Sider lower than users do. Notably, Sider has the highest user rating in the Chrome Web Store at 4.86, which is even higher than our rating of 8.7. In the end, the differences between these extensions are minimal, so your choice may come down to personal preference or specific features.
If you want a quick recommendation, Glasp is our top pick. But as always, the best choice depends on what matters most to you. |