Compare Merlin AI and Screencastify: Which Extension is the Best?

Merlin AI is a browser extension and web app that unifies top AI models (ChatGPT, Claude, Gemini, Mistral) for research, summarizing, writing, coding, diagramming, translation, and more—directly in yo
Screencastify is a popular Chrome extension for screen recording. It offers a range of features but has shifted many basic functionalities behind a paywall, affecting its overall value.
Key Features
  • Unified AI Models: Access ChatGPT, Claude, Gemini, Mistral, and more from one account—no need for separate logins.
  • Research & Summarize: Summarize web pages, YouTube videos, PDFs, and documents instantly.
  • Content Creation: Write emails, social media posts, blogs, and outreach messages with AI assistance.
  • Projects: Build custom AI chatbots using your own files, links, or knowledge ba
  • Crafts: Instantly generate code snippets, diagrams, and mindmaps
  • Live Search: Get up-to-date answers by searching the web in real time.
  • Multi-language Support: Translate content into 25+ languages.
  • Keyboard Shortcuts: Quickly summon Merlin with Ctrl/Cmd+M anywhere in your browser.
  • Record Desktop, Browser Tab, and Webcam: Capture any part of your screen.
  • Edit Video: Trim, merge, and add text directly from your browser.
  • Share Easily: Export as MP4, GIF, or MP3, and share via Google Drive or Classroom.
  • Interactive Questions: Add questions to videos to engage viewers.
  • Annotations: Draw on your screen in real-time to highlight key points.
  • Captions: Add captions in multiple languages to make videos accessible.
Our Rating
8.4
7.8
Total users
1,000,000
6,000,000
Total ratings
8,802
11,733
Average rating
4.8 ⭐
4.0 ⭐
Entry Level PriceFreeFree
Chrome
Chrome Web Store logo
4.8
3.24
8.8K+ ratings
1.0M+Users
Chrome Web Store logo
4.0
3.63
11.7K+ ratings
6.0M+Users
Edge
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-
Firefox
-
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Safari
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Features
8.0

Merlin AI offers a variety of features including summarizing, writing, coding, diagramming and more. It supports multiple AI models such as GPT-4, Claude and Gemini and allows users to create custom AI chatbots and knowledge bases. The platform also integrates with the web and files in real time. However, some features, such as PDF summarization, are not as robust as those of specialized tools. It also lacks what we consider to be the important function of direct communication between AI and the current website. In addition, the function of direct communication between AI and the current website, which we consider important, is missing.

Missing Feature
8.8

Screencastify offers a robust set of features, including screen and webcam recording, video editing and interactive questions.

Leaving aside the fact that many features are only available for a fee, it's fair to say that it offers a lot of features.

While recording, you can easily add spotlights and draw on the screen. The drawing tools offer a nice range of options, so you should have everything you need:

Drawing Tools

The subsequent editor also offers many functions where you can cut the video to your needs.

Here is what the basic editor looks like:

Simple editor of Screencastify

It recently also added an AI feature that automatically adds captions, transcripts, titles, and descriptions.

Furthermore, Screencastify offers another video editor when clicking "Edit Video" in the top right corner.

This will open up another editor where you can do some more video editing. Here is how it looks like:

Second editor of Screencastiy

In our opinion, this editor isn’t necessary if you already have your own video editing software, but it could be useful for some people.

We’re not entirely sure if this is just an older version of the original editor. However, we did discover that you can export videos to MP4 for free, thanks to an "Export" button that lets you do so without any limitations.

We’re not certain if this is intentional, but at least it works for us.

Performance
7.5

Merlin is generally fast and responsive, but it can slow down browsers, especially on older hardware. There are occasional bugs and crashes, though the team releases frequent updates and improvements.

7.5

The speed has deteriorated considerably with the latest updates. This is probably because more and more functions, such as the AI function, are being added.

The tool has become slower, and creating links or accessing older videos takes longer than before. Many users have also complained about the performance in the reviews.

Design
9.1

The design has a modern look and feel, with handy keyboard shortcuts and sidebar integration that make navigation easier. That said, the user interface can feel cluttered and overwhelming, especially for new users, and there are inconsistencies between the extension, web, and mobile versions.

Design
9.0

The design is intuitive and user-friendly. We think that navigation is very intuitive despite the many functions.

Value for Money
8.2

The free plan is generous for light users, offering a substantial daily quota and access to a wide range of basic features. The Pro plan is competitively priced, especially when compared to the cost of subscribing to multiple separate AI tools, and unlocks unlimited access to all models and advanced features. However, the absence of a free trial for premium features means users must commit before experiencing the full capabilities of Merlin AI. Additionally, some users report that the query system—where different models and features consume varying amounts of daily queries—can be confusing or feel restrictive, particularly for those trying to understand how far their usage will go on each plan.

5.0

As already mentioned, we are somewhat shocked by the limitations of the free version.

Especially if you have used the app in the past and can export videos for free. In addition, even with the starter package for $7, you are limited to 10 exports.

We find that many other providers offer much more for the money.

Ease of Use
8.5

Getting started with Merlin AI is straightforward—installation is quick, and the onboarding process is simple enough for most users to begin using core features right away. However, the platform’s extensive feature set can be overwhelming at first, leading to a noticeable learning curve as users explore everything it offers. Some users have expressed confusion about how the daily query limits work, how different models are selected or switched, and which features are available on each plan. Occasional bugs and log-in issues can also disrupt the workflow, requiring users to troubleshoot or reach out to support. Overall, while Merlin AI is accessible, mastering its full capabilities may take some time and patience, especially for those new to AI tools.

8.5

Screencastify is easy to use, with a minimal learning curve. Even beginners can quickly get the hang of it. However, we find that recent updates have introduced some complexities that are not absolutely necessary for a screen recorder.

Security & Privacy
9.3

Merlin does not sell user data to third parties and only uses data for core functionality. The privacy policy is transparent, but some users remain concerned about the amount of data collected and the permissions required.

8.0

Unfortunately, an account is required, which in our opinion is not necessary for Screen recorder.

However, Screencastify's privacy policy is very comprehensive and complies with standard data protection practices, including compliance with the GDPR and PCI-DSS certification for payment data. Screencastify takes reasonable security measures but, like all online services, cannot guarantee absolute protection.

Conclusion

Merlin AI is a powerful and versatile tool that can really boost the productivity of a wide range of users. The integration of multiple AI models and functions into a single extension is ideal for this p

However, Merlin is not completely perfect. We encountered occasional bugs, inconsistencies in the user interface and some performance issues. Pricing can also be confusing, and some features are locked behind a paywall..

Overall, Merlin AI is a good choice for anyone looking for an all-in-one AI assistant for the browser - especially if you value having multiple AI models and tools in one place.

Screencastify was a fantastic tool in the past, and we used to use it daily. Unfortunately, recent updates have made it less user-friendly by hiding key features behind a paywall.

For people who need a wide range of features, the tool is still an option. For others who just want to make a recording every now and then to export a video, Screencastify is unfortunately no longer an option.

Our Recommendation

In our comparison between Merlin AI and Screencastify, Merlin AI came out on top, scoring 8.4.

Screencastify is the most widely used, with over 6 million users and 12k+ reviews, but Merlin AI outperformed it in our review. User reviews for Screencastify reflect our findings, while we rate Merlin AI lower than users do.

Notably, Merlin AI has the highest user rating in the Chrome Web Store at 4.80, which is even higher than our rating of 8.4.

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? Screencastify stands out with a rating of 8.8. On the other hand, Merlin AI lags behind in this area with a rating of 8.
  • Performance-wise, both deliver: Merlin AI and Screencastify. In the Performance category, Merlin AI has scored an acceptable 7.5. It performs adequately in most situations, but may struggle under heavier demands.
  • Design lovers, take note: Merlin AI stands out with a rating of 9.1. On the other hand, Screencastify lags behind in this area with a rating of 9.
  • Want to get the most for your money? Merlin AI stands out with a rating of 8.2. On the other hand, Screencastify lags behind in this area with a rating of 5.
  • Ease of use? It's a tie: Merlin AI and Screencastify. In the Ease of Use category, Merlin AI has scored a very good 8.5. It is user-friendly, though there may be a small learning curve for some users.
  • With privacy and security becoming ever more important, Merlin AI stands out with a rating of 9.3. On the other hand, Screencastify lags behind in this area with a rating of 8.

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