Real-time AI answer engine and research workspace combining live web citations with frontier reasoning models.
Real-time AI answer engine and research workspace combining live web citations with frontier reasoning models.
ExplainThis records 1,463 monthly visits with -54% month-over-month growth and Free pricing. MARK•R records 43 monthly visits with -95.1% growth and Freemium pricing.

Highlight any web text and query it with conversational AI, right on the page
| Dimension / Metric | ![]() | |
|---|---|---|
| Official Domain | explainthis.ai | mark-r.com |
| Pricing Model | Free | Freemium |
| Monthly Visits | 1.46K (1,463) | 43 (43) |
| MoM Traffic Delta | -1.72K (-54%) | -825 (-95.1%) |
| Primary Market & Share | 🇺🇸 United States (100%) | 🌐 Global (—) |
| Direct Visits / mo | 428 | 16 |
| User Rating | 3.9 | 4.2 |
| Supported Platforms | Website | Website |
Summarise and explain any page or video as you browse
Turn long articles and pages into a readable summary so you can decide what deserves a full read.
Get the key takeaways from YouTube videos without sitting through the entire runtime.
Primarily a Chrome extension, so it sits alongside whatever you are already browsing rather than forcing a separate app.
Built for startup knowledge workers who need context fast across marketing, sales and product research.

Highlight any web text and query it with conversational AI, right on the page
Selecting any passage on a page activates a dynamic icon and AI prompt field, so a question can be asked at the exact place you are reading rather than in a separate chat window.
Responses draw on the surrounding article or page, not just the highlighted fragment, which supports deeper questions about argument, terminology and implications.
Ask for an executive summary, a white-paper outline, slide talking points, suggested email replies or rewritten copy without leaving the browser.
Explain difficult terms, unpack technical or legal jargon and request simpler phrasing, which helps with dense academic, medical and financial material.
Real-time AI answer engine and research workspace combining live web citations with frontier reasoning models.
Real-time AI answer engine and research workspace combining live web citations with frontier reasoning models.

All-in-one AI assistant across web, browser, desktop and mobile
All-in-one AI assistant across web, browser, desktop and mobile
AI sidebar and browser agent for reading, writing and research
AI sidebar and browser agent for reading, writing and research

One AI assistant that plugs ChatGPT, Claude and Gemini into every tab
One AI assistant that plugs ChatGPT, Claude and Gemini into every tab
One-click AI assistant for browsing, writing and research
One-click AI assistant for browsing, writing and research
Highlight the web, learn in public, and build your AI clone
Highlight the web, learn in public, and build your AI clone
One browser agent that combines every major AI model with web automation

Free / Open-sourceSummarize YouTube, Google, and any page with AI — free in your browser
Free / Open-sourceSummarize YouTube, Google, and any page with AI — free in your browser
Summarize, bookmark and write with AI right in your browser
Summarize, bookmark and write with AI right in your browser

Summarize any YouTube video into key ideas and timestamped notes in seconds.
Summarize any YouTube video into key ideas and timestamped notes in seconds.

Turn long articles, videos and PDFs into structured summaries you can actually search.
Turn long articles, videos and PDFs into structured summaries you can actually search.
Your GPT-powered sidekick for every page, PDF and video
Your GPT-powered sidekick for every page, PDF and video