Hour-long videos.
You don't have time to watch everything— but you still need the takeaways.
Chrome extension · YouTube watch pages · Stop bleeding hours
Summarize. Chat. Study. Five tabs. One click.
You're losing hours on videos you'll never rewatch. SummarizAI plants a panel on every watch page—streaming summaries, timestamped chapters, comment insights, video chat, and study flashcards. Install. Click Summarize. Close the tab with the answer.
Free: 3 summary videos + 3 chat videos per day · Pro removes the cap · youtube.com watch pages
Set CHROME_WEB_STORE_URL in your server env to enable the Chrome Web Store button.
Built for serious YouTube workflows
The problem
Watching shouldn’t feel like homework.
Endless scrubbing.
Finding one quote means dragging the timeline and losing your place.
Comment overload.
The best context is often buried in hundreds of top comments.
SummarizAI turns watch-page data into five tools you can scan, ask, and study—without opening another tab.
The solution
Five tools. One panel. Zero tab chaos.
Stay on the watch page— SummarizAI pulls captions, metadata, and visible comments into one embedded panel beside Share. Summary, Chapters, Comments, Chat, and Study. One click.
Add to Chrome — close the tab faster▶
One panel
Five tabs. One video. Every answer.
This isn't a summary bolted onto YouTube—it's a full workflow panel that ships today.
Skim the whole video in 90 seconds
Streaming AI outline with focus, format, length controls, and 20+ summary languages.
Jump. Don't scrub.
Timestamped chapter summaries with clickable links that seek the player instantly.
Read the room
AI themes from watch-page comments when the thread has the real context.
Ask the video anything
Chat grounded in transcript and summary—no paste, no guesswork, same watch page.
Turn watch time into grades
Flashcards on Free; full quiz and structured study notes on Pro.
Capabilities
Everything that ships today. No vaporware.
Every claim below is live in the extension—built for conversion, not fairy tales.
01
One-click panel on every watch page
Summarize button next to Share. Embedded sidebar or full-height overlay—you pick.
02
Streaming summaries that land fast
Markdown outline streams in real time—Insightful, FAQ, Detailed, emoji, bold highlights, grouped sections.
03
Chapters & jump links
Timestamped sections aligned to caption cues—tap and the player seeks. No scrubbing.
04
Comment insights
AI themes from visible watch-page comments when captions alone won't cut it.
05
Video chat on the same page
Ask questions about the video with transcript-backed context—Free: 3 videos/day, separate from summaries.
06
Study mode: flashcards, quiz, notes
Free: 2 flashcards per generation, 2 advances/day. Pro: full deck, quiz, and structured notes.
07
Fact Check the summary
Claims extracted and verified with search-backed AI. Free: first claim. Pro: every claim.
08
Personas & 20+ languages (Pro personas)
ELI5, Gordon Ramsay, Hacker News, Morgan Freeman, and more—most personas require Pro. Summary language independent of transcript language.
09
No captions? We still show up.
Server transcript fetch plus optional audio ASR fallback when YouTube has nothing—subject to limits and processing time.
Use cases
Built for how you actually use YouTube.
Student
Lectures & tutorials
Extract exam-ready notes, flashcards, and jump to the explanation you need.
Professional
Meetings & talks
Get decisions and quotes fast— skip the replay.
Creator
Research & competitor watch
Scan long videos for hooks, structure, and audience reactions.
Before / after
Less noise. More signal. Close faster.
Watch 45 min or skim randomly
Read a structured summary in ~2 min
Guess where a topic starts
Jump from timestamp to timestamp
Open 10 tabs for context
Five tools. One panel. Zero tab chaos.
Rewatch 40 minutes hunting one quote
Ask Chat—get the answer with context
Copy-paste transcript into another AI tab
Transcript-backed chat on the watch page
How it works
Three steps. Minutes to value. No excuses.
Install
Add SummarizAI from the Chrome Web Store. Takes a minute.
Sign in once
Your account, quotas, and flex settings sync to the panel.
Summarize
Open any video. Tap Summarize. Use all five tabs.
Product demo
Every tab lines up with how YouTube actually works.
Timestamps seek the player
Chapters skim fast
Chat ask the video
Study flashcards & quiz
Fact Check verify claims
20+ languages your summary
Themes dark & light
Compare
Free proves it. Pro removes the cap.
| Free | Pro | |
|---|---|---|
| Summary videos / day | 3 distinct (UTC) | Unlimited |
| Chat videos / day | 3 distinct (UTC) | Unlimited |
| Chapters & timestamps | Yes | Yes |
| Comment insights | Yes | Yes |
| Study flashcards | 2 per generation; 2 advances/day | Scales with video length |
| Quiz & study notes | Preview / upgrade | Full access |
| Fact Check | First claim | All claims |
| Summary personas | Default style | Full library |
| Best for | Prove it on 3 videos today | Daily YouTube power users |
Free quotas reset at midnight UTC. Re-summarizing the same video the same day doesn't burn a slot.
Pricing
Simple pricing. Start free. Upgrade when you're hooked.
Three videos today is enough to prove it. Pro removes every cap—summaries, chat, Study, Fact Check, personas. Prices live from Stripe; cancel anytime.
You've used ? of 3 free summaries today— upgrade and stop counting.
Billing isn't available from this deployment right now.
If you're signing in from the extension, try the upgrade page instead.
Try
Free
$0/mo
- 3 summary + 3 chat videos per UTC day
- Chapters, timestamps, comment insights
- Study: 2 flashcards; Fact Check: first claim
- Enough to prove it—then you decide
Flexible
Pro monthly
—/mo
- Unlimited summaries & chat
- Full Study: quiz, notes, scaled flashcards
- Fact Check every claim; all personas
- Built for daily YouTube power users
Save
Pro annual
—/yr
- Unlimited summaries & chat
- Full Study + Fact Check + personas
- Lowest effective monthly rate
- Same power as monthly—better math
Secure checkout by Stripe
No charge on Free
Upgrade only when you choose
Social proof
People who move fast don't open ten tabs.
“I stopped pausing lectures—summarize, Study flashcards, jump to the proof.”
“Chat answered my question in ten seconds. Timestamps paid for Pro on one all-hands.”
“Five tabs on the watch page. I haven't pasted a transcript into ChatGPT in months.”
Trust
Straight answers— before you buy.
Private by default
Sign-in keeps your account in sync; we don't sell your data.
Cancel anytime
Manage or cancel your subscription in Stripe— no lock-in tricks.
Chat that read the video
Transcript-backed Q&A on the watch page—not a generic chat box guessing from thin air.
Honest free tier
3 summary + 3 chat videos per day on Free—enough to prove it. Upgrade only when you hit the wall.
FAQ
Questions that block upgrades.
Do I need an account?
Free tier requires sign-in so your quota and settings sync across devices.
What counts as one summary?
One distinct YouTube video per UTC day on Free; re-summarizing the same video the same day doesn't use another slot.
When does my free quota reset?
Midnight UTC.
Do I need the extension?
Yes— summaries run in the panel embedded on YouTube.
Can I upgrade from this page?
Yes— choose a plan and you'll sign in if needed, then checkout on Stripe.
Is payment secure?
Checkout is hosted by Stripe; we never see your card number.
Can I cancel Pro?
Yes— cancel anytime; you keep Pro until the period ends.
What if a video has no captions?
We try captions first; when unavailable, audio transcription may be used (subject to limits and processing time).
What is the best way to summarize long YouTube videos?
Read a structured summary with chapters and timestamps first, then click timestamps to hear only the sections you need—SummarizAI does this on the watch page via the Summarize button.
Does SummarizAI work on lecture and podcast uploads?
Yes when captions or usable audio exist—hour-long episodes work best with caption-backed summaries and timestamp seeking.
Can I summarize YouTube without leaving the watch page?
Yes—the Chrome extension embeds summaries beside Share on youtube.com/watch so you do not paste URLs into another tab.
Is chat included on Free?
Yes—Free includes 3 distinct chat videos per UTC day, separate from your 3 summary videos. Same video again the same day doesn't burn another slot. Pro removes both caps.
What is Study mode?
Study generates flashcards from the transcript. Free: 2 flashcards per generation and 2 card advances per day. Quiz and structured study notes are Pro—upgrade when you're serious.
What is Fact Check?
Fact Check pulls claims from your summary and verifies them with search-backed AI. Free checks the first claim. Pro checks every claim. Not legal advice—use your judgment.
Can I change summary style and personas?
Yes—pick focus (Insightful, Actionable, Funny…), format (List or FAQ), length, emoji, and bold highlights. Most personas (ELI5, Gordon Ramsay, Hacker News, and more) require Pro.
Need the Chrome listing? See Install guide or Install help.
Install SummarizAI
When your Chrome Web Store URL is configured on the server, every “Add to Chrome” button links there automatically.
Developers can load an unpacked build from ce/dist/ while iterating— see the repo README.
Stop donating hours to YouTube.
Install free. Summarize three videos today. Upgrade when the cap becomes the problem—not before.