The video keeps moving. So do you.

Nimdea notices the rare term that could derail the whole lesson, pauses at the right moment, and explains it in plain language — before confusion becomes another open tab.

  • Free forever — 15 AI actions a day
  • No account required
  • Chrome · Brave · Edge

4.2s

from term to clarity

90%+

confidence to interrupt

Learns

what you already know

Interruption budget

Strict mode · only high-impact concepts

1 this lesson
youtube.com/watch · Black Holes Explained — From Birth to Death

Once matter crosses the , every possible path points deeper into the black hole.

2:18
Rare + important concepts onlyCalibrated to your levelPauses, never talks over the video

Works where you watch, read & write

YouTubeNetflixHBO MaxCourseraUdemyVimeoApple TVGmailXYouTubeNetflixHBO MaxCourseraUdemyVimeoApple TVGmailX

Most people don't pause a video to look things up.

They just quietly stop understanding.

Nimdea exists so you never have to.

What Nimdea does

One extension for every “wait, what?”

Seven tools that live quietly inside the pages you already use — ready automatically, with a shortcut, or from a highlight.

01

Automatic explanations while you watch

Nimdea watches for the rare concept that the rest of the lesson depends on. When its confidence is high enough, it pauses once, explains the idea, and lets you continue in chat.

  • Interrupts only when unfamiliarity and importance both clear a strict threshold
  • Learns the terms you know and never repeats them
  • Alt+C remains available whenever you want to ask manually
7:48 / 12:20

…the market is basically betting on a soft landing at this point.

Soft landing

1.1s

When a central bank slows the economy just enough to cool inflation — without tipping it into a recession.

TranslateAsk more

No subtitles on the video? Nimdea transcribes the audio and keeps up anyway.

02
AltS

The TL;DR for anything you read

Long articles, dense documentation, endless threads — get the gist and the key points in seconds, then decide if it's worth your time.

  • One-sentence summary plus the points that matter
  • Strips the fluff, keeps the substance
  • Works on any webpage, instantly

TL;DR

The 4,000-word report in one sentence: remote work didn't hurt productivity — it moved it.

Output rose 6% for hybrid teams

Senior engineers gained the most focus time

Meetings dropped, async docs replaced them

03
AltL

Read any page in two languages at once

Bilingual inline translation keeps the original text and slides the translation in beneath it — the fastest way to read foreign-language content and actually learn from it.

  • 18 languages, one shortcut to toggle
  • Original text stays put — you never lose your place
  • Built for language learners and researchers

この論文では、新しい治療法の結果を報告する。

This paper reports the results of a new treatment.

対象群は、十二週間にわたって追跡された。

The treatment group was followed for twelve weeks.

18 languages · the original stays, the translation slides in beneath it

Highlight anything, understand it

Select a word, a sentence, a formula — a small toolbar appears with an instant explanation or translation.

The treaty established a demilitarized zone along the border…

ExplainTranslate

Rewrite what you're typing

Fix grammar, shorten, formalize — right inside the text box you're already writing in.

hey, just checking if u got my last message about the deadline…

ImproveShorterFormalGrammar

Email replies in two seconds

On Gmail, Nimdea reads the thread and drafts a reply that matches its tone.

Draft reply with Nimdea

Matches the thread's tone · insert or copy

A chat that knows the page

Open the sidebar with Alt+M and ask follow-ups about what you're watching or reading.

What did he mean by “event horizon”?
In this video, it's the boundary around the black hole he mentioned at 3:40…
How it works

Up and running in thirty seconds

No dashboards to configure, nothing to learn. If you can press two keys, you can use Nimdea.

1

Add Nimdea to Chrome

One click from the Chrome Web Store. No account, no setup — it works on every site the moment it's installed.

2

Watch and read like you always do

Nimdea sits quietly inside the page — following video captions, ready on any article, doc, or email thread.

3

Get help before you're lost

Nimdea pauses only for a rare, important concept. Dismiss it, mark it as known, or continue the explanation in chat.

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Alt
Alt
Alt+CExplain what was just said
Alt+TTranslate the captions
Alt+SSummarize this page
Alt+LRead page bilingually
Alt+MOpen the chat sidebar
Platforms

Wherever you watch, Nimdea works

Deep integrations with the biggest video platforms — and because Nimdea can transcribe a tab's audio, it works even where subtitles don't exist.

YouTubeNetflixHBO MaxCourseraUdemyVimeoApple TV+ any website
Pricing

Simple, honest pricing

Start free — no credit card, no account. Upgrade only when you hit the limits, which most people never do.

Free

$0forever

Everything you need to start understanding more.

  • 15 AI actions per day
  • 10 transcription minutes per month
  • Video caption explain & translate
  • Text selection tools
  • Page summaries
  • Works on all video platforms
Add to Chrome
Best value

Pro Yearly

$72/year

$6/mo billed yearly — save 25%

Generous personal use, at the best price.

  • Unlimited AI actions for normal personal use
  • 120 transcription minutes per month
  • Higher automatic-help allowance
  • Shared access across the dashboard and extension
  • Cancel any time in the customer portal

Pro Monthly

$8/month

Generous personal use, with total flexibility.

  • Unlimited AI actions for normal personal use
  • 120 transcription minutes per month
  • Higher automatic-help allowance
  • Shared access across the dashboard and extension
  • Cancel any time in the customer portal
FAQ

Questions, answered

Yes. The free plan includes 15 AI actions per day, video caption explain and translate, text selection tools, page summaries, and 10 transcription minutes each month — forever, with no credit card. Pro ($8/mo or $72/yr) removes the standard AI-action limit and includes 120 transcription minutes.

Start understanding more, today.

The next video that loses you is coming. Be ready for it.

Free forever · No credit card · No account required