TubeSum

Chrome extension that turns long YouTube videos into AI-generated summaries with clickable timestamps.

Freemium· Free tier; Pro $7/mo; Premium $20/moAgents

Best for

Pick TubeSum if you watch a lot of long YouTube content and want a cheap, timestamp-aware summarizer that lives inside the YouTube tab.

Skip if

Skip it if you need an audited model, an API, or summaries of videos that lack captions or live outside YouTube.

TubeSum is a browser extension that injects an AI summarization panel into YouTube, pulling transcripts and condensing them into bullet-style overviews, keyword highlights, and timestamped outlines you can click to jump to the relevant moment in the video. It's aimed at people who skim long-form content - lectures, podcasts, conference talks, tutorials - and want the gist without scrubbing through an hour of footage.

What differentiates TubeSum from the dozens of other YouTube summarizer extensions is the timestamp navigation and multi-language support baked into the paid tiers, plus a meaningfully usable free plan for short videos. Pricing is cheap by the standards of this category: free for basics, around $7/mo for Pro (up to ~2 hour videos, keyword extraction, saved summaries), and a $20/mo Premium tier with unlimited length and batch processing. There is no public claim about which underlying LLM powers the summaries, so treat output quality as a black box.

It's a single-purpose tool with no public API for the extension itself and no self-hosting option. Reliability depends on YouTube's transcript availability - videos without captions or auto-captions produce weaker results - and the extension only runs inside Chrome.

Editor's take

A solid, no-frills entrant in a crowded category. The timestamped outline is the feature that earns it shelf space - most cheap competitors give you a wall of bullets with no way back into the video. The undisclosed model and Chrome-only distribution keep it from being a top pick for serious researchers.

— The AI Tool Bible editorial team

Pros

✅ Clickable timestamped outlines let you jump straight to the relevant section of a video
✅ Cheap Pro tier ($7/mo) versus most competing YouTube summarizers
✅ Free plan is genuinely usable for short clips
✅ Multi-language summary output