Disclosure first: I built VidBrief. I'm going to compare it against the two most-asked-about competitors — Eightify and Glasp — and try to give you a usefully honest answer about which to pick. I have a bias and you should weight what I say accordingly. Where I think a competitor is genuinely better for a use case, I'll say so.

If you want to skip to the answer: Eightify if you want a browser extension that overlays YouTube; Glasp if you're a heavy highlight-and-curate user; VidBrief if you want a dashboard, citation-grounded chat, and a cross-video knowledge base.

The full case below.

Product positioning, in one sentence each

Eightify — Chrome/Firefox extension that adds a summary panel to YouTube. Started as a one-feature tool (summaries) and grew sideways into chat.
Glasp — Highlight-and-curate-the-web tool with strong YouTube support. Treats videos as one of many content types you collect snippets from.
VidBrief — Standalone web app. Paste URL → summary + outline + transcript + citation-grounded chat + cross-video knowledge base. Built around the idea that "every claim should be verifiable in 3 seconds."

Pricing

Numbers below are as of May 2026. Check each site for current pricing.

Plan	Eightify	Glasp	VidBrief
Free tier	5 summaries/day	Unlimited highlights, AI summary capped	10 videos/month, no card
Entry paid (monthly)	~$10/mo	~$10/mo	$12/mo
Entry paid (yearly)	~$60/yr ($5/mo)	~$80/yr ($6.7/mo)	$96/yr ($8/mo)
Top tier	$20-30/mo	$15/mo	$35/mo (Business)
Lifetime deal available	Occasionally (AppSumo)	No	No

Eightify is the cheapest at the entry tier. Glasp is in the middle. VidBrief is slightly more expensive at $8/mo yearly because the pricing reflects the cost of running ASR fallback (Paraformer-v2) and vector search on every processed video.

Feature comparison

Feature	Eightify	Glasp	VidBrief
One-paste summary	✅	✅	✅
Chapter outline with timestamps	✅	Partial	✅
Click timestamp → seek player	✅	✅	✅
Full transcript display	Partial	✅	✅
ASR fallback (videos without captions)	❌	❌	✅ (Paraformer-v2)
Chat with the video	✅	❌	✅
Chat answers cite [mm:ss] timestamps	Partial	N/A	✅
Cross-video search / knowledge base	❌	Partial (highlight collection)	✅ (pgvector)
Highlight + clip individual quotes	❌	✅ (their core feature)	Partial
Notion export	✅	✅	✅
Obsidian / Markdown export	Partial	✅	✅
Discord webhook integration	❌	❌	✅
Channel subscriptions + keyword alerts	❌	❌	✅
Browser extension overlay	✅ (their core delivery)	✅	Roadmap
Mobile app	❌	❌	❌ (responsive web)

Each tool wins on its founding feature. The decision is about which workflow matches you.

Where each one wins

Eightify wins when

You watch YouTube directly in the browser and want zero context switch. Open YouTube, click the icon, see the summary in a sidebar. Doesn't get any lower friction.
You only need summaries, not a knowledge base. Eightify's strength is the speed-of-summary loop. If you don't need to query across videos later, the simpler product is the better product.
You're on a tight budget. Their entry-tier yearly is the cheapest of the three.

Glasp wins when

You're a heavy highlight-collector across many content types. Glasp's killer feature is treating YouTube videos like web pages — you can highlight a specific quote, save it to a collection, share collections with others. If your second brain is built around quote-level snippets (not whole-video summaries), Glasp is purpose-built for that.
You value the social / discovery layer. Glasp has a community feature where you can follow other curators and see what they highlight. None of the others have anything like it.
You're a student or researcher. The Glasp UX assumes you're going to come back to the highlight later and write about it.

VidBrief wins when

You consume serious volume. Processing 5+ videos a day starts to feel like a job without a knowledge base. The vector-indexed cross-video search ("what did I hear about X across the 50 videos I watched this month") is the feature that compounds.
You watch non-English content, especially Mandarin/Japanese. ASR fallback via Paraformer-v2 (Alibaba DashScope) is materially better than Whisper for these languages, and meaningfully cheaper. Eightify and Glasp don't transcribe videos without captions at all — they just skip them.
You want every answer to be verifiable. Chat with [mm:ss] citations on every claim is the difference between an AI helper and an actual research tool. You can click any answer and verify in 3 seconds at the source.
You live in Notion / Obsidian / Discord. Integrations are first-class, not afterthoughts. Channel subscriptions + keyword alerts route directly to your Discord webhook with a digest of new uploads matching your topics of interest.

The accuracy question

All three tools use frontier LLMs for the summarization step (some version of GPT-4, Claude, or DeepSeek). For factual extraction — what was said, when, who said it — accuracy is uniformly high. The differences in summary quality are smaller than the differences in interface (where the summary lives, how you verify it, how you query it later).

The bigger accuracy concern is hallucination on follow-up questions. If you ask the AI a question and it answers without citations, you have to trust it or scrub through the source video to verify. VidBrief's per-claim [mm:ss] citations were specifically designed for this — you click any claim and the embedded player jumps to that exact second. Eightify's chat layer cites timestamps sometimes; Glasp doesn't really have a chat layer. If verifiability matters to your use case, VidBrief is the only one of the three that takes it seriously as a design goal.

What I won't tell you

I'm not going to claim VidBrief has 99% accuracy because I don't have rigorous benchmarks. Nobody in this category does — the closest thing is people running the same 5-10 videos through each tool and counting subjective accuracy, which isn't science. Treat all summarizer accuracy claims with skepticism.

I'm not going to tell you Eightify or Glasp are bad. They're good products built by smart teams who chose different tradeoffs. If their tradeoffs match your workflow, they're the right answer for you.

I'm not going to tell you VidBrief is "the best." It's the best at the specific job I built it for — verifiable, high-volume YouTube research with a cross-video knowledge layer. For other jobs, other tools are better.

How to decide in 5 minutes

Try this three-question filter:

Do I watch enough YouTube that I'd want to query across all of it later? If yes → VidBrief. If no → keep going.
Do I want to stay on youtube.com and not context-switch to a separate tab? If yes → Eightify. If no → keep going.
Am I a highlight-and-quote collector across multiple content types? If yes → Glasp. If no → default to the most-tested-against-your-use-case option.

All three have free tiers. The fastest way to decide is to take 3 YouTube videos you watched recently and try all three on the same set. The right answer is whichever tool's output you'd actually use.

A note on switching

Switching summarizers is essentially zero-cost — the videos live on YouTube, the summaries are commodity LLM output. You can start with one and move to another in an afternoon. Don't agonize over the choice; start with the one that fits your first-week use case and migrate later if you find a better fit.

If you want to try VidBrief on the free tier (10 videos a month, no credit card), that's the lowest-friction option. If you'd rather start with Eightify or Glasp, both have free tiers too.

The worst outcome is staring at this comparison for an hour and then not trying any of them. Pick one, paste 3 URLs, see if it's useful.