Zloth

Alternative comparison

Glasp alternative

If Glasp feels broader than what you need, Zloth is a focused YouTube summarizer Chrome extension built around one click from the YouTube feed.

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Key Takeaways

  • Zloth is a focused Glasp alternative for Chrome users who want fewer steps.
  • The main difference is the starting point: Zloth starts on the YouTube thumbnail, not in a separate link-paste workflow.
  • Zloth saves summaries into folders, so useful videos become a reusable library instead of throwaway AI output.
  • Glasp can still be the better pick if you want learners who already use glasp for web/pdf highlighting, public highlights, exports, and a broader personal knowledge workflow.

First-party comparison proof

How we compared these YouTube summarizers

Last updated: June 14, 2026

  • We compared Zloth, Eightify, Glasp, and NoteGPT using public product pages, pricing pages, and Chrome Web Store listings where available.
  • We focused on YouTube-summary workflow, free tier, pricing, clickable timestamps, custom prompts, saved-summary organization, and whether users can avoid copy-pasting links.
  • Competitor claims are limited to facts visible on public pages checked on June 14, 2026. Pricing and feature limits can change.
  • Zloth claims are first-party product claims based on the current Chrome extension: thumbnail summaries, Summary and Analysis modes, Pro custom prompts, saved folders, sync, and text-to-speech.
Source Checked Used for
Eightify website June 14, 2026 Feature claims, positioning, platform coverage
Eightify Chrome Web Store listing June 14, 2026 Free trial, Chrome extension claims, feature list
Glasp YouTube summarizer page June 14, 2026 YouTube summary features, model/prompt claims
Glasp pricing June 14, 2026 Free and paid plan limits
NoteGPT YouTube summarizer page June 14, 2026 YouTube summary features, batch/playlist claims
NoteGPT pricing June 14, 2026 Paid plan pricing and quota claims

A free alternative to Glasp

Zloth is the simpler Glasp alternative when you want YouTube-first summaries from thumbnails, a private saved library, folders, and Chrome-only focus.

  • Zloth: summarize from thumbnails, avoid tab switching, save summaries into folders, sync across devices.
  • Glasp: Learners who already use Glasp for web/PDF highlighting, public highlights, exports, and a broader personal knowledge workflow.

When Glasp is the better pick

Glasp is a good pick if YouTube summaries are part of a larger highlighting and note-export system across web pages, PDFs, Notion, Obsidian, and Readwise.

Public pricing note: Free plan includes 3 basic YouTube summaries per day. Paid plans list Pro at $12.50/month when billed annually and Unlimited at $30/month.

YouTube summarizer comparison table

A practical feature comparison focused on workflow, free tier, organization, and pricing.

Competitor facts checked against public pages in June 2026.

Criteria Zloth Glasp
Best fit YouTube-first Chrome users who want summaries before opening videos. Learners who also highlight, export, and build a public knowledge trail.
Summarize from thumbnail Yes. Zloth adds a Summarize button directly to YouTube thumbnails and watch pages. Promoted as a Chrome extension and URL-based summarizer with on-page summaries.
No copy-pasting links Yes. The core workflow happens inside YouTube. Yes with the extension; URL paste is also promoted.
Clickable timestamps Yes in Summary mode. Yes. Timestamped transcripts and summaries are promoted publicly.
Custom prompts Yes on Pro. Yes. Custom prompt support is promoted publicly.
Saved and organized library Yes. Summaries save to a personal library with folders and sync. Yes, as part of a broader highlights, notes, and exports workflow.
Text-to-speech Yes. Built-in TTS, with Pro AI TTS minutes. Not a primary public YouTube summarizer claim on pages checked.
Free tier Free to start with 120 summary credits per month. Free plan lists 3 basic YouTube summaries per day.
Entry paid price $5.99/month or $49.80/year for Pro. $12.50/month when billed annually for Pro.
Chrome-only focus Yes. Focused on Chrome and YouTube. No. Chrome, Safari, Edge, Firefox, iOS, and Android are promoted.
When Zloth is the better pick When you want the fastest in-flow decision: summarize from the feed, save it, organize it, and move on. Choose Zloth over Glasp if you do not want a broader social highlighting system.

Screenshots and media

See the Zloth workflow

These are first-party product captures: thumbnail summaries, timestamp output, and the saved summary library.

Summarize from the YouTube thumbnail

Zloth places the action before the click, so you can decide whether a video is worth opening.

Clickable timestamp summaries

Summary mode turns long videos into timestamped notes you can jump through.

Zloth folder library with saved YouTube summaries

Saved summary library

Useful summaries become a reusable library with folders and sync.

Actual review

Actual review: where Zloth wins

Zloth is best when the YouTube feed is the starting point. Its strongest advantage is not a longer feature list; it is reducing the steps between seeing a video and knowing whether it is worth your time.

Best for

  • Students screening lectures and tutorials before committing to a full watch.
  • Researchers and professionals who want timestamped notes without losing their browsing flow.
  • People who want summaries saved into folders instead of temporary AI chat output.

Not the best fit for

  • Users who need mobile apps more than a Chrome-first workflow.
  • Users who want a broad highlighting, PDF, or all-in-one AI study suite.
  • Teams that need batch processing of many links at once.

Glasp feature notes

Glasp promotes YouTube transcripts, timestamped summaries, custom prompts, multiple AI models, multiple languages, and transcript highlighting.
Glasp pricing separates Basic YouTube Summaries from Advanced YouTube Summaries.
Glasp is broader than YouTube: web/PDF highlighting, exports, PDF chat, audio transcription, and social learning are core parts of the product.

Un-copyable proof

Example first-party Zloth summary

A real Zloth-style summary of our own 20-second product demo transcript.

Zloth product demo

  • 00:00 - The problem: opening every YouTube video wastes time before you know whether it is worth watching.
  • 00:04 - Zloth adds the summary action directly to the YouTube thumbnail.
  • 00:08 - The extension can return timestamps, key takeaways, and custom-prompt answers.
  • 00:12 - Summaries are saved into folders and synced across devices.
  • 00:16 - The CTA is simple: add Zloth to Chrome and learn more while watching less.

Try Zloth free in Chrome

Use the next YouTube thumbnail as the test. If the summary answers the question, you can skip the video or save it for later.

Add to Chrome - Free Back to hub

Frequently Asked Questions

Is Zloth a free Glasp alternative?

Yes. Zloth is free to start and is a focused Glasp alternative for Chrome users who want to summarize YouTube videos from thumbnails and save results into folders. Glasp is a good pick if YouTube summaries are part of a larger highlighting and note-export system across web pages, PDFs, Notion, Obsidian, and Readwise.

What does Glasp do well?

Glasp is a good pick if YouTube summaries are part of a larger highlighting and note-export system across web pages, PDFs, Notion, Obsidian, and Readwise.

Does Zloth summarize YouTube videos without copying links?

Yes. Zloth adds a Summarize button directly to YouTube thumbnails and watch pages, so you can stay in YouTube instead of pasting links into another tab.

Is Zloth free?

Yes. Zloth is free to start with 120 monthly summary credits. Pro is $5.99/month or $49.80/year for heavier use.

Does Zloth save summaries?

Yes. Every summary is saved into your personal library, and you can organize summaries in folders and sync them across devices.

Sources checked

Competitor features and pricing change. These public pages were checked on June 14, 2026 for the first-pass comparison.

Eightify website (June 14, 2026) Eightify Chrome Web Store listing (June 14, 2026) Glasp YouTube summarizer page (June 14, 2026) Glasp pricing (June 14, 2026) NoteGPT YouTube summarizer page (June 14, 2026) NoteGPT pricing (June 14, 2026)