Glasp Alternative — Build Your Own Web Highlighter
Glasp is great if you like the social, public-by-default model. If you want a private highlighter where you fully own the data and can integrate it into your own knowledge system (Notion, Obsidian, Supabase), building your own with PlugThis fits better.
About Glasp
Glasp is a social web highlighter Chrome extension that lets users highlight and annotate webpages, save quotes, and share their highlights publicly with a community of readers. It also includes AI-powered features for summarizing and processing highlights.
Pricing: Glasp is free for the core highlighter. Some advanced features may be paid. Their business model includes a community/social layer with public highlight sharing.
Audience: Knowledge workers, students, and curators who read a lot online and want to save and process insights.
PlugThis vs Glasp
| Feature | PlugThis | Glasp |
|---|---|---|
| Pricing | $89 one-time | Free (with paid features) |
| Privacy | All highlights stored locally or in your chosen backend | Default public sharing model |
| AI summary | Yes — your own keys | Yes — built-in |
| Social/sharing layer | No (build your own if needed) | Yes |
| Cross-device sync | Use Supabase or Notion as backend (you set up) | Built-in via Glasp account |
| Source code access | Full source | Closed |
| Custom highlight categories | Build any taxonomy you want | Glasp's schema |
| Export highlights | Any format (you build) | Glasp formats only |
What Glasp does well
- Polished UX with intuitive highlight selection
- Strong social/community angle for users who like sharing reading lists
- AI integration for processing highlights into summaries
- Cross-device sync via Glasp account
Build it yourself with PlugThis
Build time: Under 10 minutes
What you get:
- Privacy: highlights stored locally, not on a third-party server
- AI summarization: highlight a long passage, get a one-line summary
- Export to any format you want — Markdown, JSON, CSV, direct to Notion
- No social pressure: highlights are private by default
- Custom categories and tags that fit your knowledge system
- Source code: integrate with your existing tools (Roam, Obsidian, Anki)
Build a Chrome extension called "Personal Highlighter" that lets users highlight and save text from any webpage. The extension should: (1) inject highlight functionality on every webpage — when text is selected, show a small floating "Highlight" button near the selection, (2) on click, save the highlight to chrome.storage.local with: the highlighted text, the page URL, the page title, surrounding context (50 chars before and after), timestamp, and an optional user note, (3) inject visible highlight styling on the selected text (yellow background) that persists when the user revisits the page, (4) provide a popup showing all highlights from the current page with edit and delete buttons, (5) include an options page with an export feature (export all highlights as JSON or Markdown), (6) optional: integrate with Notion API to sync highlights to a Notion database. Permissions: storage, activeTab. Host permissions: <all_urls>. Manifest V3.
Pricing comparison
Glasp
Free for core, paid for advanced features
PlugThis
$89 one-time + optional API costs if using AI features
On cost, Glasp wins. PlugThis wins on privacy and integration flexibility.
Other alternatives to explore
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Remio alternative
Remio alternative — build your own AI research and knowledge management Chrome extension with PlugThis. $89 lifetime, full ownership.
Eightify alternative
Eightify alternative — build your own AI YouTube summarizer Chrome extension with PlugThis. $89 lifetime, your own API keys, full code.
Build your own Glasp alternative now.
Paste the prompt above into PlugThis and ship your custom version in minutes.
Disclosure: PlugThis is a competing product to Glasp. This comparison is intended for users actively evaluating both options. We last verified the Glasp information on this page on 2026-05-14. Pricing and features may have changed since — please check the Glasp website for current details.
Glasp alternative — FAQ
Can my highlighter sync across devices like Glasp does?
Yes — set up a Supabase backend (PlugThis can do this in the build) so highlights sync via your own database. Or save to a Notion database for built-in cloud sync. Either way, you control where the data lives.
Does PlugThis include the social sharing features Glasp has?
No — those require building a separate web app for sharing, which is outside Chrome extension scope. PlugThis is for the highlighter itself. If you want public sharing, you'd build a web app separately.
How are highlights persisted across page visits?
When you revisit a page, the extension reads stored highlights for that URL and re-applies the highlight CSS to the matching text. If page content changes (rewritten article), highlights may not match — handle this by storing surrounding context for fuzzy matching.