Pinuu — Pin notes to the open web by Pinuu Inc

Pinuu is a lightweight, cross-browser extension that turns the entire web into an interactive marginalia layer. Highlight any sentence, paragraph, DOM element, or video timestamp on any webpage and attach public takes or private research notes directly to source text.

WHY PINUU EXISTS
Internet comment sections failed over a decade ago. When an author publishes an engineering essay, a company files an SEC 10-K disclosure, or a researcher shares an ML paper, the sharpest analysis happens off-site—in transient social media threads, private Slack groups, or fragmented forums. Readers of the original document never see the caveats, replication errata, or counter-arguments.

Free annotation tools failed because zero-cost posting inevitably attracts SEO spam rings, scraping bots, and low-effort outrage.

Pinuu resolves this through a combined architectural and economic fix:

1. AN ECONOMIC FIREWALL ($2.99/MO)
   Pinuu has no free tier and no free lurking. Every member pays $2.99/month (or $30/year) to read and write notes. This small economic filter eliminates automated scrapers, link spammers, and bot swarms, guaranteeing a high signal-to-noise ratio across all domains.
2. W3C TEXT QUOTE ANCHORING WITH FUZZY RECOVERY
   Pinuu does not rely on brittle CSS selectors or XPaths that break when a publisher updates their site layout. Anchors implement the W3C Web Annotation standard, capturing exact text along with prefix and suffix context strings. If an author fixes a typo or restructures a paragraph, our client-side fuzzy Levenshtein matching automatically recovers the anchor.
3. 4-PILLAR OBSIDIAN SIDE PANEL
   Press Option+P (Alt+P) or click the toolbar icon to toggle the side panel:
   • Page Stream: Real-time takes, rebuttals, and peer discussions anchored to the current page.
   • Global Feed: A live stream of takes published across the open web by people you follow.
   • My Notes: Your private marginalia, highlights, and research notes, searchable and exportable.
   • Explorer: Canonical domain feeds across Wikipedia, Substack, GitHub, SEC filings, and arXiv.
4. COMPLETE PRIVACY & ZERO TELEMETRY
   Pinuu is 100% member-supported. We do not sell ads, monetize telemetry, or record your browsing history. The extension uses an in-memory Bloom filter to check active domains client-side; if a page has no notes, no network requests are sent. All interface elements render in an isolated Shadow DOM to ensure zero style leaks or script collisions with host websites.

KEY FEATURES:
• Anchor notes to sentences, quotes, code blocks, images, and YouTube video timestamps.
• Upvote high-signal commentary and post replies directly inside the margin.
• Switch between public takes and private, unlisted research notes.
• Shareable dynamic unfurl cards (joinpinuu.app/p/:id) to cite web notes on X, Bluesky, and LinkedIn.
• 1-click subscription management with Stripe Customer Portal.

Pinuu is active on Google Chrome and Mozilla Firefox. Visit https://joinpinuu.app to learn more.