Sigil: 4chan

Sigil adds a social identity and reputation layer on top of 4chan — the largest anonymous imageboard. FEATURES: • Vote & Claim — Upvote/downvote posts. Claim authorship with your Sigil ID. • Shill Detection — AI-powered radar flags coordinated campaigns, recycled images, and time-cluster attacks. • NSFW Filter — Blur or block explicit images and text with adjustable sensitivity. • Perpetual Network — Save threads forever. Discuss them even after 4chan archives/deletes them. • Private DMs — End-to-end messaging between Sigil users, off the boards. • AI Summaries — One-click thread summaries powered by Gemini (bring your own API key for unlimited use). • Watchlist — Track threads and get notified when they update. • Leaderboard — See top personas by reputation score. • Sigil Pro ($4/mo) — Unlimited archives, watches, AI summaries, network replies, advanced shill analytics, cross-board image dedup, and data export. Privacy-first: shill detection runs entirely in your browser. No post content is ever sent to our servers.