Social identity, reputation, and protection layer for 4chan. Vote, claim posts, detect shills, and build your reputation.
Add to Chrome - FreeUpvote quality content and claim your posts with your Sigil ID. Build a track record even on anonymous boards.
Fingerprint-based detection identifies coordinated campaigns, repeat shills, and suspicious posting patterns.
10-tier weighted voting based on your track record. Good-faith users carry more weight than fresh accounts.
Two-layer protection: board-level auto-blur on NSFW boards, plus client-side skin-tone analysis on SFW boards. 100% local.
Get quick AI-powered summaries of long threads using your own Gemini API key. Bring Your Own Key — we never see it.
Send encrypted DMs to other Sigil users. Private conversations that stay between participants.
Add Sigil from the Chrome Web Store and sign in with Google to create your identity.
Sigil adds action bars to every post — vote, save, claim, mark, and share without leaving the page.
Your votes, claims, and activity build a reputation score. Higher reputation = more voting weight.