Sigil: 4chan

Social identity, reputation, and protection layer for 4chan. Vote, claim posts, detect shills, and build your reputation.

Add to Chrome - Free

Vote & Claim Posts

Upvote quality content and claim your posts with your Sigil ID. Build a track record even on anonymous boards.

Shill Radar

Fingerprint-based detection identifies coordinated campaigns, repeat shills, and suspicious posting patterns.

Reputation System

10-tier weighted voting based on your track record. Good-faith users carry more weight than fresh accounts.

NSFW Filter

Two-layer protection: board-level auto-blur on NSFW boards, plus client-side skin-tone analysis on SFW boards. 100% local.

AI Thread Summaries

Get quick AI-powered summaries of long threads using your own Gemini API key. Bring Your Own Key — we never see it.

Direct Messages

Send encrypted DMs to other Sigil users. Private conversations that stay between participants.

How It Works

1

Install & Sign In

Add Sigil from the Chrome Web Store and sign in with Google to create your identity.

2

Browse 4chan Normally

Sigil adds action bars to every post — vote, save, claim, mark, and share without leaving the page.

3

Build Your Reputation

Your votes, claims, and activity build a reputation score. Higher reputation = more voting weight.