Pdfslick Sync

PDFSlick Sync is here to make PDF collaboration feel like it wasn't built in 1995. They deliver a drop-in SDK that adds real-time comments, annotations, and multiplayer cursors to any PDF viewer in your app—in about 30 minutes. One import, a few lines of code, and suddenly your PDFs have Google Docs-level collaboration powers. The secret sauce is their edge-native sync architecture, which pushes coordination points literally to whichever server is physically closest to your users, delivering sub-50ms latency anywhere on earth. That means cursor movements feel instant, not laggy like some video call where everyone's talking over each other.

The privacy angle is smart too: your documents stay exactly where they are—in your S3, your bucket, your infrastructure. PDFSlick never stores the actual file. They only sync the "ink": coordinates, cursors, comments.Zero document storage means zero liability. They're currently in early access with free pricing for individual devs and $0 for Pro while they onboard their founding cohort, so if you're building anything with PDFs— proposals, contracts, design specs, tax forms—this is the cheat code to not rebuilding collaboration from scratch. Welcome to the future of document workflows.