The best real-time collaboration infra in 2026

Across the leading products, the category splits between collaborative editing, shared presence, and lower-level realtime transport. Tiptap stands out for customizable document editors with co-editing, imports, and AI-assisted writing; Liveblocks emphasizes ready-made multiplayer UI, comments, notifications, and copilots; Ably Realtime is geared toward durable pub/sub, chat, presence, and globally scaled messaging infrastructure.