An AI-native editor for research.

Sundial lets you hand work off to agents while staying in the driver's seat. Every edit is attributed, reviewable, and yours to keep or reverse.

Devon Codex Claude Maya Sunny

Used by researchers and builders at MIT Berkeley Georgia Tech Illinois Stanford

Features

Built for human understanding.

Stay in the driver's seat

Review and track edits as precisely as you like. Batch review changes across people, agents, files, or time.

Bring your own agent

Connect Claude Code or any local agent in seconds. Or work with Sunny, Sundial's own agent, and swap between 100+ models mid-session.

Engraving of several hands at one drafting table

Real-time multiplayer

Live cursors, inline comments, and version history at edit granularity, not commit granularity.

Documents that run

LaTeX with live preview and citations. Notebooks that execute inside the document. The agent has a real computer: it compiles, runs, and fixes its own errors.

Comparison

Everything in one place.

Claude & Codex

Real-time collaborative✕No co-editing

Version history✕Commit-based

Works with any agent✕Locked to one vendor

Edit attribution✕No attributed record

Batch review✕Per chat

Sundial

Real-time collaborative✓Live, multiplayer docs

Version history✓Edit-by-edit

Works with any agent✓Any agent or model

Edit attribution✓Every edit, attributed

Batch review✓Across chats

Collaborate on work you can trust.

Free early access