Use local AI
Install a supported local model when you want help turning prose into proposed facts, dates, or cause-and-effect links.
Chronal StudioComing soonDesktop
Know what was true.
Trace why.
Chronal Studio is a desktop app for notes, facts, and events that change over time. Your writing stays in ordinary files on your computer. Studio helps you see what was true on a chosen date and which source supports the answer.
No account or cloud workspace required. AI is optional, and suggested facts never enter your project until you review them.
The continuity problem
Your notes say what happened. Chronal helps you understand when and why.
Long-running projects accumulate people, places, claims, decisions, and consequences. The latest note rarely explains what was true earlier—or which event made the current answer true.
Chronal keeps your writing connected to reviewed facts and events. You can move through a timeline, follow relationships, ask a question, and see the source behind the answer.
From a note to an answer,
without copying your project.
Every view reads the same files, so the timeline, graphs, and answers stay connected to the writing you started with.
- 01Readable text
Write the source
Write people, places, events, claims, and notes in Markdown, a simple plain-text format.
- 02You approve changes
Review the facts that matter
Add dates, changing facts, who knew what, and cause-and-effect links. Nothing suggested by AI is saved without your approval.
- 03Answer + evidence
Ask and verify
Ask what was true at a chosen time, see what changed, and open the exact source that supports the answer.
One product family
01 / DesktopA desktop app backed by one time-aware engine.
Chronal Studio
The desktop app where you write, explore a timeline or graph, ask questions, and check the source behind an answer.
Explore Studio →02 / CoreChronal Engine
The local logic that calculates what was true at a chosen time and keeps Studio, terminal tools, and connected agents consistent.
Understand the Engine →Different projects.
Different questions about change.
Keep a fictional chronology coherent, follow evidence across connected records, or explain why a changing fact was true at a particular time.
Fiction workflow · Perception Anchor
Keep a fictional history coherent
What happened between 2029 and 2048?
Research workflow · Somebody's Gotta Help Me
Follow an investigation across records
Which events are connected, and how?
Included public demo · Greyhaven Demo
Resolve a changing fact
Who was mayor in 1825, and why?
AI is a choice
Local AI—always local, always reviewable, always optional.
Chronal's built-in AI can read selected writing and suggest facts or events. The model runs on your computer, its suggestions stay separate from your saved project, and you decide what to keep.
Bring your own agent
Optionally connect Codex, Claude Desktop, or another compatible agent through Model Context Protocol (MCP), a standard way for an agent to use Chronal's project tools. An outside agent may use a cloud service, so its own privacy terms apply.
Use neither
Writing, timelines, graphs, point-in-time views, questions, and source tracing all work without a local model or a connected agent.
Built for trust
Your project remains yours.
Local files are the foundation.
Projects are ordinary folders with readable notes and small data files that store the facts and events you approve.
Suggestions are never authority.
Optional local AI can suggest facts and events. You review, revise, accept, or reject them.
Answers carry their evidence.
Chronal shows which source supports an answer, what earlier information it replaced, and when the answer applies.
Bring time into the workbench.
Chronal Studio is coming soon. Until then, explore the product through Greyhaven Demo and see how a source becomes a traceable answer.