The spreadsheet runtime for agents
A headless, excel-compatible calc engine with branches, diffs and review, driven over an API and MCP, by your agents and your team.
CellCheckWhat IfInsightsChanges
To fix B9 is typed in, but no formula uses it
Your xlsx and csv files, on your Mac
Open, edit and save Excel files and csv as they are. The original is kept before the first save.
It sees your tables
Tables, headers, inputs and results are outlined as you type. One click makes a block a real table.
It says what comes next
Select a column of numbers beside its months and the next three appear, ready to accept.
Every change kept
History for every cell, branches to try an idea, and a way back to any earlier version.
Built for agents
MCP-first: an agent connects, creates a workbook, writes cells, reads slices. Self-serve keys, no dashboards required. People get the same power in the browser.
- 1Connect over the API or MCP: self-serve, one key
- 2Create a workbook and write cells; formulas evaluate on the server
- 3Branch it, let an agent make changes, review the diff
- 4Merge when it's right: every version stays addressable