Dume.ai - AI Executive Assistant to Simplify Your Workday

Part of Dume Office, currently in beta.

Dume Sheets is a native .xlsx spreadsheet editor in Cowork desktop. It opens and saves real Excel files on your machine, and Dume’s AI copilot is built into the editor itself.

Opening a sheet

Ask in chat: “Build a spreadsheet to track Q4 hiring” opens Dume Sheets with a starting structure.
New File inside Dume Office for a blank spreadsheet.
Open an existing .xlsx from Cowork; it launches in Dume Sheets already editable.

See Dume Office for all three entry points in detail.

What the copilot can do

Because the copilot has the spreadsheet open, it can do anything you’d otherwise do by hand: build out a new sheet from a description, clean up messy data, add or fix formulas, restructure columns, or explain what a sheet is doing before you rely on it. Point it at a specific tab or range rather than the whole workbook for a tighter result.

Build a spreadsheet to track Q4 hiring: Role, Owner, Status, Start date
Clean up column C, the dates are inconsistently formatted
Add a formula in D that totals column C
Explain what this sheet is calculating
Restructure this so each region has its own tab

Google Sheets vs. Dume Sheets

Dume Sheets edits a local .xlsx file. If you instead want Dume to edit a spreadsheet that lives in Google Drive without ever downloading it, use the Google Sheets integration. To move a Google Sheet into Dume Sheets, download it, edit it locally, then push it back to Drive when you’re done; see Working with Google Drive files.