Describe the change. Watch the grid update.
The Ask Theo rail edits your live sheet — formulas, styling, and web enrichment. Step through three common asks.
Formulas, written for you. “Total revenue by quarter” becomes a live SUM that recalculates as you edit — a real formula engine, not a static table.
A real spreadsheet with an AI copilot
Everything you expect from a grid — and a teammate who does the tedious parts.
Excel-grade engine
Live formulas, number formats, merges, frozen panes, and multi-tab workbooks — a real grid, not a table widget.
AI edits the live grid
Ask Theo to add formulas, restructure columns, build summaries, or fix data — edits land with a change log.
Find & Enrich
Point Theo at a list of companies or people and enrich it from the public web — new columns appear on your grid.
Styling by request
“Make the header row bold with a green fill” just works: colors, borders, merges, and conditional formatting.
Import & export .xlsx
Bring in Excel files with formulas, formats, and validations intact — and export back to .xlsx or .csv anytime.
Version history
Every AI turn and autosave becomes a restorable version. Preview any point in time and roll back with one click.
Sharing & presence
Share as editor or viewer, see collaborators' live selections, and keep everyone on the latest version automatically.
Built from chat
Ask Theo in chat for “a budget tracker for my agency” and get a working spreadsheet with live formulas seeded.
Data tools
Sort, filter, data validation dropdowns, freeze panes, hyperlinks, and conditional-format rules — all AI-addressable.
How it works
Start or import
Create a blank sheet, ask Theo to build one from a brief, or import an existing .xlsx with formulas and formatting intact.
Ask Theo to work the grid
Describe the change — formulas, cleanup, styling, summaries — and watch the edits land with highlighted ranges.
Enrich from the web
Turn a column of names into a researched dataset: Theo finds sites, details, and contact info and writes new columns.
Share and export
Invite your team with live presence, keep version history as your safety net, and export to .xlsx or .csv whenever.
Frequently asked questions
Do real Excel formulas work?
Yes. Theo Sheets runs a full formula engine — SUM, VLOOKUP, IF, COUNTIF, and hundreds more recalculate live as you edit. Imported .xlsx formulas keep working, and exports write real formulas back to Excel.
What can the AI actually do to my spreadsheet?
The Ask Theo rail edits the live grid: writing values and formulas, inserting and restructuring rows and columns, styling ranges, sorting and filtering, conditional formatting, data validation, merges, and building summary tables. It reports exactly what changed, and version history lets you roll anything back.
How does Find & Enrich work?
Select a list — companies, leads, tools, anything — and tell Theo what you want to know. It researches each row on the public web and fills new columns with what it finds, marking anything it couldn't verify.
Can I import my existing Excel files?
Yes. Import .xlsx or .csv and keep formulas, number formats, merges, column widths, frozen panes, hyperlinks, and validations. Anything that can't cross the boundary is reported honestly instead of silently dropped.
Is Theo Sheets collaborative?
Share sheets as editor or viewer, see teammates' live cursors and selections, and let the version history track who changed what. Owners can review and restore any prior version.
Ready to try Theo Sheets?
Free to start, no credit card needed, and your whole team can join.