Excel add-in · Windows · Mac · Web
Tell it.
Preview it.
Trust it.
Tellsheet puts a set of precise data power tools — and an optional plain-English command bar — right inside Excel. Every change is shown to you before it happens. Nothing is touched until you click Apply.
And your spreadsheet never leaves your computer.
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Tellsheet
Local
Nothing changes until you click Apply.
The command bar is optional — every tool also works as a point-and-click wizard.
01 — Privacy
Your spreadsheet never leaves your computer.
No uploads. No cloud processing. No “we take security seriously” page hiding a data pipeline. Every Tellsheet tool runs locally, inside Excel, on your machine — the same place your file already lives.
Every tool runs locally
Split, clean, convert, merge — all inside Excel’s own process. Works the same with the network cable unplugged.
AI is optional — bring your own key
The command bar uses your own Anthropic key, stored only on your device. Don’t want AI? Every tool works without it.
Only your words are sent. Never your cells.
Type “split the name column” and that sentence is all the AI sees. Your data stays in the sheet, on your disk.
02 — The tools
A tool for the job. Find yours in a click.
Every tool opens a plain-language wizard — dropdowns, column pickers, and a live before/after preview. No formulas to write. Search or pick a category to find one.
Each tool has an in-depth guide — browse all 139 guides.
03 — How it works
Three steps. The third one is a choice.
Tell
Type it in plain English, or pick a tool from the ribbon and answer a few dropdowns. Whichever you prefer.
Preview
See the exact before/after of the affected cells before anything changes. Wrong column? You catch it here.
Apply
Don’t like it? Cancel, and your data is exactly as you left it. Every change is logged and reversible.
04 — Nothing is permanent
Every change is logged — and every step can be undone.
Excel’s own undo is fragile — it forgets everything the moment you save and close, and it never tells you what changed. Tellsheet keeps a proper history instead: a running ledger of every tool you apply, each one reversible with a single click.
A ledger of every change
Open the History panel to see every tool you’ve applied, newest first — what it did, which cells it touched, and how long ago. No more guessing how a sheet got into the state it’s in.
One-click revert, with a preview
Undo any step and Tellsheet writes the original values back — showing you the same before/after preview first, so putting things right is as safe as changing them in the first place.
It travels with your file
The history lives inside the workbook itself, so it’s still there after you save, close, and reopen the file — even days later. Close the panel any time, and clear the whole log when you’re done.
05 — Who it’s for
Built for the people who actually run the numbers.
Analysts
Unpivot wide exports, convert text dates, and split crammed columns in seconds — with a preview instead of a prayer.
Accountants
Client data is confidential. Tellsheet works entirely on your machine, so the ledger you clean never leaves your care.
Ops people
The same messy roster, the same lookup between two lists — turned into a two-click routine you can trust on a deadline.
Stop fighting formulas.
One payment. Every tool, forever, on your computer. If it doesn’t earn its keep in two weeks, we’ll refund you — no questions asked.