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.
Pay once, use forever · 14-day money-back guarantee · No subscription
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.
All tools run locally
Split, clean, convert, merge — everything happens inside Excel’s own process. Works the same with the network cable unplugged.
AI is optional — and bring-your-own-key
The command bar uses your own Anthropic API key, stored only on your device. Don’t want AI? Never turn it on. Every tool works without it.
Only your words are sent. Never your cells.
When you type “split the name column,” that sentence is the only thing the AI sees. Your data stays in the sheet, on your disk.
02 — The tools
Thirty-four jobs Excel makes harder than they should be.
Every tool opens a plain-language wizard — dropdowns, column pickers, and a live before/after preview. No formulas to write. No syntax to learn.
Pro tools
Unlocked with your licenseConvert Text to Date
Turn “dates” stored as text — 03/04/2025, 4-Mar, 20250304 — into real Excel dates that sort and calculate correctly.
Lookup Values
Match values between two lists — everything VLOOKUP does, chosen from dropdowns instead of written by hand.
Merge by Key
Combine two tables by a shared key column and pick exactly which columns come along. No helper formulas.
Combine Sheets
Stack many sheets or files into one clean table — headers aligned automatically, source tracked.
Unpivot
Reshape wide monthly-columns data into a tall, analysis-ready table. The pivot-table prep step, without the pain.
Split Names
Break full names into first, middle, and last — titles, suffixes, and messy spacing handled for you.
Extract Text
Pull out exactly the part you need — before, after, or between characters — no MID/FIND gymnastics.
Standardize Values
Map inconsistent entries — “NY”, “N.Y.”, “new york” — to one clean value across the column.
Merge Cells
Join several columns into one with your own separator — and lose nothing, unlike Excel’s native Merge.
Convert Text to Number
Turn numbers trapped as text — currency signs, commas, (parentheses) — into real numbers that sort and total.
Split to Rows
Explode a cell packed with several values into one row each, repeating the rest — the row-wise Split.
Match Doctor
Find why a lookup returns #N/A — trailing spaces, hidden characters, text-vs-number — and repair each key so it matches. Nobody else diagnoses this.
Reconcile
Diff two lists by a key: added, removed, changed, or unchanged — labelled on a new sheet. Cross-platform, unlike Microsoft’s Windows-only tool.
Merge Duplicates
Collapse rows that share a key into one — joining the other columns’ distinct values or summing their numbers. The roll-up companion to Remove Duplicates.
Regex Find & Replace
Run a regular expression across your selection to replace every match or extract just the part you want — a natural fit for the command bar.
Spell Number
Write a column of numbers out as English words — plainly, or as a titled currency amount like “One Thousand Dollars and Fifty Cents”.
Cluster Values
Fuzzy-group near-identical entries — “Acme”, “ACME”, “Acme Inc.” — into one canonical spelling, so a pivot or lookup treats them as the same. Runs on your computer.
Column Health Scan
One command → a per-column report on a new sheet: blanks, distinct values, duplicate rate, types, and issues like hidden characters or numbers stored as text.
Round Numbers
Round a column to a set number of decimal places — or the nearest 10 or 100 — to nearest, always up, or always down.
Normalize Phone Numbers
Bring a column of phone numbers to one consistent form — E.164 or digits only — so mismatched formats stop breaking lookups and dedupes.
Convert Formulas to Values
Freeze formulas to their current results, in place — so the numbers stay put even if their inputs change, move, or get deleted.
Free tools
Included free with every installEvery option-based tool ships with a clickable wizard and a live preview — see how it works in Excel.
03 — How it works
Three steps. The third one is a choice.
Tell
Type what you want in plain English — “split the name column into first and last” — or pick a tool from the ribbon and answer a few dropdowns. Whichever you’re comfortable with.
Preview
Tellsheet shows you the exact result before anything happens — a live before/after of the affected cells. Wrong column? Odd edge case? You see it here, not after.
Apply
Click Apply and the change lands in your sheet. Don’t like the preview? Cancel, and your data is exactly as you left it. And every change is recorded in a built-in history — reopen it to see what changed and revert any step, even after you save, close, and reopen the file.
04 — Who it’s for
Built for the people who actually run the numbers.
Analysts
You get exports that arrive wide when you need them tall, dates stored as text, and names crammed into one column. Unpivot, convert, and split them in seconds — with a preview instead of a prayer.
Accountants
Client data is confidential — pasting it into an online cleaner isn’t an option. Tellsheet works entirely on your machine, so the ledger you clean is a ledger that never left your care.
Ops people
Every week: the same messy roster, the same lookup between two lists, the same trailing spaces. Tellsheet turns your recurring cleanup 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.