Start with one file

Bring the spreadsheet your business runs on.

SheetTamer checks it, then keeps the books it was trying to be. Receipts you snap are read, dated and filed by month. Your accountant sees the same files, month by month.

I run a business

Drop it in. See what doesn't add up.

It is checked for totals that don't foot and formulas that break the pattern. Then your accountant sees it, and every receipt and statement you add after.

Check my spreadsheet free → Set up my office

Takes about a minute.

I'm an accountant

Stop chasing shoeboxes.

Every client's documents in one place, organized by month. Ask for what's missing with one click, and see "March is ready" instead of guessing. Your clients get a link that says send your stuff here, from you. Clients can arrive with their spreadsheet already checked.

Create your practice workspace →

Free for practices. Always.

How the month travels

From the spreadsheet to signed off.

One pile becomes one room becomes one clean handoff. Watch the whole trip.

01 · Small business Excel, today

Forty tabs, patched formulas, and flags nobody has time to chase.

02 · The room SheetTamer

duplicate charge invoice past due March is ready

Everything files itself. The month checks itself off.

03 · Your accountant CPA, ready

Engagement ready. Nothing to chase.

The whole month arrives organized, with the talking points already found.

Set up my office → I'm an accountant

For your business

The spreadsheet, grown up.

Drop it in

A file, a statement, or a whole year

Drop in the spreadsheet, drag in a statement, or add last year's pile all at once. Every document files itself under the month it happened, not the month you found it.

They see it instantly

No email, no chasing

Your accountant sees the same pile the moment it lands. If they need something, a request shows up in your room, and clears the moment you add it.

Close the month

"March is ready"

When everything is in, one tap tells your accountant the month is complete. They review, ask questions right on the document, and close it. Done means done.

Receipts, too

Snap it at the counter. It files itself.

Photograph a receipt and SheetTamer reads it, dates it and files it under the month it happened. Your accountant sees it the moment it lands, alongside that month's spreadsheet and statements.

New: where your money is going

It reads your books. Then it does the math you never get to.

leak

"Insurance is up 45%." A category jumping against its own history, caught the month it happens instead of at tax time.

leak

"This vendor may have charged you twice." Same vendor, same amount, days apart. Two taps to see both receipts side by side.

watch

"A new subscription started three months ago." The charge you forgot you agreed to, still billing. Intentional? Dismiss it. Forgotten? That is money back.

leak

"Invoice 1041 is 32 days past due." Money already earned and still sitting out there. Already paid? Dismiss it and it stays gone.

trends

Spend by month, top categories, top vendors, all built from your own books. Load last year tonight and the whole picture exists by morning.

Every flag shows its evidence, and you have the last word: confirm what's real, dismiss what's intentional. Nothing is decided for you.

For accountants & bookkeepers

Clients arrive organized.

clients

Every client's room on one screen: documents by month, what came in this week, and which months are ready for you.

requests

"Still need the March bank statement" becomes one click. Your client gets the message, and the month can't be marked ready until it's cleared.

comments

Questions live on the document or the month they're about, not in an inbox. Both of you see the whole thread, in context.

invites

You get a link that says send your stuff here. Your client taps it, their workspace arrives already connected to you, with their details filled in.

findings

SheetTamer flags where each client's money is leaking: category jumps, vendor price creep, duplicate charges. You walk into the monthly call with the talking points already done.

A practice workspace is free, always, with every client and every feature. We never charge for seats or clients on your side.

Create your free practice workspace → More for practices →

Start here: the spreadsheet check

Find the number that doesn't add up before your accountant does.

Most real spreadsheets contain errors (Panko, University of Hawaii, audits of real workbooks), and the ones that slip through rarely stay small. SheetTamer checks every workbook: totals that no longer foot, tabs that stopped tying to each other, numbers typed over formulas. Deterministic first, plain English always, and every finding traces to a cell.

Try it right now, free, on the spreadsheet you least trust. Your file is checked in memory and never stored; the findings are all we keep. Two checks run free; the deeper three run inside.

Check a spreadsheet free →

No signup, no commitment. Just what we find.

Q1-reconciliation · Marlin Coffee LLC.xlsx 3 issues found

Account	Jan	Feb	Mar	Total
Sales	12,400	13,100	14,050	39,550
COGS	4,220	4,510	4,860	13,590
Payroll	6,100	6,100	6,100	18,300
Net income	2,080	2,490	3,090	9,660

SheetTamer: This total doesn't foot. The column sums to $7,660, but the cell reads $9,660. Off by $2,000, a hardcoded number where a formula should be.

Pricing

Simple, and free where it should be.

The checker · free

For anyone with a spreadsheet

Drop in a workbook and see what is wrong with it. No account, no card, and a free monthly allowance of checks. Your file is never stored.

Check a spreadsheet

For accountants

Free. Always.

Every client, every feature, no seat fees, and no clock on your own workspace. We never charge the practice side. Each client you invite starts with 30 days free.

Create practice workspace →

Business · from $19/mo

For a business that runs on it

Starter is $19 a month, or $190 a year, for the solo set with up to two people. Pro is $39.99 a month for three people and up. Both start with 30 days free.

Set up my office

Every workspace starts with 30 days free, nothing held back. If you stop paying, your records stay readable and exportable, always.

Security & trust

Built like the books depend on it.

checked

Free checks run in memory and are discarded the moment they finish. In the room, a spreadsheet check is read on your device and only the findings are sent to us. Receipts and other files you add are stored in your workspace.

on record

Every document, request, role change, and money finding is audit-logged. What happened in the room is always answerable.

encrypted

Documents live in private storage behind expiring links; service credentials are encrypted with AES-256-GCM. Card details are handled by Stripe and never touch our servers.

yours

Your records are never held hostage: a lapsed workspace stays readable and exportable, forever. We delete your records and files when you ask in writing. Issued reports and their history are kept as a record.

audit

The Company has implemented controls designed to align with the applicable AICPA SOC 2 Trust Services Criteria.

Start with one file.

Bring the spreadsheet. The books follow.

Set up a room for your business, or a free practice workspace for your clients. Either way, the pile gets a place, and the chase gets a close button.

Set up my office → I'm an accountant

Start with the free check: one spreadsheet, right in your browser.