Connect Claude or ChatGPT to your books.

Get answers about your QuickBooks Online Canada books from the AI assistant you already use. Nothing changes until you approve.

Start free trial Ask for a demo

Works with Claude Code · Claude Desktop · ChatGPT

Claude · ChatGPTExample

Any sales-tax issues this month?

4 expenses are missing a tax code. The fixes are drafted and waiting for your approval.

Who it’s for

Two ways to use it.

Cosigne is a hosted connector that lets Claude and ChatGPT work with QuickBooks Online Canada. Bookkeeping firms and business owners sign in from their own AI assistant. It reads, searches and drafts changes, and nothing is written to QuickBooks until a person approves. It checks GST/HST, PST and QST, and works in French and English.

For bookkeeping firms

Each bookkeeper connects their own AI assistant and works on the client files they’re allowed to see.

Search, report on and clean up every client file
GST/HST, PST and QST review on every file
Restrict bookkeepers by client
An activity log of who did what

From $199 a month for 10 client files

See the features

For business owners

Connect your own AI assistant to your own QuickBooks Online Canada company and ask in plain language.

Cash in the bank, overdue invoices and who owes you what
Profit and loss and sales-tax totals
Invite your bookkeeper into the same account
Any change is a draft you approve

$39 a month for 1 company

Cosigne was started by a business owner tired of chasing answers about their own books. Read the story

See the owner plan

Built for Canada

Canadian sales tax, checked on every transaction.

The last 12 months of every connected file are checked for GST/HST, PST and QST.

Missing tax codes, and tax that doesn’t match its code
Rates checked against the official rate on the transaction date
Unusual codes are marked “check this”, never “wrong”. The province is never guessed.

See every check and rate

Your AI drafts. You approve.

Every change your AI assistant prepares waits in the app as a draft. Nothing is written to QuickBooks until you approve.

Expense · drafted by AI · 2026-09-14

Draft Approved Rejected

Fournitures Gagnon (example)

Tax code: Missing tax code GST/QST QC
Subtotal: $200.00
GST 5%: $10.00
QST 9.975%: $19.95
Total: $229.95

Tax code ~~None~~ → GST/QST QC

Written to QuickBooks.

Nothing changed in QuickBooks.

Try it — this is a demo. Nothing is sent anywhere.

See the expected GST and QST before you approve
A draft is marked stale if the transaction changed
Closed periods are never changed

One plan for owners, one for firms.

Business owners: $39 a month for 1 company
Bookkeeping firms: $199 a month for your first 10 client files
14-day free trial, no card

Pricing details

Put your AI assistant to work on your books.

Create your account, connect QuickBooks, then sign in from your Claude or ChatGPT.

Start free trial See how it works Ask for a demo

14-day free trial · 10 client files · No card