One platform for every client you serve.
Whether you are a bookkeeping firm, an accounting practice, a virtual CFO or a fractional finance team, FynOS gives you one place to run every client, whatever they already use to sell, buy and keep the books. It is modular: turn on the parts a client is missing and leave the rest of their stack in place, so you add the most value for the client and for your firm.
FynOS keeps each client's record reconciled every day. Your firm does the finance work on top.
Who it fits.
Firms whose clients are consumer brands doing roughly $3M to $50M a year, selling through a storefront and marketplaces such as Amazon, Walmart and Faire, and carrying their own inventory. If a client's month end starts with downloading payout reports and rebuilding cost of goods in a spreadsheet, it fits. It fits best where you look after several such brands and the same work repeats across them.Clients doing roughly $3M to $50M a year, on a storefront and marketplaces, carrying their own stock.
Fits the stack each client already has.
Each part works on its own.
Each part works on its own. Fill the gaps in a client's stack, and leave what already works.
What your team stops doing.
Tying out channels and payouts
Payouts opened up and matched to the bank.
Rebuilding cost of goods
Landed cost on every sale, not an estimate.
Keying journals
The day's entries prepared in the client's chart.
Matching bills by hand
Bills matched line by line, gaps named.
Hunting for exceptions
Exceptions queued with the amount at stake.
Pulling reports on request
Clients ask Claude, read-only, instead of waiting.
Where you add more.
With the record current, the conversation with the client moves from what happened last month to what to do next. The working capital view shows days in stock by category, days to collect by channel and days to pay by vendor, with slow stock, suppliers paid ahead of terms, channel mix and early payment discounts missed, each with its amount. Contribution by channel, after marketplace fees and cost of goods, shows where margin is going.
With the record current, you advise on what to do next, not what happened last month.

Controls built in.
Your own role in each company
The role each client grants, module by module.
Maker and checker
No self-approval, and no bank file before approval.
A trail behind every number
Each entry opens to the records behind it.
Who does what.
FynOS
- Pulls every channel, bank and supplier document
- Matches orders, payouts and deposits
- Costs stock and every sale
- Prepares the day's journals
- Flags what did not tie
Your firm
- Reviews the exceptions
- Posts and closes the month
- Files the returns
- Advises on cash, margin and stock
- Owns the client relationship
Two ways to work together.
Refer a client
Introduce a brand you work with. We run the working session on its data, and you stay its accountant.
Run it inside your service
Use FynOS as part of the service you deliver and bill the client yourself.
How it starts.
One client's month of data
Channel reports, bank statements and bills, one month.
A working session
Where the cash sits; the client keeps the findings.
Live in about three weeks
Channels, bank and books connected, entries flowing.
How we measure it
A baseline for reconciliation accuracy, unresolved exceptions and close time, then the change over the client's first two month-end closes.A baseline first, then the change over two month-end closes.
Who supports you
The founders run onboarding with your team and stay your contacts after go-live.The founders, from onboarding on.
Book a working session for your firm.
Pick a date and time.
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