Cash flow forecasting that stops surprises before they happen
Casterly is cash-flow forecasting software for small businesses. Connect your bank and QuickBooks, and Casterly projects your running cash balance up to 90 days ahead, then warns you by email, SMS, or Slack weeks before you'd dip below a safe balance, so a cash crunch never catches you off guard. Start your free trial.
What Casterly does
Your profit-and-loss says one thing and your bank balance says another. Casterly closes that gap. It turns your real inflows and outflows (invoices, bills, payroll, rent, taxes, loan payments) into a single forward view of the cash you can actually spend, and keeps it current automatically as money moves.
Growth quietly eats cash: payroll, materials, and taxes all come due before your customers pay. That timing gap is what leaves profitable businesses overdrawn, and it's exactly what Casterly is built to make visible. Instead of rebuilding a spreadsheet every Sunday, wrong again the moment a client pays late or an expense slips your mind, you get a live forecast that updates itself and flags the specific days and drivers behind an upcoming dip, with enough lead time to actually do something about it.
How Casterly helps
90-day cash-flow forecast
A daily projected balance for the next 30, 60, or 90 days, built from your scheduled and recurring cash, not a static spreadsheet that's wrong the moment something changes.
Low-balance alerts
Casterly watches your forecast and tells you first, by email, SMS, or Slack, weeks before your balance is set to fall below your safe buffer.
What-if scenarios
Ask "Can I afford a new hire?" or "Can I buy a truck?" and see the impact on your runway before you commit, with no spreadsheet rebuild required.
Bank & QuickBooks sync
Securely connect your accounts in minutes. Casterly reads balances and open invoices and bills, read-only, so the forecast stays accurate on its own.
Who it's for
Casterly is built for owner-operators and small businesses that are profitable but feel cash-tight: HVAC and trades companies, agencies, contractors, and growing service businesses where payroll, materials, and taxes come due before customers pay. Compare Casterly with other tools on our comparisons page, or see guides by industry.
Frequently asked questions
How does Casterly forecast my cash flow?
It projects your bank balance forward day by day using your scheduled and recurring inflows and outflows, plus balances and open invoices/bills synced from your bank and QuickBooks.
Is my banking data safe?
Yes. Connections are read-only and access tokens are encrypted. Casterly can see your balances and transactions to build the forecast, but it can never move money.
Do I need a credit card to try it?
No. Casterly offers a free trial with no credit card required. Connect your accounts and see your forecast right away.
Does Casterly work with QuickBooks?
Yes. Connect QuickBooks Online and Casterly pulls in your open invoices and bills so scheduled cash in and out is reflected automatically in your forecast.
Start your free trial ยท Become a Caster (affiliate program)