Search "best cash flow software" and you'll get a dozen listicles ranking the same six tools in a different order, usually sponsored by one of them. Here's a more honest breakdown by what kind of business actually needs what.
If you need full bookkeeping plus forecasting
QuickBooks and Xero are the default choice for a reason. Both handle invoicing, expense tracking, payroll (in some regions), and cash flow reporting in one place. The forecasting features are decent but general-purpose: they project based on historical patterns across your whole business, not broken out by individual project or client.
Good fit if: you want one tool for everything and don't need project-level detail.
If you already have bookkeeping sorted and just need forecasting
Float and Pulse (and similar dedicated forecasting tools) plug into QuickBooks or Xero and add a sharper forward-looking view: scenario planning, "what if this invoice is 30 days late" modeling, that kind of thing.
Good fit if: your books are already handled by an accountant or existing software, and you specifically want better forward visibility on cash position.
If you run multiple projects and need to know which ones are profitable
This is the gap general tools don't cover well. QuickBooks can tell you your total cash position. It won't easily tell you that Project A is 30% margin and Project C is losing money once you factor in the hours you put in.
Flinance is built around this specific question. Every transaction ties to a project by default, so the dashboard shows margin per project, not just a blended total. It also separates cash flow (when money actually moves) from an accrual view (when the work was actually delivered), which matters if you get paid in advance or in installments and don't want that timing to distort which projects look healthy. The Pro tier adds project risk flags, so a project trending toward a loss gets caught early instead of at tax time.
Good fit if: you run three or more concurrent projects or clients, and "my bank balance looks fine" hasn't stopped a project from quietly losing money before.
How to actually decide
Ask yourself one question: when a client payment lands, do you know within a few seconds which of your active projects it belongs to and what that project's running margin looks like? If yes, whatever you're using now is probably fine. If you'd need to open a spreadsheet and do some math, that's the signal to look at project-based tools specifically, rather than another general accounting suite.
Free trials exist for a reason. The fastest way to know if a tool fits is to import a month of real transactions and see if the resulting view actually answers the question you started with.