Tell Cash Calendar what's in the bank, which invoices you're waiting on and what's going out. It lays your money out week by week, using the dates clients actually pay, flags the weeks that dip too low, and suggests the admin that helps: invoice sooner, remind earlier, ask for a deposit.
Illustration: the week of 7 December dips below a £500 buffer. That's the week to act on now.
No sign-up for the trial, no bank connection. Full access: £12 one-off (or 25,000 sats) for 12 months, opening soon.
Experiment #2 from the Noor Lab · built on Claude
of payments to UK small businesses arrive late, and a late payment typically lands about three weeks after its due date. (Hiscox Late Payments Report, via ByteStart, Feb 2026)
the average a small business is owed in late payments each year, according to the same survey of 1,000 owners and sole traders.
a year freelancers say they lose to admin and paperwork. (Smallpdf survey of 397 freelancers, via ContentGrip, 2026)
Forecasting tools exist, but most are built for companies with bookkeepers and connected accounting software, priced monthly. If you're a one-person business, you mostly need to know one thing: which week is going to hurt, and what can I do about it this Friday?
Illustrative examples, shortened. Cash Calendar only knows the numbers you give it.
13 weeks (up to 26) of money in, money out and running balance, from your own figures. Cautious version on request. CSV for your spreadsheet.
Which invoices to send now, who to remind and when, renewals to pause, bills worth asking to move, and a 15-minute Friday routine.
No tax calculations, no loans or credit, no investing, no “can I afford it”. It points you to GOV.UK, an accountant or free debt advice when that's what you need.
Each is a separate product with its own price.
Full access £12 or 25,000 sats, opening soon. Try it free now, and join the waitlist inside the app to hear first.
No. You type or paste the numbers you want it to use, rough is fine. Nothing is pulled from your accounts, so there's nothing to link and nothing to unlink.
No. Cash Calendar is an AI planning tool that does arithmetic on your own figures and suggests admin tasks. It doesn't give financial, tax, lending or investment advice. For tax, speak to an accountant or check GOV.UK; if bills are getting on top of you, StepChange, National Debtline and Citizens Advice offer free, confidential help.
No, that depends on your situation and belongs with an accountant or HMRC's own tools. If you already set aside a figure, tell Cash Calendar and it will include it as a line in your weeks.
It's built on Claude, made by Anthropic. Your messages are sent to Anthropic's API to write the reply. Cash Calendar doesn't store your conversations; they live in your browser tab. Use client nicknames if you prefer, and avoid pasting personal data you don't need to.
As accurate as the numbers you give it, and AI can make arithmetic slips, so glance over the running balance before you rely on it. It's a planning view, not a promise about when anyone will pay.
A fair-use cap that keeps the price low. A weekly check-in uses a handful of messages. It resets on the 1st of each month.