InvoiceKoi

InvoiceKoi helps independent tradespeople and small service businesses prepare estimates, invoices and receipts on Android. Save client details and price-book rates for repeat jobs, turn an estimate into an invoice, and keep track of deposits, time and expenses. Core invoicing works offline, so preparing paperwork does not depend on a reliable connection at a job site. AI features, cloud backup and payment collection need internet access. Drafting is free. Issuing, printing or sharing new numbered documents requires a subscription, with US pricing of $9.99 per week or $99.99 per year; local prices vary. The website also has a separate free browser invoice generator. It needs no account, adds no watermark, keeps invoice details in the browser and uses the browser print dialog to save a PDF.