BillFast is a lightweight invoice generator for freelancers and solo businesses. Add a client, line items, tax, currency, and payment instructions; check the live preview; then download a ready-to-send PDF. Free includes 3 watermarked PDF downloads. Pro is £7/month for unlimited downloads and watermark-free invoices. Built for independent designers, developers, writers, consultants, and other freelancers who need an invoice instead of a full accounting suite. Available in English and Russian.