The best alternatives to Invoice At Once are Billdogg, Slimvoice, and Invoice.app. If these 3 options don't work for you, we've listed a few more alternatives below.
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Slimvoice is a free service. The business model is that when you accept a card payment via Stripe, I will collect a 1% application fee. It's as plain and simple as that. ... When you connect your Stripe account and accept card payments, you are helping keep Slimvoice up and running.
Invoice.app is a simple, easy to use and powerful invoicing app. It has been carefully designed and developed to offer the best user experience. It’s perfect for freelancers, contractors and small business owners. Currently available only on iOS.
If you’re an entrepreneur, freelancer or running a service-based business then this is the perfect tool to save you time and effort while invoicing. It’s easy to use on-the-go and allows you to create and send invoices in just seconds. Best of all, it’s FREE! Say goodbye to the days of word docs and spreadsheets and hello to FreshBooks.
Effortless Invoices uses your git history generate online payable invoices quickly. It approximates time spent in projects and provide you a summary of daily activity to itemize your invoice, and provides you an easy to use interface to adjust your invoice. It includes cli tools to let you generate invoices and share payable URI from command line