The best alternatives to Slimvoice are Stripe, Free Invoice Generator, and QuickBill. If these 3 options don't work for you, we've listed over 10 alternatives below.
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AssemblyAI— Speech-to-Text API with superhuman accuracy
Free invoice generator. 10 different PDF templates, possibility to customize the invoice (logo, color, currency, discount, tax). Also after the invoice is created, you can save the pdf, send a link or e-mail.
Light-invoice is a simple invoicing tool that saves all your data on your computer, you can create customers, products, taxes and discounts. You can customize the labels and logo of your invoice, and use your stmp email server to end your invoices.
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