WAVE

I've tried MANY invoicing systems, and Wave is BY FAR my favourite. It looks great, auto-reminds clients when amounts are due, and has the ability to track my accounts receivable and payable with simplicity and ease. I love the mobile app too. It even has a recurring billing option and is FREE. MUST HAVE.

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SQUARE

Want to sell online or accept credit card for in-person transactions? Square has become my absolute favourite application. Not only is the reader completely free, it integrates with almost any other app, has quick transfer times (typically 24-48 hours), and allows international transactions. 

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Mylo