I like this idea. I mean, how often do you see an ad for Facebook ads or Google AdWords?! They do pop up every now and again, but are infrequent at best.
That's a very cool app. I gave it a try when you first posted it on HN and now I'm a regular user! I find it much better than similar native apps, especially because of the offline mode (most invoicing apps seem to lack this). Anyway, thank you for the free tier - works a treat for my needs!
Just tried using the free tier to send an invoice - was pretty good. Have to say, the experience was a fair bit cleaner than quickbooks. Just wondering, do you render your PDFs on your server or in the browser?