I'm a solo developer and I built the first version of this app a couple of years ago. This is the third major rewrite and I've added a ton of functionality since then (i.e. recurring invoicing, kanban, reply by email, more flexible user roles, etc). I'd love to hear any feedback you guys have - about the actual app, the landing page, or anything else. Always looking to make it better and more appealing. I'll be completely honest, marketing has been...very challenging for this product, but occasionally there will be a huge boost in traffic and sales will go up pretty quick, I just haven't been able to make it sustainable.
Here's the HN discussion from when I posted the first version a couple of years ago: https://news.ycombinator.com/item?id=5698741
I already got approval from dang to post again since it's been so long and a lot has changed about the app.