Bill On Site is a full-featured web-based invoicing system, with a unique twist: you can use Bill On Site on your mobile phone, enabling small business owners to send invoices to their customers while still on their client’s site. All you need is a semi-recent phone – one with a web browser on it – and internet access on your phone.

Other invoicing services offer web-based access, but completely ignore the mobile web, making sending invoices on the go difficult at best, and impossible at worst. For Bill On Site, it’s our sole focus, and something we’re working on improving all the time.

All accounts come with a free 30 day trial, so if you wanted to try out the service, go ahead. No payment information is collected, so it is absolutely no-risk.

I think we could all use more “joined up thinking” when it comes to business software. There are some applications where you can’t even Export your data. And even if you can, there’s no easy way of linking it all together.

I’m trying to start solving this problem by developing my own time tracker without timers for the Mac, and eventually it will be able to export to a lot of the web applications in this article – Havest, Freshbooks, FreeAgent and so on. I’d love to know what other people think of my idea.