So I recently jumped on the iPad train, I decided to try and maximize my money with this thing so I went looking for some apps to help out my business. I ran across invoice2go. While it is more aimed towards stores and have products that you sell, it works extremely well at least for my needs.... Estimates are very easy too, just imput the info and it adds it all up and put it in the correct spot and everything else. I started off with the lite version and quickly foundt it to be very user friendly and easy. Once I reached my 3 document limit for the lite version I already knew that I would be spending the 14.95 on the PRO version. I imputed my clients with all of their information, set up the invoice how I would like it to look, added my logo, and boom I could fire out invoices really quickly. Just describe what you did, put the price and move on. Then hit print or email and your ready to get paid. I have to say it was really easy to use, I pushed out 15 invoices in just under 5 minutes. You can back it all up to a computer so you don't have to worry about losing any of it. I think you can even create your own invoice template but I'm happy enough as it is right now so maybe I will try that out later. Overall for me and my small needs it works fabulously. Hoped this may be helpful to some, I was just so happy with it I thought some others may want to try out the free version and see if it's for you. Good luck!