Hi! I use an app called "Private Diary" and it is free though the Google Play store via my 4G Android phone.
It isn't "horsey", per se, but it does contain all the things/abilities which it seems you are looking for.
You make a new entry for each date and time, you are able to choose various colors and fonts to write in (perhaps one for each horse you are looking at buying, each topic, such as feed or appointments, that sort of thing), & it allows you to put photos in, which could be very helpful if you are on a "new horse search" (lucky ducky)! ;°}
It has a password to get in, and that's quite handy. If you upgrade to the pay version for I believe $1, you can do even more, though I'm not sure what else one would really need.
Anyhow, give it a look and see if you like it...
Best of luck to you! B2H :0)
"I'm too busy working on my own grass to notice if yours is greener"
Last edited by Back2Horseback; 02-09-2013 at 06:59 AM.