I use
Diabetes Journal. It keeps weight, glucose, A1C, blood pressure, carbs, meds and exercise (I only keep weight, glucose, BP and A1C). It also allows notes for each entry, so I keep which side (top or bottom) of which finger the glucose reading is from, so I don't end up sticking the same finger all week. And I make a note in the weight entry if, for example, we go out to eat and I blow my diet for one day that month (which I'm doing tomorrow, since the grandkids are staying here for the weekend, so we're taking them out for supper tomorrow). It gets a bit slow after there's a year's worth of entries in it, but it's still usable. (And, I gues, I could rename the Helium backup, clear all the data and start fresh every year. [Yes, I back up the data to my SD card every day, and the backups to the cloud every week.])
Free if you don't mind the little banner ad at the bottom.
There
are apps that will connect to your glucometer to take the readings automatically, but the cables are usually about $30-$50, which I think is ridiculous to save a few seconds of data entry.