I spend a bit of time looking at data for my work. This app shows useful data. If the data taken by the user is sufficiently random the long term average would show a1c, if only they added it.
It has helped me see trends and control my glucose level. It is imperative that this curve is available with every data inpit, making most software furnished by manufactures useless for the user and directed primarily at the monitoring doctor
Ed Behnke about BGluMon Pro, v8.0.2