Works on phones with or without built in step counters. This free version still gives your step count and distance on the widget. You also get charts showing your steps per hour and steps per day. The settings section still provides you the choice to archive or export your data for further analysis.
Other charts and features available in the paid version including: distance per hour, distance per day, step cadence (speed you walked broken down by minute)
You need to go in to your app list and add the Aardvark Pedometer Widget to your screen. The icon that shows up when you install is the analysis portion. You can use that icon to access charts and settings or click on the "Aardvark Pedometer free" button at the top of the widget.