If you're using Mi Band then you can make use of the following Apps.
1. Mi Fit : This is official app for counting distance, walked steps and sleep duration. This app also has other features related to data display and other stuff.
2. Noom Walk Pedometer : This app also keeps track of the steps taken by the user. it can keep a log of the previous and current performance for you to analyze.
Out of these two I think Mi Fit is a bit buggy and there is lot of things they need to improve upon. So if you can use any pedometer application then go ahead with that for now.