Conner Tolley

A simple plugin that will send a email stating the number of unique visitors the site has had in a certain time period.

Visitor Mailer

Receive email of visitors on a daily or weekly basis, NO additional plugins or add-ons are required.

Tareq Hasan

A simple plugin that tracks registered users login statistics per day. You can track how many registered users are signing in to your site everyday.
No extra configuration needed. Just creates a plugin page in admin panel and displays everydays user login count.
Want to contribute? <a href="https://github.com/tareq1988/User-Login-Stat" rel="nofollow ugc">Fork here</a>

Visitor Mailer vs User Login Statistics