Jeff Starr

Sends a detailed notification email when admins and other users log in to your site. Choose the user levels/roles for which you would like to receive login notifications. Optionally exclude users and/or IP addresses.
This plugin is useful for keeping an eye on any unauthorized administrator or user logins. Each email alert includes the user name, IP address, user agent, and other details. Very useful for forensic investigations.
<blockquote>
👁️ Keep an eye on things..
</blockquote>
Features
<ul>
<li>Send email alerts for any user level/role</li>
<li>Option to exclude alerts for any user ID</li>
<li>Option to exclude alerts for any IP address</li>
<li>Send alerts to additional email addresses</li>
<li>Automatically send alerts to main Admin user</li>
<li>Option to disable alerts for main Admin user</li>
<li>Provides detailed information about each login</li>
<li>Lightweight and fast: total plugin size < 100KB</li>
<li>Simple to use: configure a few options and done</li>
<li>No permanent changes are made to anything</li>
<li>Easy peasy mac and cheesy</li>
</ul>
<blockquote>
👇 Check out the <a href="https://wordpress.org/plugins/simple-login-notification/#screenshots" rel="ugc">screenshots</a>
</blockquote>
Why is this useful?
I use this plugin to keep an eye on any unauthorized login attempts. Probably a bit paranoid but I don’t care, paranoid works well for me.
How is this plugin different?
While researching for this plugin, I found four other “admin login notification” type plugins:
<ul>
<li><a href="https://wordpress.org/plugins/email-notification-on-login/" rel="ugc">Email Notification on Login</a></li>
<li><a href="https://wordpress.org/plugins/email-notification-on-admin-login/" rel="ugc">Email notification on admin login</a></li>
<li><a href="https://wordpress.org/plugins/kaya-login-notification/" rel="ugc">Kaya Login Notification</a></li>
<li><a href="https://wordpress.org/plugins/kolorweb-access-admin-notification/" rel="ugc">KolorWeb Access Admin Notification</a></li>
</ul>
Unfortunately none of these plugins suited my specific needs:
<ul>
<li>Lightweight, clean and simple</li>
<li>Current with latest WordPress</li>
<li>No requirement for PHP sessions</li>
</ul>
So I decided to build my own. Let me emphasize the utter simplicity of this plugin. It does one thing and does it well: sends an email whenever an admin-level user logs in to WordPress. No bells and whistles, no bloat. If you need more functionality, check out the above plugins should get you there.
Privacy
This plugin does not collect or store any user data. It does not set any cookies, and it does not connect to any third-party locations. The only thing this plugin does is send an email for each admin-level login. Each email includes information about the user, such as username, IP address, user agent, and other details.
Simple Login Notification is developed and maintained by <a href="https://x.com/perishable" rel="nofollow ugc">Jeff Starr</a>, 15-year <a href="https://plugin-planet.com/" rel="nofollow ugc">WordPress developer</a> and <a href="https://books.perishablepress.com/" rel="nofollow ugc">book author</a>.

Simple Login Notification

Sends a notification email when admins and other users log in to your site.

Azumi93

This plugin will send you an email every time a user logs in your website as an admin. 
It displays the date the user logged in and their IP address.
<h3>Premium WordPress Login Notifications</h3>
The wait is over and the premium version of the plugin is here. 
You can buy it <a href="https://premiumwordpressloginnotifications.com/" rel="nofollow ugc">from here</a>
Features of the premium plugin are: 
– Choose which roles to track (admin, author, contributor, etc) 
– Stores user activity in a log and allows you to download it in CSV file 
– Choose which IPs to ignore (good for development) 
– Send emails at multiple e-mail accounts 
– Lifetime free updates 
– Add the username of the logged in user in the emails/logs

Email notification on admin login

Sends an email to a pointed email address when an admin user logs in

Simple Login Notification vs Email notification on admin login