Restrict Website Access lets you protect your entire WordPress site with a password-based access screen. It is useful when a site is private, under development, in staging, or temporarily not intended for public access.

Key features:

Password protection for the entire public-facing website.
Simple setup with no coding required.
Useful for private, staging, and under-development websites.
Editable access-screen content and layout options.
Lightweight interface with straightforward settings.

Logged-in WordPress users can continue working in the dashboard while public visitors are shown the password screen when protection is enabled.

Source Code

The plugin’s custom JavaScript and CSS source files are included in the distributed plugin under includes/admin/ and includes/public/.

The plugin also bundles the third-party Notyf library:

Project: Notyf
Source: https://github.com/caroso1222/notyf
License: MIT
Bundled location: includes/admin/library/notyf/