Features

Koko Analytics is a free and open-source plugin. You can download it from WordPress.org here.

Plug and play: After activating the plugin, stats are recorded right away.
GDPR Compliant by design.
No external services. Everything happens on your server.
No personal information or anything visitor specific is tracked.
No cookies (optional).
Metrics: All the essentials: total pageviews, unique pageviews and referral URL’s.
Referrer spam: Built-in blocklist to filter out referrer spam
Fast: Handles thousands of daily visitors or sudden bursts of traffic without breaking a sweat.
Lightweight: Adds less than 900 bytes of data to your pages.
Efficient storage: a year worth of data takes up less than 5 MB of data.
Cached: Fully compatible with pages served from browser and server caches.
Open-source: GPLv3 licensed.
Translated: Fully translated into English, German, Dutch, Spanish, Japanese, Croatian, Swedish, Danish, Finnish, Italian and Russian.

Koko Analytics Pro

Koko Analytics Pro is a paid add-on plugin for the free plugin, which adds several powerful features:

Periodic email reports: daily, weekly or monthly email reports
Outbound link tracking: tracks all link clicks to any external website.
Track form submissions: automatically tracks submitted forms and the page it was submitted from.
Custom event tracking: the ability to track any custom event through a simple JavaScript API.
Pageviews column: show the number of pageviews over a configurable time period right inside your WP Admin’s posts and pages table.
Export to CSV: export the raw data for any dashboard view to CSV for advanced analysis.