Yes, wao.io is free to use. It is available as a free plugin on WordPress.org.

How many websites use wao.io?

wao.io has 10 active installations as tracked by WordPress.org.

What are the best wao.io alternatives?

Popular alternatives to wao.io include WP-Optimize – Cache, Compress images…, WP Super Cache, WP Fastest Cache – WordPress Cache…. You can compare them side-by-side on our comparison pages.

Does wao.io work with the latest WordPress?

wao.io has been tested up to WordPress 5.4.19. It requires WordPress 4.6+ and PHP 5.6+.

PluginSift

wao.io

Name: wao.io
Rating: 5 (2 reviews)
Author: wao.io

wao.io is a free plugin to test loading time and security of your wordpress site.

By wao.io·Cache·Free

5(2 reviews)

·10 active installs·Updated 5 years ago

Download Visit Homepage Compare

As of April 2026, wao.io is a WordPress cache plugin with 10 active installations and a 5/5 rating from 2 reviews. It has been downloaded 1.8K+ times in total. Requires WordPress 4.6+ and PHP 5.6+. Available on WordPress.org since 2020. Last updated 5 years ago — may have compatibility concerns. Top alternative: WP-Optimize – Cache, Compress images….

5/52 reviews

10active installs

1.8K+total downloads

6 yearssince 2020

Overview

wao.io is a free plugin to test loading time and security of your wordpress site.

Performance Features

Image Optimization

The intelligent image optimization algorithm radically reduces file size without suffering a loss in quality.
You can choose between three levels of image compression.
wao.io optimizes your images by converting the original image into the best matching output format that your customer’s client is capable of rendering.

Lazy Loading

Using lazy loading, your images will be loaded only shortly before they are visible to the user.
Preloading image placeholders in the size of the original images will prevent your site’s layout from jumping around.
You decide which placeholder option integrates best in your overall webpage design