What are some alternatives?
When comparing Imagify.co and Yoast Plugins, you can also consider the following products
WP Smush - Reduce image file sizes, improve performance and boost your SEO using the free WPMU DEV WordPress...
Gravity Forms - Gravity Forms is one of the best and easiest contact form plugins to create modern forms for websites powered by widely-used WordPress.
Wordfence - Comprehensive security plugin for WordPress.
TinyPNG - Make your website faster and save bandwidth. TinyPNG optimizes your PNG images by 50-80% while preserving full transparency!
WP Rocket - WP Rocket offers a caching plugin for Wordpress.
Bitfinex - Bitfinex is the largest and most advanced crypto-currencies trading platform.