Zinn® CacheZinn® Cache — free
A page cache on any web server, a Redis object cache, purging by tag and safe exclusions for shops and signed-in visitors. It is already installed on every WordPress site we host.
Zinn® Cache or Zinn® Cache Pro: what does Pro add?
Zinn® Cache is the free page cache and object cache. Zinn® Cache Pro is a paid add-on that installs on top of it, for analytics, a slow-query finder, a faster object cache and lighter pages.
Zinn® Cache Pro — paid add-on
Installs on top of the free plugin: cache analytics, a slow-query finder, a faster object cache, smart purging, cache warm-up, WebP and AVIF images, unused-CSS removal and delayed JavaScript. Annual licences for one, five or unlimited sites, with a free trial.
Free or Pro?
Zinn® Cache is the free page cache and object cache. Zinn® Cache Pro is a paid add-on that installs on top of it, for analytics, a slow-query finder, a faster object cache and lighter pages.
| Zinn® Cache | Zinn® Cache Pro | |
|---|---|---|
| What it is | The cache: free, on any WordPress site | A paid add-on that needs the free plugin |
| Full-page cache | On any server: LiteSpeed's own cache, or a file cache | Adds cache warm-up and smart purging |
| Tag-based auto-purge | Yes | Yes |
| Object cache | Redis | Adds an in-memory APCu tier, prefetching and compression |
| Cache exclusions | Paths, query parameters and cookies | Adds cache rules for individual pages |
| Cache warm-up after a purge | No | Yes |
| Unused-CSS removal, delayed JavaScript, WebP and AVIF | No | Yes |
| Scheduled database clean-up with a preview | No | Yes |
| Cache analytics and a slow-query finder | No | Yes |
| Cache health and alerts in the Zinn Digital® dashboard | No | Yes |
| Updates | From Zinn Digital® | Through Freemius, with your licence |
| Licence | GPLv2 or later, free | GPLv2 or later; an annual licence for one, five or unlimited sites |
| Requires | WordPress 6.6+ · PHP 8.2+ | WordPress 6.6+ · PHP 8.2+ |
| WordPress.org | Listed in the plugin directory | Sold through Freemius, not the directory |
Why Pro is a separate plugin
The free plugin is the cache, and it stays complete: nothing in it is held back or switched off to sell Pro. That is also what lets us install it on every site we host and submit it to WordPress.org.
Pro is for a site that has outgrown guessing. It measures what the cache is doing, finds what is slow and makes each cached read cheaper. Because it builds on the free plugin, removing it leaves a working cache behind.
Installing Pro
Keep Zinn® Cache installed and active, then install Zinn® Cache Pro. Start a free trial from the Pro tab in Zinn® Cache's settings, or buy a licence; Freemius handles the checkout and the licence.
Coming from Zinn® Cache Engine
Zinn® Cache Engine, the earlier plugin for sites hosted elsewhere, is retired. Install Zinn® Cache, whose page cache now works on any server, check the site, then deactivate and delete Cache Engine.
Included free with Zinn Digital® hosting
Get Zinn® Cache free on Zinn Digital® hosting
Every WordPress site on our own servers comes with Zinn® Cache installed and connected: the page cache is on, the Redis object cache is managed for you, and plugin updates arrive on their own. Zinn® Cache Pro is not included; add it to any site when you want it.