Download websites that use Redis Object Cache

About Redis Object Cache

A caching plugin is a confession about traffic. Nobody installs an object cache on a brochure site that gets a visitor a week. Redis Object Cache exists because a PHP application asks the database the same questions over and over, and past a certain load the sensible answer is to keep those results in memory instead. A site carrying it has crossed the point where the default stack stopped being fast enough.

The plugin has been maintained since 2013 under an MIT licence, and its role is narrow and unglamorous. The code sits between the CMS and a Redis server, storing the results of database queries and expensive computations so they can be served without touching the database again. Installing it implies something beyond the plugin itself, namely a Redis instance that somebody has to run, secure and pay for. The dependency is why the plugin works better as a proxy for infrastructure maturity than for editorial ambition. Either the owner hired someone who knows how to operate a cache, or, more often, the host installed it for them as part of a managed plan.

As of October 2026 we record Redis Object Cache on 71,536 sites. 46,276 of them resolve to United States, and .com carries the largest block of the domains. Geography of that kind rarely reflects where a plugin is fashionable. Managed hosting is a concentrated industry, and when a provider enables an object cache across its fleet, an entire population of unrelated customers inherits the same technology on the same day.

The commercial reading is straightforward. A list of sites running an object cache is a list of sites with real traffic, a real hosting bill and a technical decision maker somewhere within reach. Performance tooling, monitoring, managed database and delivery network vendors all want that filter, because it removes the enormous population of sites that will never buy infrastructure. Hosting companies want it in reverse, to see which parts of a rival fleet have been tuned and which have not. A per domain check tells you whether a single site is cached. The dataset tells you how the caching population is distributed across hosts, countries and co installed plugins, which is the difference between a hunch about a market and a segment you can work through.

Honesty about detection matters more here than for a front end library. An object cache runs on the server and leaves no script tag, so recognition depends on secondary evidence such as response headers, admin assets, generator strings and the traces the plugin leaves in page output. Sites that strip those signals, or that sit behind a delivery network that rewrites them, will be missing from the count. Read 71,536 as a floor rather than a census, and expect the true installed base to run higher, especially inside managed hosting fleets where the plugin is switched on quietly by the provider.