Yes, MO Cache is free to use. It is available as a free plugin on WordPress.org.

How many websites use MO Cache?

MO Cache has 1.0K+ active installations as tracked by WordPress.org.

What are the best MO Cache alternatives?

Popular alternatives to MO Cache 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 MO Cache work with the latest WordPress?

MO Cache has been tested up to WordPress 3.4.2. It requires WordPress 3.2+ and PHP false+.

PluginSift

MO Cache

Improving the site performance by caching translation files using the WordPress standard cache mechanism.

By m4i·Cache·Free

5(3 reviews)

·1.0K+ active installs·Updated 8 years ago

Download Visit Homepage Compare

As of April 2026, MO Cache is a WordPress cache plugin with 1.0K+ active installations and a 5/5 rating from 3 reviews. It has been downloaded 54K+ times in total. Requires WordPress 3.2+ and PHP false+. Available on WordPress.org since 2011. Last updated 8 years ago — may have compatibility concerns. Downloads are up 42% this week. Top alternative: WP-Optimize – Cache, Compress images….

5/53 reviews

1.0K+active installs

54K+total downloads

15 yearssince 2011

Overview

The MO Cache provides simple and fast caching of the translation MO files using the WP Object Cache mechanism.
This plugin is necessary to be used persistent caching plugin, otherwise you can not benefit from this plugin.

For localized WordPress, which was newly installed, the loading time of translation files accounts for 70% of the entire processing time.
You can make this process 3 times faster by just installing this plugin.

Description in Japanese （日本語での紹介記事）

Features

No configuration
Supports multiple languages
Supports plugin’s translation files caching
Supports WordPress Network/Multisite installation
A simple plugin in less than 100 lines

Read full description on WordPress.org

Screenshots

Ratings & Reviews

53 reviews

5 ★

4 ★

3 ★

2 ★

1 ★

Recent Reviews

Still in use

by WebCodePoet·3 years ago

I still use this on all my projects! Works like a charm.

Simple and Perfect solution.

by Fumiki Takahashi·10 years ago

No Admin screen. Cool and Smart.

Made A Big Difference To Our Site Performance

by poddys·12 years ago

Our WordPress site runs on an iSeries and we have problems using the main caching plugins (Supercache, T3 Cache etc). All of our pages were taking up to 10 seconds to load, mostly because of the WYSIJA (Mail Poet) and Jetpack plugins. A code trace showed that WYSIJA seemed to take forever looping through POMO and MO functions. As soon as this plugin was installed the site sped up dramatically.