Moby Thesaurus

The world's largest English thesaurus

Moby Thesaurus is a free and open-source website for searching the largest thesaurus in the English language. The thesaurus itself has been around since the early 1990s, but until recently its content was only available on clickbaity websites with terrible interfaces and lots of banner ads. In 2014, I set out to change that by creating The site is fast, contains no ads, works well on mobile, and is open-sourced on GithHub.

Mobile Friendly

Moby works on mobile devices, too. Add it to your home screen for quick access.

Moby on Mobile

Javascript API and CLI

Moby is also available as a Node.js package on at It includes a programmatic JavaScript API as well as a command-line interface (CLI):

npm install moby --global
moby simple