Thesaurus

Thesaurus is a Mac app for finding synonyms and similar phrases. A small window takes any term the user enters and expands to show a varied set of alternative words and phrases. The app is listed as Thesaurus – Powered by AI, and it is meant for finding just the right word for a sentence while writing, without opening a full dictionary or reference tool.

Thesaurus is designed for current large language models that run both on the device and in the cloud. Because of this, it handles more than single words: it understands common turns of phrase, slang and acronyms, and returns alternatives for them as well. Results appear in a leather-styled window, which can be set to one of four visual styles.

Thesaurus is free and runs only on the Mac, requiring macOS 26.0 or later. Its interface is in English. The developer, Kyle Halevi, states that no data is collected from the app. The app has no in-app purchases, and its most recent update focuses on bug fixes and general improvements rather than new features.

Use cases

• Finding a better word for a sentence while writing
• Finding alternatives for slang, idioms and acronyms
• Rewording a whole phrase rather than a single word