macOS only
Things 3

things3-cli

A native Things 3 command-line interface for macOS. This Go port aims to mirror the original open source CLI while shipping a single fast binary.

Install (from source)

git clone https://github.com/ossianhempel/things3-cli
cd things3-cli
make install

What it does

Create and update tasks via the Things URL scheme, delete todos, projects, and areas via AppleScript, plus read tasks from the local Things database. Includes commands to list projects, areas, tags, and tasks.

things add "Plan the sprint"
things add-area "Work"
things today
things search "inbox"