CLI

The sounday command line tool - check files for AI tells offline and rewrite them through the API.

Run it with npx (Node 18 or newer), no install needed:

alias sounday='npx -y --package=https://sounday.ai/dl/sounday.tgz sounday'

Check (free, offline)

sounday check README.md content/          # files or directories (.md, .mdx, .txt, .html)
sounday check content/ --min-score 60     # exit code 1 if any file scores below 60
sounday check post.md --format json       # machine-readable
cat draft.txt | sounday check -           # stdin

Code blocks, inline code, HTML tags and front matter are ignored, so only your prose is scored.

Rewrite (API)

export SOUNDAY_API_KEY=sd_...
sounday rewrite post.md                               # prints the rewrite
sounday rewrite post.md --write                       # updates the file in place
sounday rewrite post.md --strength light --keep "flat feet,Acme Run 3"
sounday rewrite - --json < draft.md                   # full API response

A summary goes to stderr: style score before and after, whether facts were verified, chunks kept as original, and your monthly usage.

Other commands

sounday usage                         # plan and words used this month
sounday signup --email you@example.com
sounday mcp                           # MCP server on stdio