Free tool
Personal Voice
Measure how you actually write, then teach your AI assistant to draft like you.
Sample
Two short posts by a made-up writer, measured the same way your writing would be:
Most of my week is meetings I didn't ask for. So on Fridays I close the calendar and build the thing I've been putting off. Last Friday it was the onboarding email. It took two hours and it's the best thing I shipped all month. That's the whole trick. Protect one afternoon. Use it for the work only you can do.
- Average sentence
- 9.1 words
- Shortest to longest
- 1 to 26 words
- Long then short
- 9% of pairs
- One-sentence paragraphs
- 25%
- Contractions
- 6.4 per 100 words
- Questions
- 8% of sentences
- Semicolons
- 9.2 per 1,000 words
- Long dashes
- 0 per 1,000 words
Measure your own writing
Set it up where you already work
- Claude app
- On a Pro, Max, Team or Enterprise plan with code execution on, open Settings, then Features, and upload the ZIP as a custom skill.
- Claude Code or Codex
- Unzip it and move the
personal-voicefolder into~/.claude/skills/for Claude Code, or into your Codex skills folder. - Any other chat assistant
- Open the paste-in file from the ZIP and paste it at the start of a chat, or into the assistant's custom instructions.