AI detection · free to try

Was this written by a person, or by a model?

Paste any text and p3n shows how likely it is to be AI-generated, and which sentences give it away. No account needed.

→Sentence-level evidence, not just a percentage
→The same detector via API, priced per call
→Open-source skill you can run yourself

Then fix it

Editorial

An editor for AI-assisted writing: cuts the slop, restores the voice, knows your domain. Work with it turn by turn: “tighter”, “keep the second paragraph”, “more formal for a grant reviewer”.

Editorial

Both passes together, tuned to your domain: legal, academic, marketing, engineering.

Learn more →

Part of Editorial

Deslop

Makes text mean something: removes filler, vague claims and padding.

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Part of Editorial

Humanize

Makes text stop reading as AI-generated.

Learn more →

One API key for every skill

Sign up and get $10 of credit. Pay as you go after that: no subscription, top up when you need to. Every skill is also open source on GitHub.

Get an API key Read the docs GitHub

# Is it AI?
curl https://api.p3n.si/v1/detect \
  -H "Authorization: Bearer $P3N_KEY" \
  -d text="In today's fast-paced world, it's worth noting…"

# {"score": 0.82, "verdict": "likely_ai", "flagged": [...]}