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Fix AI writing so it sounds human.

Paste AI drafts, rewrite them naturally, and deliver content clients won't question.Free tier, no card required.

Your draft

Naturally yours

Your humanized text will appear here, natural, clear, and ready to deliver.

1,500
Free words on signup
No card required
<3s
Per rewrite
Re-scores are instant
0-100
Human score on every output
See what is working

Built for creators

For people who write, not people who hack detectors.

You used AI to move faster on the draft. Now you want it to sound like you wrote it. One clean rewrite and back to publishing.

Newsletter writers

SubstackBeehiivConvertKit
AIIn today's evolving content landscape...
YouI rewrote our pricing last Tuesday. Here is what broke.

Podcasters

Show notesScriptsSummaries
AIJoin us as we dive into this fascinating episode...
YouShe fired three of her first ten customers in month two.

Solopreneurs

LinkedInCold emailLanding copy
AIFurthermore, leveraging synergies can unlock value.
YouWe canceled the offer on Friday. Best call we made.

Bloggers & YouTubers

Long-formVideo scriptVoiceover
AIIt is important to note that there are many factors...
YouThree things broke when we hit 10k subs. This is one.

Watch your writing improve.

Each edit, each re-score brings you closer to content your clients won't question.

AI humanizes

62

First draft - still sounds like ChatGPT

You edit + re-score

78

AI patterns removed, sounds natural

Fork + humanize

91

Client-ready - passes any detector

Re-scoring is free. Iterate as many times as you want.

How it works

1

Paste your AI draft

Drop in any ChatGPT, Claude, or Gemini draft. One click to humanize.

2

AI humanizes it

Get a humanized version with a quality score (0-100). Good starting point, not the finish line.

3

Edit & re-score

Tweak sentences, hit Re-score. See the number climb. Free, unlimited, instant feedback.

4

Fork & compare

Branch into alternatives. Compare versions side by side. Pick the one that sounds most like you.

What you ship

Paste the AI draft. Ship the human version.

No prompt engineering, no chasing a number. Just clean output, ready for whatever you publish next.

Most common

Weekly newsletter issue

Substack, Beehiiv, ConvertKit. Voice-first content where subscribers notice the second your cadence shifts.

"In today's evolving creator economy, monetization has become..."
"I doubled the paid tier price on Sunday. Half the list ignored it. The other half upgraded."

Podcast show notes

Highlight bullets with real quotes, not paraphrased summaries.

LinkedIn post

No more colon hooks.

YouTube script

Talking-head or voiceover.

X / Twitter thread

Written, not generated.

Blog post

WordPress, Ghost, Notion.

Cold email & landing copy

Outreach that does not read as outreach. Hero, features, FAQ.

Episode & interview script

Spoken cadence with the commas you can actually pause on.

Your readers do not run detectors. They notice rhythm, voice, and the small turns of phrase a person would actually use.

A workshop, not a slot machine.

Most humanizers give you one shot and hope for the best. Metric37 gives you a scoring loop so you can keep going until the writing is actually good.

Free unlimited re-scoring

Edit a sentence, re-score instantly. No cost, no limits. You see the number change and know what is working.

Version tree

Branch, compare, and navigate a tree of revisions. Each node has a score. See which edits improved the text.

Fork alternatives

Try a different direction from any version. Compare branches side by side. Pick the winner.

Word-level diff

See exactly what changed between any two versions. Word by word, no guessing.

API for your pipeline

One REST endpoint, API key auth. Send text, get back the rewrite. Fits anywhere.

Under 3 seconds

Fast enough to stay in your flow. Re-scores return in milliseconds.

Pay for words, not gimmicks.

Buy a word pack, use it whenever you need. No subscription required.

Micro
$2
3,000 words
  • One-time payment
  • Never expires
Get Started
Small
$4
10,000 words
  • One-time payment
  • Never expires
Get Started
Best Value
Medium
$12
50,000 words
  • One-time payment
  • Never expires
Get Started
Large
$39
200,000 words
  • One-time payment
  • Never expires
Get Started

Introductory pricing. Won't stay this low.

Free

1,500 words to try it out. No card needed.

1,500 words on signup
Unlimited refinements
Start Free
ENTERPRISE
Custom

For teams and agencies scaling content

2,000,000 words/moSSO (SAML/OIDC)Unlimited team membersDedicated support + SLAPriority API (200 req/hr)Custom processing profiles
Contact sales

Monthly Plans

For power users who need words every month.

Founding Member Pricing - 30% off for life for our first 100 subscribers

MonthlyAnnual

Why we built this

Built because we needed it

We were using AI to draft client work. The drafts were fast but sounded like every other AI output on the internet. Clients noticed. Detectors flagged it. We tried paraphrasers, synonym swappers, prompt tricks. Nothing worked well enough.

So we built Metric37. Rewriting with a scoring loop, so you can actually see your text improve. It is the tool we wanted to exist.

Stop delivering AI drafts.
Deliver real writing.

1,500 words free. No credit card. Paste something and see.

Start Free - No Card Needed