Check copy against your own voice rules and list each line that breaks one, with a replacement.

Brand voiceFreeFor writers, brand teams and agencies

30/day

free runs a day, no sign-in.

Before: what you give it

The example input, as typed in. You paste text, CSS, markup or notes.

text:
  # Welcome To Your Dashboard
  Log in to see your acme cloud projects! It is a really amazing, game-changing tool—built for teams.
  You can login anytime to deskpad and invite your team; we then synchronise everything across all of the devices that you own and every browser that you have signed in to.
  
rules:
  use 'sign in' not 'log in' or 'login'
  never use the words amazing, game-changing
  no exclamation marks
  no em-dashes
  product names: Acme Cloud, DeskPad
  headings in sentence case
  max sentence length 20 words
  must include 'free plan'
  tone to avoid: salesy

After: what comes back

The first lines of a real run on that input. Nothing here is edited by hand.

How the rules were read (correct any that are wrong):
  1. use "sign in" instead of "log in"   [from: use 'sign in' not 'log in' or 'login']
  2. use "sign in" instead of "login"   [from: use 'sign in' not 'log in' or 'login']
  3. never use "amazing"   [from: never use the words amazing, game-changing]
  4. never use "game-changing"   [from: never use the words amazing, game-changing]
  5. no exclamation   [from: no exclamation marks]
  6. no emdash   [from: no em-dashes]
  7. write "Acme Cloud" exactly like that   [from: product names: Acme Cloud, DeskPad]
  8. write "DeskPad" exactly like that   [from: product names: Acme Cloud, DeskPad]
  9. headings in sentence case
  10. sentences of at most 20 words   [from: max sentence length 20 words]
  11. text must include "free plan"   [from: must include 'free plan']
  12. avoid tone word "amazing"   [from: tone to avoid: salesy]
  13. avoid tone word "incredible"   [from: tone to avoid: salesy]
... full output on the tool page

What you get

Violations with line number, offending text, the rule and a suggestion, plus rules that never matched

What it cannot do

Enforces the rules you give it, parsed forgivingly and echoed back; it has no judgement about tone beyond words you list.

Who it is for

Writers
Brand teams
Agencies

Free and Pro

Free	30 runs a day per IP address, up to 50,000 characters a run.
Pro	No daily limit, 300 requests a minute, up to 200,000 characters a run.

What each plan includes

Use it from your assistant

The tool is called lint_brand_voice. Connect the server once, then ask for it by name or just describe the job. Install steps for each app.

claude mcp add --transport http designers https://designers.allthepossibles.com/mcp

curl -X POST https://designers.allthepossibles.com/api/brand-voice-lint -H 'content-type: application/json' -d '{"text":"# Welcome To Your Dashboard\nLog in to see your acme cloud projects! It is a really amazing, game-changing tool—built for teams.\nYou can login anytime to deskpad and invite your team; we then synchronise everything across all of the devices that you own and every browser that you have signed in to.\n","rules":"use '\''sign in'\'' not '\''log in'\'' or '\''login'\''\nnever use the words amazing, game-changing\nno exclamation marks\nno em-dashes\nproduct names: Acme Cloud, DeskPad\nheadings in sentence case\nmax sentence length 20 words\nmust include '\''free plan'\''\ntone to avoid: salesy"}'

Try it here

The form starts with the same example input, so you can run it first and then swap in your own.

Copy to check; # marks a headingOne rule per line, or JSON