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Saylikeby Unplain

Free brand voice skill generator

Make AI write like your brand.

Turn your website and writing samples into a reusable copywriting skill for Claude, ChatGPT and other AI assistants.

PDF, DOCX, TXT, Markdown or screenshots. Up to 3 files, 5 MB each.

Free, no sign-up. Your files are read in memory and never stored by Saylike.

One analysis, three ways to use it

For Claude, Codex, Cursor and more

A skill file for agents

In the open Agent Skills format. Loads in Claude, Claude Code, OpenAI Codex, Cursor, GitHub Copilot and other tools that read skills.

For people and any assistant

A brand voice guide

One Markdown file with every rule and annotated examples. For people, and for any assistant that takes instructions.

For ChatGPT and other chat assistants

Paste-in instructions

Two sizes for ChatGPT custom instructions and Projects: one that fits every plan, one with the full detail.

Specific enough to sound like you

A good voice skill reads like notes from an editor who studied your writing, not a list of adjectives. This is part of the skill Saylike generated from unplain.io, unedited.

  • Traits as behaviour. What to do in a sentence, not how to feel.
  • Measured rules. Numbers from your writing, so assistants can hold to them.
  • Quotes as proof. Every one checked against the source.
unplain-brand-voice/SKILL.mdexcerpt

Unplain brand voice

The voice is direct and practical, built on short declaratives and blunt contrasts (“Unplain does not write a word”, “PDF only, on purpose”). It is confident about its own limits and admits where other tools win, which sets it apart from the hype common in SaaS copy. The designer's first-person note adds a human, slightly self-deprecating register.

Voice traits

Plain-spoken, never fluffy

Says what the thing does in short, concrete sentences with no marketing filler.

  • Do: State the outcome first, then the mechanism
  • Do: Use short declarative sentences
  • Do: Name the concrete object (cover, contents, page numbers)
  • Don't: Use words like seamless, elevate or unlock
  • Don't: Open with a benefit adjective instead of a fact
  • Sounds like: “Unplain does not write a word, so you never pay for AI twice.” / “Markdown describes structure: this is a heading, this is a list, this is a table.”

Confident about limits

Names what the product does not do and recommends competitors when they fit better.

  • Do: Say plainly what is excluded (PDF only, no rewriting)
  • Do: Recommend an alternative when it is the better fit
  • Don't: Hide limitations in fine print
  • Don't: Claim the product fits every case
  • Sounds like: “Pandoc is the serious answer, and it is free.” / “Yes, if you are making one PDF once and can live with inconsistencies.”

Generic versus on-brand

What a generic assistant would write, then what Unplain actually wrote. Aim for the second.

  • Generic: “Our intelligent platform empowers you to seamlessly transform your content while preserving your unique voice.” Unplain: “Unplain never rewrites what you wrote.”
  • Generic: “Markdown files lack design information, which can make it challenging to maintain consistent branding.” Unplain: “Nothing in the file says what your typeface is.”
  • Generic: “While AI generators offer speed, they may compromise the authenticity of your original message.” Unplain: “Fast, but no longer your words”
  • Generic: “We created Unplain to empower creators by simplifying the document design process.” Unplain: “I built Unplain because I was very, very tired of designing lead magnets and ebooks.”

Writing mechanics

Measured in the source writing

  • Median sentence: 10 words. 42% of sentences have 8 words or fewer; 11% have 25 or more.
  • No exclamation marks (none in 5,223 words).
  • No emoji.
  • No dashes as punctuation: use commas, colons or full stops.
  • Talk to the reader: “you/your” appears 35.2 times per 1,000 words, “we/our” 0.6.
  • Avoid contractions: write it is, you will, do not.
  • Headings in sentence case (only the first word and names capitalised).
  • Headings often end with a full stop.
  • Button labels seen: “Create a PDF”, “Start creating”, “Upgrade to Pro”, “Get the Creator Pack”, “How the MCP works”, “All guides”.
Generated from unplain.io. Nothing edited.

How Saylike builds a skill

The full method
  1. 01

    Read

    Up to five pages that carry the most voice: home, about, product and a couple of articles. Your samples count first.

  2. 02

    Measure

    Sentence length, punctuation habits, heading case, how often you say you and we. Counted in code, not guessed.

  3. 03

    Analyse

    An AI model turns the writing into traits, rules, vocabulary and copy patterns, each tied to quotes from your pages.

  4. 04

    Check

    Every quote is matched word for word against your writing. Anything that doesn't match is removed, with the claims that leaned on it.

Why not just ask ChatGPT to describe my voice?

You can, and you'll get a description: confident, friendly, clear. Every brand is confident, friendly and clear. An assistant can't do much with that.

Saylike gives the assistant instructions it can follow. Rules carry numbers measured from your pages. Vocabulary comes from words you actually use. Quotes are checked word for word, and anything the model made up is removed. Rules that are recommendations rather than observations are marked as such. And the result comes in the formats each assistant actually loads, so you set it up once instead of pasting a prompt into every chat.

Where your skill works

Where to install or paste each export
AssistantHow
Claude (web and desktop)Upload the skill .zip under Customize, Skills
Claude CodeUnzip into ~/.claude/skills/ or your project's .claude/skills/
OpenAI CodexUnzip into ~/.agents/skills/ or your repo's .agents/skills/
Cursor, GitHub Copilot, VS Code, Gemini CLIAdd the skill folder where the tool reads Agent Skills
ChatGPTPaste the short or full instructions into custom instructions or a Project
Gemini, Microsoft Copilot, anything elsePaste or attach the brand voice guide

Step-by-step setup: Claude and ChatGPT.

Questions

Is Saylike free?

Yes. There is no account, no trial and no payment. A per-visitor limit of a few skills an hour keeps the free service running for everyone.

What does Saylike read on my website?

Your homepage plus up to four more pages that usually carry the most voice: about, product or features, and a couple of articles. It skips legal pages, logins, carts and anything your robots.txt asks crawlers to avoid. Navigation, footers and cookie banners are stripped out.

What happens to my writing samples?

They are read in memory to extract the text, sent with your website text to the AI model for analysis, and dropped when the request ends. Nothing is stored on our servers. Your finished skill is kept only in your own browser so you can come back to it.

What is a SKILL.md file?

A Markdown file with a short name and description at the top, in the open Agent Skills format. Assistants that support skills, like Claude, Claude Code and OpenAI Codex, load it when a task matches the description, so your brand voice applies whenever you ask for copy.

Can I use it with ChatGPT?

Yes. Saylike gives you two paste-in versions: a short one under 1,500 characters that fits ChatGPT's custom instructions on every plan, and a full one under 5,000 characters for paid plans and Projects.

How is this different from asking an AI to describe my brand voice?

An AI asked directly gives you a description. Saylike gives you instructions an assistant can follow: rules with measured numbers (like your median sentence length), vocabulary taken from your own pages, quotes checked word for word against your writing, and a clear mark on every rule that is a recommendation rather than an observation.

My site is built with JavaScript and Saylike found no text. What now?

Some sites send an empty page and draw the text in the browser. Add writing samples instead: a blog post, a newsletter, a brochure as PDF or DOCX, or screenshots of your pages. Samples alone are enough to build a skill.

Does it work for websites in other languages?

Yes. The rules are written in English, which every assistant reads well, and the skill tells the assistant to write in your site's language. Quotes and vocabulary stay in the original language.