Free writing tools

Measure your own writing, check an AI draft, compare two voices, or give the AI you use a measured target. All 18 tools are free and 17 need no account; each one below says which.

Measure your writing

• Writing style analysis: Paste your writing and get a measured breakdown of your style: sentence rhythm, vocabulary diversity, punctuation habits and function-word patterns. Free, no signup, runs in your browser. No account needed.
• LinkedIn writing style analyzer: Paste three or more LinkedIn posts and get a free stylometric habits report: sentence rhythm, contractions, punctuation, openers and the AI tells, against 299 public pieces. In your browser, nothing stored. For your own posts or with permission. No account needed.
• Micro-habit detection: Word choice is the smallest part of a writing voice. The habits that identify you are contraction rate, sentence variation, asides, how you open. Measure twelve of yours against a reference corpus, free. No account needed.
• Style guide generator: Paste your own writing and get a free one-page style guide built from counted measurements: sentences, paragraphs, punctuation, contractions, openers and AI tells, each with a rule. Runs in your browser. The full profile measures 45 attributes. No account needed.

Check an AI draft

• AI cliché checker: Paste a draft and count the AI clichés and sentence shapes detectors score: generic transitions, nominalised metaphors, not-X-but-Y, triadic lists, uniform sentence length. Free, in your browser, with the full list published. No account needed.
• AI slop checker: Paste any passage and count the AI slop: 30 listed phrases and 10 sentence shapes per 1,000 words, plus em dashes, uniform sentence length, missing short sentences and missing contractions. In your browser, against 299 human pieces. No rewriting, no signup. No account needed.
• Free AI-writing detector: Paste any text and get an indicative, stylometric human-vs-AI reading, with the signals that give AI writing away. Free with a ScriptGrain account. Needs a free account.

Compare voices

• Brand voice consistency checker: Consistency you can score: a measured 45-attribute baseline, then a voice-match score on every draft so drift is a number, not a feeling. No account needed.
• Brand voice analyzer: Paste or link the piece that is the brand at its best, then up to three pages or drafts, and see a voice-match score for each with the exact attributes that moved. No signup, nothing stored; the full method is published. No account needed.
• Brand voice generator: Generate a measured reading of your brand voice from the page that is your brand at its best, then score up to three other pages against it and see the attributes that moved. Free, no signup. The full profile measures 45 attributes. No account needed.
• Multi-client voice drift check: Paste a client's approved reference piece and up to three recent pieces (a new writer's draft, this month's posts) and see whether the voice has drifted, with the habits that moved. No signup, nothing stored. Built for agencies and ghostwriters. No account needed.
• AI style mimic: Free AI style mimic check: paste the style you were aiming at and up to three attempts, and see which of the measured habits transferred and which did not. No signup, nothing stored. No account needed.

Make your AI sound like you

• AI style rewriter: Free AI style rewriter workflow: measure the voice you want from a sample, get a rewrite prompt written in numbers for ChatGPT, Claude or Gemini, then score the rewrite. The paid version rewrites against a full profile and scores every pass. No account needed.
• Tone of voice generator: Paste your own writing and get a free one-page tone of voice prompt written in numbers (sentence length, contractions, punctuation, register) for ChatGPT, Claude or any assistant. The full profile measures 45 attributes and scores every draft. No account needed.
• Works with ChatGPT: Connect ScriptGrain to ChatGPT: a measured 45-attribute profile of your voice, a score on every draft, and a polish toward the target. ChatGPT keeps doing what it does; it just sounds like you. No account needed.
• Works with Claude: Connect ScriptGrain to Claude: a measured 45-attribute profile of your voice, a score on every draft, and a polish toward the target. Claude keeps doing what it does; it just sounds like you. No account needed.
• Works with Gemini: Make Gemini write in your voice two ways: a measured one-page prompt for a Gem, or the full profile over MCP in Gemini CLI, with a voice-match score on every draft. The profile, the connector and scoring are free. No account needed.
• Learning from your edits: Every edit you make to an AI draft says something about your voice. ScriptGrain reads the difference between the draft and what you published and proposes changes to the profile. See the loop on a draft of your own. No account needed.

Each tool measures part of a voice. A free ScriptGrain profile measures all 45 reference points from your own writing. See how it works.