Paste 3-5 paragraphs of your writing. Get a tone profile, reading level, sentence rhythm, and a vocabulary fingerprint you can use to brief a writer — or an AI.
The words you use most often — these are part of your voice fingerprint.
Heist's 10-layer Brain stores your voice profile, audience, and examples permanently, then applies them to every post it generates. Never re-explain your voice again.
Start Free Trial →It runs entirely in your browser. The tool counts words and sentences, calculates the Flesch Reading Ease score, estimates formality based on word choice patterns, and extracts your most-used meaningful words. No data leaves your device.
3-5 paragraphs (300-800 words) gives the most reliable profile. Less than 150 words will be noisy; more than 2000 is fine but overkill.
Copy the summary and tags into a brand voice document. Paste that into any AI tool at the start of a prompt, or — if you're using Heist — save it to your Brain so every generation uses it automatically.