Also called: style fidelity, voice match
Voice fidelity is how closely generated text reproduces a specific author's measured patterns, evaluated by comparing the output's stylometric features against that author's corpus rather than by asking a reader whether it sounds right.
It is a comparison against your own measurements, which is what makes it checkable.
Quality and fidelity are independent. Output can be excellent prose and low fidelity, which is the ordinary failure of a capable assistant with no information about you. It can also be high fidelity and poor prose, which happens when a profile faithfully reproduces habits the author would rather drop.
Because fidelity is defined against a measurement, it can be reported per dimension. That is more useful than a single score: knowing that sentence rhythm matches but hedging is far too heavy tells you what to change, where a composite number does not.
| Dimension | Mismatch reads as |
|---|---|
| Sentence complexity | Sentences too even, or subordinated past your habit |
| Vocabulary richness | Reaching for words you do not use |
| Expressiveness | More or less emphatic than you would be |
| Formality | Correct content at the wrong distance from the reader |
| Consistency | Register drifting within one document |
| Conciseness | Padding, or clipped past the point of warmth |
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MyWritingTwin. “Voice fidelity.” Last updated 2026-09-15. https://www.mywritingtwin.com/glossary/voice-fidelity