A free tool
Voice Fingerprint
Paste the same character from two different points in the book and see how their style holds up: sentence rhythm, vocabulary, contractions, dialogue. It reads the surface of the voice and tells you where it has drifted.
Both passages are compared entirely in your browser. Nothing is uploaded, stored, or sent to any AI.
Drift is not always a problem.
A character should not sound identical in chapter two and chapter forty. They have been through the book. Their sentences might tighten under pressure, or loosen as they finally relax. Some drift is the character living.
What this tool catches is the drift you did not intend: the scene where a guarded, clipped narrator suddenly turns expansive and ornate because you wrote it three months later in a different mood. When several signals diverge at once, read those two passages back to back and decide on purpose.
- What does the voice consistency checker measure?
- It compares two passages on measurable style signals: average sentence length, sentence rhythm, vocabulary richness, average word length, contraction rate, and dialogue share. It does not judge meaning. It shows you where a character's style has drifted so you can decide whether that drift is intentional.
- Can a tool really check character voice?
- Not the soul of it, no. But voice has a measurable surface: how long the sentences run, how often the character uses contractions, how dense the dialogue is. When those signals shift sharply between two scenes of the same character, it is worth a second read. That is what this tool surfaces.
- Is it free, and does my text get uploaded?
- It is free with no sign-up, and nothing is uploaded. The entire comparison runs in your browser. Your text is never sent to a server, stored, or used to train any model. There is no AI call involved.
- How is this different from DraftProse itself?
- This tool compares two passages you paste. DraftProse, the full writing studio, can run a character-voice read across every scene a character appears in, grounded only in your own manuscript, and like this tool it never generates prose. The workspace is free; the Reader is the paid part.