ToneSync

Learns your writing voice, flags real-time drift in Gmail & LinkedIn, and rewrites in one click to sound authentically like you.

ToneSync — AI Writing Voice Monitor ToneSync learns your personal or brand writing voice from samples you provide — emails, LinkedIn posts, Slack messages, newsletter drafts — and then monitors your writing in Gmail and LinkedIn in real time. When your writing drifts from your established voice, ToneSync flags it instantly with a color-coded indicator: 🟢 Green — Strong voice match 🟡 Yellow — Mild drift detected 🔴 Red — Significant drift detected One click rewrites your text to sound like you — not like a generic AI tool. Key Features Voice Training — Paste a writing sample (100–500 words) and ToneSync builds a fingerprint of your tone, sentence structure, vocabulary, humor level, directness, and writing traits Real-Time Drift Detection — A floating indicator appears as you compose in Gmail or LinkedIn, updating automatically as you write One-Click Rewrite — Rewrites your full message or just a selected passage to match your trained voice, preserving all meaning Voice Fingerprint Editor — Fine-tune your voice model manually in Settings Rewrite History — Review your last 50 rewrites side by side with the originals Monthly Usage Tracker — Tracks rewrites used with a visual progress bar, resets on the 1st of each month Privacy First Your data never leaves your device except to go directly to Anthropic's Claude API for processing. No external servers. No analytics. No tracking. Your API key, voice fingerprint, and rewrite history are all stored locally in your browser using Chrome's built-in storage. Requirements ToneSync uses Anthropic's Claude API. You'll need a free API key from console.anthropic.com to get started.