ToneSync

Tracking since May 2, 2026.

Changelog

• May 8, 2026
  description

  ToneSync is an AI-powered Chrome extension that learns your personal or brand writing voice from samples you upload — emails, LinkedIn posts, Slack messages, newsletter drafts — and then monitors every text field you write in across the web. When your writing drifts from your established voice, ToneSync flags it in real time
  and offers a one-click rewrite that sounds like you, not like a generic AI tool.

  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.

• May 8, 2026
  short_description

  Learn your personal writing voice and get alerted when you drift — with one-click AI rewrites.

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

Permissions & access

Permissions

storage

Host access

https://api.anthropic.com/*, https://mail.google.com/*, https://www.linkedin.com/*

Screenshots