ToneShift — AI Writing Assistant

Rewrite and generate AI-powered replies in any tone — directly in Gmail, LinkedIn, and Twitter/X.

✨ ToneShift — AI Writing Assistant Struggling to strike the right tone in your emails, tweets, or LinkedIn posts? ToneShift brings AI-powered writing assistance directly into your favorite platforms — no copy-pasting, no switching tabs. ── HOW IT WORKS ── 1. Start typing in Gmail, Twitter/X, or LinkedIn 2. The ToneShift button (✨) appears near your text field 3. Choose a tone: Professional, Casual, Friendly, Assertive, or Concise 4. Hit "Rewrite" — your text is instantly rewritten in the chosen tone 5. Like a suggestion? Click "Use this" to apply it ── FEATURES ── 🎯 Tone Rewriting Rewrite any text in 5 built-in tones: • Professional — polished and business-ready • Casual — relaxed and conversational • Friendly — warm and approachable • Assertive — confident and direct • Concise — short and to the point 💬 Reply Generator (Pro) Replying to an email or tweet? Generate 3 ready-to-send reply options based on the message you're responding to. 🌍 Multilingual Support ToneShift detects the language of your input and responds in the same language. Write in Japanese, Spanish, French, or any language — and get rewrites in that same language. 🔒 Privacy First Your Anthropic API key is stored locally on your device only. ToneShift never sees your text — it goes directly from your browser to Anthropic's API. ── SUPPORTED SITES ── • Gmail (mail.google.com) • Twitter / X (twitter.com, x.com) • LinkedIn (linkedin.com) ── FREE vs PRO ── Free: • Tone rewriting — 10 rewrites/day • 5 built-in tones • Works on all 3 supported sites Pro ($7/month): • Unlimited rewrites • Reply generation (3 options per click) • Up to 5 custom tones • Priority support ── SETUP ── 1. Install ToneShift 2. Get a free API key at console.anthropic.com 3. Open ToneShift Settings and enter your API key 4. Start writing on Gmail, Twitter/X, or LinkedIn ── YOUR API KEY ── ToneShift uses your own Anthropic API key, giving you full control over usage and costs. Claude Haiku (the model used) is extremely affordable — typical usage costs less than $1/month. Questions? Contact us at m.masaki.sm@gmail.com