Letterbot AI

AI email assistant — generate emails, replies, subject lines, summaries, and grammar fixes in 13 languages.

Write better emails in seconds. Letterbot AI lives inside your Gmail compose window — just click the robot icon in the toolbar and let AI do the writing. 6 Powerful Tools: 📧 Write Email — Describe what you want to say, and AI writes the full email for you ↩️ Smart Reply — Paste an incoming email and describe your intent. AI drafts a contextual reply 💡 Subject Line Generator — Get 3 subject line suggestions for any email 📋 Email Summary — Condense long emails into concise bullet points ✏️ Grammar Correction — Fix spelling, grammar, and punctuation mistakes instantly 📈 Sales Email — Generate persuasive cold outreach and sales pitches 13 Languages: English, German, Spanish, French, Portuguese, Croatian, Japanese, Korean, Chinese (Simplified & Traditional), Arabic, Hindi, and Russian. 5 Writing Tones: Formal, Casual, Friendly, Polite, or Respectful — match the right tone for every situation. Works Inside Gmail: No switching tabs. Letterbot adds a button directly to your Gmail compose toolbar. Click it, pick a tool, type your prompt, and generate. Hit "Insert" to paste the result straight into your email. Template Library: Don't know where to start? Choose from ready-made templates: follow-up after no reply, meeting request, thank-you after interview, polite complaint, project status update, resignation notice, and more. Smart Reply Context: When replying to an email, Letterbot automatically extracts the conversation thread so the AI knows what you're responding to. Pricing: • Free — 5 requests per day • Basic — 100 requests per day • Professional — 800 requests per day Get started for free. Upgrade anytime at letterbot.ai.