7 Best AI Email Writers
Ranked #7 to #1

Gmail Smart Compose is Google's built-in sentence completion feature for Gmail. As you type, it suggests how to complete the current sentence in grey text, press Tab to accept. It's useful for completing formulaic phrases ('I hope this email finds you,' 'Let me know if,' 'Please feel free to'). It's not drafting. It's autocomplete with slightly more AI than a keyboard. Smart Compose completes your sentences. It doesn't draft your emails. It has no understanding of the email thread you're replying to, learns your writing patterns only superficially, and provides no meaningful help on emails that require actual thought. For short replies with familiar phrases it saves a few seconds. For any real email composition challenge, it's irrelevant.

Grammarly is a writing assistant focused on grammar, clarity, tone, and style. GrammarlyGO (its generative AI feature) can draft emails, rewrite passages, adjust tone, and respond to prompts. Where Grammarly excels is the quality layer on top of your own writing. It makes you a better writer, catches errors, and improves professional tone. Grammarly is a general writing quality tool, not an email-specific writer. It doesn't read your email threads to draft context-aware replies. Its AI drafting requires you to describe what you want. Voice learning is minimal. It improves grammar but doesn't learn your communication style. It belongs in your stack but doesn't eliminate email composition time the way dedicated email AI does.

Lavender is an AI email writing tool built specifically for sales: cold outreach, follow-up sequences, and LinkedIn messages. It scores your email's effectiveness in real time as you write, suggests improvements, generates AI drafts from brief prompts, and analyzes what high-performing emails have in common to help you write more effective cold emails. Lavender is excellent for its specific use case of sales cold email. But it's entirely focused on outbound sales writing. It doesn't handle general professional email composition, doesn't read existing threads for context-aware replies, and is expensive for non-sales professionals.

Copy.ai is a general-purpose AI writing platform with strong email templates: cold emails, follow-up sequences, newsletters, and promotional emails. You describe what you want, it generates options. Multiple tones, formats, and variations. Strong for marketing and sales teams generating email content at scale; less suited for individual professionals managing relationship-driven email threads. Copy.ai generates from templates and prompts. It doesn't read your existing email threads to write context-aware replies. For marketing content creation it's strong. For professional relationship email (the kind most executives and consultants send), it can't generate a useful reply without significant manual context input. It's a content tool, not an email management tool.

Superhuman is a premium email client with an AI writing assistant that has a significant advantage over standalone tools: it lives inside your email. It learns from your actual sent emails to write in your style, understands the thread context when you ask it to draft, and produces drafts that are closer to your voice than tools that operate outside the email environment. Superhuman's AI writing is context-aware and voice-learning in ways that standalone tools can't match. But it still requires you to initiate. You open the email, you ask for the draft. There's no autonomous drafting happening before you open the email. And at $30/month with Gmail-only breadth, it's a significant commitment for writing assistance alone.

Shortwave is an AI-native Gmail client with a genuinely strong AI compose feature. Draft full replies from a one-line prompt, with the email thread automatically loaded as context. The AI knows what you're replying to. It's not generating a generic email, it's responding to the specific thread. At $7/month Personal, it delivers context-aware AI drafting at a fraction of Superhuman's price, making it arguably the best value AI email writer in this category. Shortwave's context-aware drafting is genuinely competitive with Superhuman at a much lower price. Its limitations: Gmail-only, manual initiation required (you prompt it to draft, it doesn't draft autonomously), and no inbox triage or task extraction. It's the best on-demand AI email writer in its price range, but you're still doing the initiating.