What is the best AI tool for writing business emails
ChatGPT and Google Gemini are the most capable general-purpose AI tools for writing business emails — describe what you need and get a polished draft in seconds. For Gmail users, Gemini's built-in 'Help me write' button is the lowest-friction option since it lives inside the compose window. Sales teams sending high volumes of outreach will get more mileage from a dedicated tool like Lavender or Copy.ai, which add tone controls and deliverability coaching.
Most AI email tools work on the same basic mechanic: you describe the email you need ('follow-up to a prospect who went cold for three weeks, keep it short') and the model returns a draft you edit and send. The quality gap between tools has narrowed, so the right pick mostly comes down to where you already work — your email client, your stack, your budget. For Gmail users, the Gemini integration is the fastest path. The 'Help me write' button appears directly in the compose window, which cuts out the copy-paste round trip of switching to a separate tab. Outlook users have Microsoft Copilot wired in the same way. If your company already pays for Google Workspace or Microsoft 365, both are included at no additional per-seat cost — which makes them the obvious starting point before paying for anything else. ChatGPT (GPT-4o) handles nuance and tone better than most alternatives. It can match formal or casual register on request, adapt to industry jargon, and manage longer, more complex emails like proposals or vendor negotiations. The free tier is functional; the $20/month Plus plan removes rate limits and unlocks the stronger model. For sales teams specifically, Lavender layers real-time coaching and inbox placement signals on top of AI drafting — features that general-purpose models don't offer. One thing to build into your workflow: AI drafts need a human pass before sending. Models occasionally invent details, flatten tone, or produce sentences that are technically correct but don't sound like you. Thirty seconds of review is enough — and even with that, the time savings over writing from scratch are significant.