8 Best AI Writing Tools for Email Writing in 2026: Tools Compared

ChatGPT is the fastest email drafting tool in this list. It turns a few bullet points into a reply, writes follow-ups and cold emails in different tones, and the free plan covers unlimited everyday text chats, so you can draft all day without paying. Custom GPTs can store your email style and common replies, which keeps the output closer to your voice on every new message.

The catch is the meter on everything around the chat. Free users get 3 file uploads a day, limited image generation, limited voice and limited deep research, and OpenAI does not publish exact caps for most of them. Plus at $20 a month raises those limits but does not remove them, and there is no annual discount.

Claude is the email pick when the message goes to a client. It writes proposals, apologies and follow-ups in a natural tone, holds context across a long thread, and edits cleanly when you ask it to shorten a draft. Projects keep one client's emails, briefs and notes together, so a reply stays consistent with everything you have already told that client.

The catch is the usage meter. Free usage resets on a rolling five-hour window, and even Pro carries a weekly cap, so a heavy day can stop mid-session. There is no native image generation, and the most capable models sit behind paid plans. Max starts at $100 a month for people who write with Claude all day.

Gemini is the email pick for Gmail users. It drafts replies and campaigns inside Gmail and Docs on paid plans, summarises long threads, and Google AI Plus at $4.99 a month is the cheapest paid step in this list. The free plan covers drafting too, with image generation and Deep Research included, which suits a small team already on Google Workspace.

The catch is the unpublished meter. Google says Plus doubles free usage and Pro quadruples it, but it does not publish the base number, so you cannot plan around a fixed message count. The free plan now runs on the lighter Flash-Lite model, and the strongest models need Pro at $19.99 a month.

Grammarly is the email editor in this list, not a draft generator. The free plan checks spelling, grammar and punctuation, detects tone and includes 100 AI prompts a month, so you can see whether a reply sounds firm, friendly or cold before you send it. It runs in Gmail, Outlook and the browser, and Pro at $12 a member a month billed annually adds rewrites and 2,000 prompts.

The catch is the billing gap. Pro costs $12 a member a month billed annually, or $144 a year up front, but $30 a month if you pay month to month, so a year costs $360 that way. The free plan covers the core grammar checks well, and Pro mainly buys rewrites, tone control and a much larger prompt allowance.

Jasper is the email pick for marketing teams that send campaigns at volume. Two Brand Voices on Pro and five Knowledge assets keep every email sounding like the same company, and the Canvas workspace lets a team draft and edit a campaign together. The price is the issue: Pro costs $59 per seat a month billed annually, so it only pays off when several people write emails every day.

The catch is the price and the seat model. Pro costs $59 per seat a month billed annually, or $69 month to month, and each seat is billed separately, so a five-person team pays $295 a month on annual billing. There is no free plan, only a 7-day trial, and the Business plan locks you into 12 months.

Copy.ai fits sales teams that write emails all day. Chat at $24 a month billed annually covers five seats with unlimited words and access to models from OpenAI, Anthropic and Google, so a small team can draft outreach, follow-ups and replies in one place. Workflows on higher tiers connect those emails to prospecting, enrichment and CRM data, which suits a sales-led team.

The catch is the gap between Chat and the real product. Chat at $24 a month billed annually is a fair deal for five seats, but the workflow engine Copy.ai now builds around starts at $1,000 a month billed annually. The old free plan was sunset, and the trial length is not stated on the pricing page.

Rytr is the budget email pick for short messages. The free plan gives 10,000 characters a month across 40+ use cases and 30+ languages, with tone presets that suit follow-ups, cold emails and replies. Lite at $9 a month removes the character cap, and the Chrome extension works inside email and chat, so you can draft without leaving the inbox.

The catch is length. Ten thousand free characters a month is roughly one short post, and even Lite with unlimited characters stays a short-form tool. Long articles need heavy editing and stitching, and the newer Engage features around follow-ups will not matter if you only want a writer.

Anyword is the email pick for campaigns that must convert. It scores subject lines and email variants before you send, so you can shortlist the strongest version without testing every variant on your list. Starter at $39 a month billed annually includes 50 performance predictions a month, which suits a marketer testing many subject lines each week.

The catch is the trial and the upsell. The 7-day trial is capped at 2,500 words, which is barely one campaign test, and the deeper data features such as custom models and data uploads sit on Business and Enterprise plans with custom pricing. Starter gives 50 performance predictions a month, so heavy testers will outgrow it fast.