Best AI Email Writer (2026): Free Generators, Inbox AI, Cold Outreach and Support, Compared

Short answer: to write one email for free, a general chatbot does the job: ChatGPT's Free plan offers unlimited text chats, and Claude and Gemini have free plans too. For a dedicated free generator with no sign-up, Grammarly's AI Email Writer and Smartlead's are free on the web. If you write email every day, put the AI in your inbox: Superhuman's Email Assistant drafts replies in Gmail or Outlook for $12 a month on annual billing, and Gemini in Gmail comes with Google Workspace from $7 a user a month. For cold outreach, Lavender coaches and writes inside Gmail and Outlook with a free tier of 5 emails a month. For a support inbox, Help Scout drafts replies from your past conversations and help docs. Updated November 9, 2026.

How we checked: prices, free limits, supported mailboxes and style-learning claims come from each vendor's own pricing, product or help page, read November 9, 2026. Where a page does not state something, we say "Not stated". We did not test these writers hands-on, so this guide compares published prices, limits and features, not the quality of the emails they write. Prices change often; check the vendor before you pay.

People searching for an AI email generator usually want one of four things, and the right tool is different for each:

• One email, now, for free. A thank-you note, a complaint, a resignation letter. A general chatbot or a free web generator is enough, and you paste the result into your mail app.
• Help with every email, inside the inbox. The AI reads the thread and drafts the reply in your voice, so you edit and press Send. That means connecting your mailbox, which costs money and raises privacy questions. Our AI email assistant comparison covers this group in more depth.
• Sales and cold outreach. Writing many first-touch emails to people who do not know you. The writer is useless if the mail lands in spam, so these tools come bundled with sending and deliverability features.
• Customer support replies. Answering the same questions from customers, using your help docs. A helpdesk with AI drafts, or an AI agent that replies on its own, fits better than a personal assistant.

ChatGPT. Its pricing page lists a Free plan with "unlimited text chats with GPT-6", subject to abuse guardrails, plus limited memory, uploads and image creation. For an email, that is all you need: describe who it is to, what you want, and the tone, then paste the draft into your mail app. The paid plan prices did not show on the page when we read it.

Claude. The Free plan is $0 with "limited usage every 5 hours and every week", on web, desktop and mobile, and includes memory across conversations. Pro is $17 a month on annual billing ($200 up front) or $20 monthly. A weekly cap matters only if you write a lot.

Gemini. Free with a Google Account, on Google's Flash-Lite model. The free plan does not list Gemini in Gmail; that starts with Google AI Plus at $4.99 a month, and Google AI Pro at $19.99 adds Gemini in Docs as well.

Dedicated generators. Grammarly's AI Email Writer is a free web form: add your text, click Create email, then adjust formality, tone and length. It does not state a usage limit. Smartlead's AI Email Writer asks for recipient, subject, tone and purpose, and says "No signup needed, unlimited use"; it is aimed at cold outreach. HubSpot's AI email writer lives inside HubSpot's marketing and sales tools, with free features and no card required, so it suits you only if you already use HubSpot.

Not for: anything you send often. None of these see your inbox, so you re-explain the context every time, and none of them learn how you write unless you paste in examples.

If you answer email all day, a tool that reads the thread and leaves a draft in your Drafts folder saves more time than any generator. Our AI email assistant comparison goes through ten of these on price, Outlook support, auto-send and privacy. The short version:

• Gemini in Gmail is part of Google Workspace: Business Starter is $7 a user a month and lists "Gemini AI assistant in Gmail", with 14 days at no cost. For a personal Gmail account it comes with Google AI Plus at $4.99 a month. It writes when you ask; it does not draft every reply in the background.
• Copilot in Outlook comes with Microsoft 365 Personal, $9.99 a month or $99.99 a year, which includes the Outlook desktop app "with Microsoft Copilot" and a one-month trial. Microsoft's business Copilot pages did not load for us, so business pricing is not stated here.
• Superhuman Email Assistant works inside Gmail or Outlook, drafts a reply to every message that needs one, and learns how you write from your sent mail, adapting per recipient. It is $12 a month on annual billing or $15 monthly, and its FAQ says nothing is sent without your approval.
• Fyxer drafts in Gmail and Outlook from Pro, $37 a person a month on annual billing or $49 monthly, per its pricing page. Its free plan has a daily briefing but no drafted replies.
• Shortwave is a new email app for Gmail only, from $30 a seat a month on its pricing page, with a 14-day trial.
• MailMaestro is the low-cost option for Outlook: a free plan with 3 AI requests a week, then Pro at $12 a seat a month billed annually, per its pricing page.

Not for: anyone uneasy about giving a vendor read access to their whole mailbox. If that is you, stay with a chatbot and paste in only what you choose.

Lavender is an email coach that sits in Gmail and Outlook 365, scores your draft and rewrites it. Its pricing lists a Basic plan, free forever, with 5 analyzed and 5 personalized emails a month and the AI Email Writer; Starter at $27 a month and Individual Pro at $45 a month, both billed annually, with unlimited emails; and a Team plan at $89 a seat a month. There is a 7-day trial with no card. Lavender says it analyzes your historic emails to learn what works for you. It also sells Ora, an agent that researches, writes and sends sales emails.

Instantly is a cold-email sending platform. On its pricing page, the AI Email Writer Agent comes with the Credits plans, from $47 a month for 1,500 credits, which also give access to "5 major LLMs" or your own LLM API key. Sending is a separate Outreach plan from $47 a month (5,000 emails, 1,000 uploaded contacts, unlimited mailboxes and warmup), or both together in a Starter bundle at $94 a month, $85 on annual billing. A free plan is not stated.

lemlist puts AI into a multichannel outreach tool. Its pricing page lists the Email plan at $69 a month, or $55 on yearly billing, with unlimited users and 50,000 emails a month, and Multichannel at $109 ($87 yearly) per user, which adds LinkedIn, SMS and use from Gmail and LinkedIn. Its AI features include lemAgent, messaging agents and AI-generated replies. There is a free trial.

Smartlead is a sending platform with plans from $39 a month ($32 on annual billing) for 2,000 contacts and 6,000 email sends, per its pricing page. Its free AI writer, above, is the useful part if you only want copy.

If you want an AI to find prospects and run the whole sequence rather than write the emails, see our AI SDR tools comparison.

An AI can write a hundred cold emails a minute, and that is exactly how a domain ends up in spam. Gmail and Yahoo publish the rules, and both apply to cold outreach as much as to newsletters.

• Everyone, at any volume. Google's email sender guidelines require SPF or DKIM on your sending domain, valid forward and reverse DNS for your sending IPs, a TLS connection, messages formatted to RFC 5322, and a spam rate reported in Postmaster Tools below 0.3%. Yahoo's sender requirements set the same 0.3% line and the same authentication minimum.
• Bulk senders. Google's stricter rules apply when you send more than 5,000 messages a day to Gmail accounts: SPF and DKIM and DMARC, a From: domain aligned with SPF or DKIM, and one-click unsubscribe for marketing and subscribed messages. Yahoo's bulk rules ask for SPF and DKIM, a DMARC policy of at least p=none that passes, one-click unsubscribe, a visible unsubscribe link, and honoring unsubscribes within 2 days.
• The real target is lower. Google's page advises keeping the spam rate below 0.10% and never reaching 0.30%. Every recipient who clicks "Report spam" on a cold email counts toward that rate, so a well-written email to the wrong list still hurts you.

Authenticity matters for the same reason. An AI-written opener that invents a shared connection, a fake "Re:" subject or praise for a post the person never wrote gets reported. Use AI to tighten your copy and to personalize from facts you actually have, keep the claims true, and make the opt-out easy. Sending platforms like Instantly, lemlist and Smartlead sell warmup and deliverability tools, but none of them can fix a list of people who did not want to hear from you.

If the email is a customer asking where their order is, a helpdesk with AI does better than a personal writer, because it answers from your help docs and order data and keeps a record your team can see.

• Help Scout. Its pricing page lists a Free plan, Standard at $25 a user a month and Plus at $45. AI Drafts, which "draft replies based on past conversations and help content", are unlimited on Plus. AI Answers, sold as the Envoy add-on, answers customers on its own at $0.75 per resolution, with 3 months of free resolutions for new accounts.
• Gorgias. Built for ecommerce. Its pricing page puts an AI Agent on every plan, answering across email, chat, social and the help center with brand voice and guardrails. Starter is $10 a month for 50 helpdesk tickets, or $40 a month with the AI Agent and 30 automated interactions, then $1.50 per extra automated interaction.
• Tidio. Its pricing page shows a free plan, Starter at $24.17 a month for 100 billable conversations, and the Lyro AI agent from $32.50 a month for 50 AI conversations. Every account gets its first 50 Lyro conversations free, for life. Tidio's ticketing turns support emails into tickets, and Lyro answers from your support content.

Not for: your personal inbox. These tools want a shared support address and a knowledge base to answer from.

• You need one good email today: ChatGPT, Claude or Gemini on their free plans, or Grammarly's free AI Email Writer.
• You write a lot of email and live in Gmail: Gemini in Gmail through Workspace or Google AI Plus, or Superhuman Email Assistant for background drafts in your voice.
• You live in Outlook: Copilot with Microsoft 365, MailMaestro at $12 a seat, or Superhuman Email Assistant.
• You write sales emails one by one: Lavender, starting on its free tier.
• You send cold email at volume: Instantly, lemlist or Smartlead, after you set up SPF, DKIM and DMARC.
• You answer customers: Help Scout for a small team, Gorgias for a store, Tidio for a small business that wants chat and email in one place.

Whatever you pick, read the draft before it goes out. Every inbox tool here leaves the final Send to you, and that is the step that keeps a wrong date or an invented detail out of someone else's inbox.

What is the best free AI email generator?

For a one-off email, ChatGPT's Free plan offers unlimited text chats, and Claude and Gemini have free plans too. Grammarly's AI Email Writer and Smartlead's AI Email Writer are free web tools; Smartlead's needs no sign-up. None of these read your inbox, so you paste the result into your mail app.

Can Gmail write emails with AI?

Yes, through Gemini in Gmail. Google lists it in Google Workspace from Business Starter at $7 a user a month, and for personal accounts in Google AI Plus at $4.99 a month. Gemini's free plan does not list Gemini in Gmail.

Which AI email writer learns my writing style?

Superhuman's Email Assistant learns from the emails you have already sent and adapts to each recipient. Fyxer builds a profile of how you write, Shortwave learns from the emails you send, and Lavender analyzes your past emails. General chatbots only match your style if you give them examples.

Is there a free AI email reply generator?

For personal email, paste the message into a free chatbot such as ChatGPT, Claude or Gemini and ask for a reply. Inbox tools that draft replies automatically are paid: Fyxer's free plan has no drafted replies, and Superhuman's Email Assistant is $12 a month on annual billing. For support teams, Tidio gives every account 50 free Lyro AI conversations.

Is it OK to use AI to write cold emails?

Yes, as long as what the email says is true and you follow Gmail's and Yahoo's sender rules: SPF or DKIM at minimum, a spam rate under 0.3%, and for bulk senders SPF, DKIM, DMARC and one-click unsubscribe. Google advises staying below 0.10%. Invented personalization gets reported as spam, which hurts your domain.

What is the best AI email writer for Outlook?

Copilot in Outlook comes with Microsoft 365 Personal at $9.99 a month. MailMaestro works as an Outlook add-in with a free plan of 3 AI requests a week and Pro at $12 a seat a month billed annually. Superhuman's Email Assistant and Fyxer also support Outlook.