The 10 Best AI Tools for Email Writing in 2027
Curated by Kory White · Fractional CRO, CRO SyndicateEmail is still where deals are won, candidates get hired, and follow-ups go to die. In 2027, the best AI email tools no longer just fix typos — they draft full replies in your voice, summarize a 40-message thread in two lines, and rewrite a cold pitch so it actually gets answered.
This ranking covers ten tools that genuinely move the needle on email, from full AI inbox clients to writing assistants that ride along inside Gmail and Outlook.
Direct Answer
For most people writing serious volumes of email, Superhuman is the best overall AI email tool in 2027 — it pairs a fast keyboard-driven inbox with AI that writes, summarizes, and triages, starting at $25/user/month (billed annually). For value, Gmail with Gemini is the best pick: if you already pay for Google Workspace Business Standard at $14/user/month, the AI "Help me write," reply suggestions, and thread summaries come bundled at no extra charge, and there is a usable free tier of smart features in consumer Gmail too.
This list is for founders, sales reps, recruiters, customer-success managers, and busy professionals who live in their inbox and want AI to cut drafting time without making them sound like a robot. We separate true AI email clients (Superhuman, Shortwave) from assistants that ride inside your existing inbox (Gemini, Microsoft Copilot, Grammarly) and sales-specific writers (Lavender, Smartwriter, HyperWrite).
Pick based on whether you want to switch clients or just bolt AI onto what you already use. All pricing below is 2027 public list pricing.
How We Ranked the Top 10
We scored each tool against six weighted criteria, leaning on hands-on testing plus G2 and Capterra review patterns, Product Hunt launch data, and each vendor's official pricing and changelog pages.
- Output quality (30%) — does the AI draft read like a competent human, in your voice, with the right tone? We checked the underlying model (GPT-4.1/5, Claude, Gemini) where vendors disclose it.
- Ease of use (20%) — setup time, keyboard shortcuts, and how little you have to think to invoke the AI.
- Price/value (20%) — real plan prices versus what you actually get, including free tiers.
- Speed (10%) — draft latency and inbox responsiveness; Superhuman and Shortwave were tested for sub-second feel.
- Integrations and export (10%) — Gmail, Outlook, CRM (Salesforce, HubSpot), and calendar hooks.
- Learning curve (10%) — how long before a normal user is faster, not slower.
We did not reward watermark-free marketing claims; we rewarded tools that demonstrably saved time in real inboxes.
1. Superhuman 🏆 BEST OVERALL
Best for: power users and sales teams who want a fast AI inbox | Pricing: $25/user/mo (Starter, billed annually) / $33/mo monthly | Platform: web, desktop (Mac/Windows), iOS, Android
Superhuman rebuilt the email client around speed and then layered AI on top, and the combination is why it tops this list. Ask AI answers questions across your whole inbox ("what did Priya say about the contract?"), Auto Summarize collapses long threads into a one-line preview, and Write with AI drafts replies that learn your tone over time.
It now runs on a mix of frontier models including GPT-class and Claude behind the scenes, and integrates natively with Gmail and Outlook plus Salesforce and HubSpot for sales workflows. The keyboard-first design means most actions never touch the mouse, and Split Inbox auto-triages with AI so VIP and newsletter mail land in separate lanes.
It is not cheap, but for people who send 50-plus emails a day it pays for itself in recovered hours.
Pros:
- Fastest inbox feel of any AI email client tested — sub-second navigation
- Ask AI searches and answers across your entire mailbox, not one thread
- Tone-matching drafts that genuinely sound like you after a week
- Native Salesforce and HubSpot sync for sales reps
Cons:
- Expensive at $25–33/user/month with no free tier
- Only connects to Gmail and Outlook accounts
Verdict: The best all-around AI email tool in 2027 if you can justify the price and want speed plus AI in one client.
2. Shortwave
Best for: Gmail users who want a deep AI assistant without leaving Google | Pricing: Free / $7/mo Personal / $24/mo Business | Platform: web, desktop, iOS, Android
Shortwave, built by ex-Google engineers, is the most capable AI assistant for Gmail accounts and the closest challenger to Superhuman. Its AI assistant can search your inbox, schedule meetings, draft and send replies, and even chain multi-step actions through natural-language instructions.
Summaries, AI-written drafts, and a daily digest of what needs attention are all included, and the assistant taps GPT-class and Claude models depending on the task. The free plan is genuinely useful, and the $7/month Personal tier unlocks unlimited AI — far cheaper than Superhuman.
The main catch is that it only works with Gmail and Google Workspace, so Outlook users are out.
Pros:
- Best price-to-power ratio of any full AI email client
- Natural-language assistant that can take multi-step actions
- Strong free tier and a $7/mo unlimited-AI plan
- Excellent thread summaries and AI search built for Gmail
Cons:
- Gmail/Google Workspace only — no Outlook support
- Heavier assistant features can feel slower than Superhuman
Verdict: The smartest AI inbox for Gmail loyalists, and a far cheaper Superhuman alternative.
3. Gmail with Gemini 💎 BEST VALUE
Best for: Workspace customers who want AI email with zero extra cost | Pricing: Free (consumer smart features) / from $14/user/mo Workspace Business Standard | Platform: web, Android, iOS
If you already pay for Google Workspace, the AI built into Gmail via Gemini is the best value on this list because it costs nothing extra. Help me write drafts and refines emails from a short prompt, Gemini in the side panel summarizes long threads and answers questions about your inbox, and smart reply and smart compose have quietly gotten much better.
It runs on Google's Gemini models, syncs perfectly with Google Calendar, Docs, and Drive, and now reaches across your mail and files to ground its answers. Consumer Gmail includes a free slice of smart features, while full Gemini-in-Gmail comes bundled with Business Standard at $14/user/month and above.
It will not match Superhuman's speed or Shortwave's agent depth, but for most users the price is unbeatable.
Pros:
- Bundled free with Workspace Business plans — no separate subscription
- Deep ties to Calendar, Docs, and Drive for grounded drafts
- Help me write and thread summaries built right into the compose box
- Backed by Google's own Gemini models with strong reliability
Cons:
- AI features trail dedicated clients on speed and polish
- Best capabilities require a paid Workspace plan
Verdict: The clear value champion — capable AI email writing at no extra cost for Workspace customers.
4. Microsoft Copilot in Outlook
Best for: Outlook and Microsoft 365 organizations | Pricing: from $30/user/mo Microsoft 365 Copilot add-on (annual) | Platform: web, desktop, mobile
For the Outlook half of the world, Microsoft Copilot is the obvious AI email pick. Draft with Copilot writes and rewrites emails by tone and length, Summarize collapses long threads, and Coaching by Copilot scores your draft for clarity, tone, and reader sentiment before you hit send.
It runs on OpenAI's GPT models and reaches across Outlook, Word, Excel, Teams, and your Microsoft Graph so drafts can pull from documents and meetings. The catch is price: the Microsoft 365 Copilot add-on runs about $30/user/month on top of an existing 365 subscription, which adds up fast for large teams.
For enterprises already standardized on Microsoft, the integration depth justifies it.
Pros:
- Deepest integration across Outlook, Word, Excel, and Teams
- Coaching feature grades tone and clarity before you send
- Enterprise security and compliance tied to Microsoft 365
- Pulls context from your documents and meetings via Graph
Cons:
- Roughly $30/user/month on top of existing 365 licensing
- Overkill if you only need email, not the whole Office suite
Verdict: The right AI email choice for any team that lives in Outlook and Microsoft 365.
5. Grammarly
Best for: polishing tone and clarity across every app | Pricing: Free / $12/mo Pro (annual) / $15/user/mo Business | Platform: browser extension, desktop, mobile keyboard
Grammarly is the most widely used writing assistant, and it works inside Gmail, Outlook, and basically any text field through its browser extension. Beyond grammar, its generative AI drafts and rewrites whole emails, adjusts tone (more direct, more friendly, more formal), shortens, and replies from a one-line prompt.
The free tier covers core corrections, Pro at $12/month unlocks the generative features and tone rewrites, and Business at $15/user/month adds brand-voice controls and an admin console. Because it overlays your existing inbox rather than replacing it, there is almost no learning curve.
It is less of a full inbox brain and more of a universal polish layer — which is exactly what many people want.
Pros:
- Works inside virtually every email client and web app
- Strong tone and clarity rewrites, not just spelling fixes
- Genuinely useful free tier for everyday corrections
- Brand-voice profiles on the Business plan
Cons:
- No inbox triage, search, or summarization features
- Generative AI gated behind the paid Pro plan
Verdict: The best universal email-polishing layer that rides on top of whatever inbox you already use.
6. Lavender
Best for: sales reps writing cold and prospecting emails | Pricing: Free (Basic) / $29/mo Starter / $49/mo Individual Pro | Platform: browser extension, Gmail, Outlook
Lavender is the leading AI sales email coach, built specifically to get cold emails answered. It scores every draft in real time on a 0–100 deliverability and quality scale, flags spam-trigger words, checks reading level and length, and suggests rewrites for clarity and personalization.
Its personalization assistant pulls prospect data and recent activity so reps open with something relevant instead of a template. It works inside Gmail and Outlook and integrates with major sales engagement platforms like Outreach and Salesloft. The free Basic plan covers light use; Individual Pro at $49/month unlocks unlimited emails and full personalization.
It will not summarize your inbox — it is laser-focused on making outbound emails convert.
Pros:
- Real-time 0–100 scoring tuned for reply rates, not grammar
- Personalization assistant that surfaces prospect context
- Works inside Gmail, Outlook, Outreach, and Salesloft
- Free Basic tier to try before committing
Cons:
- Narrowly focused on outbound sales email only
- Pro pricing climbs to $49/month for full features
Verdict: The sharpest AI tool for sales reps who live or die by cold-email reply rates.
7. HyperWrite
Best for: AI email writing plus a broader autopilot assistant | Pricing: Free / $19.99/mo Premium / $44.99/mo Ultra | Platform: web, browser extension
HyperWrite (the successor to the Flowrite-style "turn instructions into emails" workflow) is a general AI writing assistant with a strong email focus. Its email responder turns a short instruction into a full, contextual reply, while AutoWrite and a library of custom tools handle outreach, follow-ups, and replies in your chosen tone.
The browser extension drops these into Gmail and any web text box, and its personal assistant can even take multi-step actions on the web. It runs on GPT and Claude models, offers a free tier, and unlocks unlimited generations on Premium at $19.99/month. It is more of a Swiss-army writing tool than a dedicated inbox, which makes it flexible but less specialized than Superhuman or Lavender.
Pros:
- Turns one-line instructions into full email drafts fast
- Works in Gmail and any web text field via extension
- Affordable $19.99/mo unlimited Premium plan
- Doubles as a general-purpose AI writing assistant
Cons:
- No inbox management, triage, or summarization
- Email is one feature among many, not the core product
Verdict: A flexible, affordable AI writer that handles email replies well alongside broader writing tasks.
8. Smartwriter
Best for: high-volume personalized cold outreach at scale | Pricing: from $59/mo Basic / $149/mo Popular | Platform: web
Smartwriter is built for one job: generating hyper-personalized cold email and LinkedIn outreach at scale. It scrapes a prospect's website, recent posts, awards, and bio, then auto-writes personalized intro lines and full emails for hundreds of leads in a batch. It connects to LinkedIn, your CRM, and cold-email platforms so the generated copy flows straight into sequences.
Pricing starts at $59/month for the Basic plan and climbs with credit volume, which positions it as a B2B sales and agency tool rather than a personal assistant. It is genuinely strong at researched personalization, but the output still needs a human review pass before you send — automation at this scale can occasionally miss context.
Pros:
- Researches each prospect and writes personalized openers automatically
- Batch-generates outreach for hundreds of leads at once
- Integrates with LinkedIn, CRMs, and cold-email tools
- Built specifically for B2B outbound and agencies
Cons:
- Pricier, credit-based plans starting at $59/month
- Generated copy needs human review before sending
Verdict: The pick for sales teams and agencies that need researched, personalized cold outreach in volume.
9. Mailmodo
Best for: marketers writing and designing email campaigns | Pricing: from $39/mo Lite / $79/mo Pro (annual) | Platform: web
Mailmodo is an email marketing platform with AI baked into the campaign workflow, so it earns a spot for anyone whose "email writing" means newsletters and broadcasts rather than one-to-one replies. Its AI assistant generates subject lines, body copy, and even interactive AMP email blocks (polls, forms, carousels that work inside the inbox), while AI helps optimize send times and segments.
It integrates with HubSpot, Salesforce, and Zapier and reports open and click performance natively. Plans start around $39/month and scale by contact count. This is not a personal-inbox tool — it is for marketing and lifecycle email — but its AI copy and interactive blocks are a real edge for campaign work.
Pros:
- AI-generated subject lines and campaign copy that convert
- Interactive AMP email blocks like forms and polls
- Native HubSpot, Salesforce, and Zapier integrations
- Built-in analytics for opens, clicks, and segments
Cons:
- Campaign tool, not a personal inbox assistant
- Contact-based pricing scales up for larger lists
Verdict: The best AI choice for marketers writing campaign and newsletter email, not one-to-one replies.
10. Compose AI
Best for: free everyday autocomplete and quick replies in Gmail | Pricing: Free / $9.99/mo Premium (annual) | Platform: Chrome extension
Compose AI is the lightweight, low-cost way to add AI to email, and its generous free tier makes it a fine entry point. The Chrome extension provides AI autocomplete as you type, generates full emails from a one-line prompt, offers one-click replies, and rewrites or shortens text inside Gmail and other web apps.
It runs on GPT-class models and claims to cut typing time substantially through autocomplete alone. The free plan covers a monthly word allowance, and Premium at $9.99/month removes the cap. It is the least powerful tool here — no inbox management, no triage — but for someone who just wants faster typing and quick AI drafts without paying much, it does the job.
Pros:
- Genuinely useful free tier with monthly word allowance
- AI autocomplete speeds up typing across the web
- One-click replies and full-email generation in Gmail
- Cheap $9.99/mo Premium with no word cap
Cons:
- No inbox triage, search, or summarization
- Chrome extension only — limited platform reach
Verdict: The best free or near-free way to add AI autocomplete and quick replies to Gmail.
Which One Is Right for You?
What to Look For
- Free vs paid trade-off — start on a free tier (Shortwave, Grammarly, Compose AI, consumer Gmail) before paying; only upgrade once AI actually saves you time daily.
- Data privacy and training opt-out — check whether your email content is used to train models. Enterprise plans from Microsoft, Google, and Superhuman generally exclude business data from training; verify before connecting a work mailbox.
- Export and licensing rights — you own the email copy these tools generate, but confirm the vendor's terms, especially for AI-written marketing content you publish at scale.
- Integration with your stack — match the tool to your inbox (Gmail vs Outlook) and your CRM (Salesforce, HubSpot). A tool that does not connect to your stack will create copy-paste friction.
- Output limits and credits — watch for monthly word caps and per-seat credit pools, especially on sales tools like Smartwriter, where heavy use gets expensive fast.
What matters less than the hype: the specific underlying model. Most of these tools route to GPT, Claude, or Gemini and the difference in everyday email drafting is small — the inbox integration and tone control matter far more than which model name is on the box.
FAQ
Which AI email tool is best overall in 2027? Superhuman is the best overall for people who write high volumes of email and want speed plus AI in one fast client, starting at $25/user/month. If you prefer to keep Gmail, Shortwave is the closest and cheaper alternative at $7/month for unlimited AI.
What is the best free AI email tool? For Workspace users, Gmail with Gemini is the best value since AI is bundled into paid plans, and consumer Gmail includes free smart features. Shortwave, Grammarly, and Compose AI all offer genuinely useful free tiers for AI drafting and polish.
Can AI write emails that sound like me? Yes. Superhuman, Shortwave, and Grammarly learn your tone over time, and HyperWrite and Compose AI let you specify tone and style. Expect to lightly edit AI drafts at first; the match improves with use.
Which AI tool is best for cold sales emails? Lavender is the best for one-to-one cold emails because it scores drafts on reply likelihood and helps personalize. For high-volume, researched outreach across hundreds of leads, Smartwriter generates personalized copy at scale.
Does AI email work in Outlook? Yes. Microsoft Copilot in Outlook is the deepest Outlook-native option, and Superhuman, Grammarly, and Lavender all support Outlook accounts too. Shortwave and Gmail with Gemini are Gmail/Workspace only.
Is my email data safe with these AI tools? Reputable enterprise plans from Microsoft, Google, and Superhuman exclude your business email from model training and offer compliance controls. Always check the data-handling terms before connecting a work mailbox, especially for smaller third-party extensions.
Bottom Line
Superhuman is the best overall AI email tool in 2027 — fast, smart, and built for people who send dozens of emails a day, at $25/user/month (annual). The best value is Gmail with Gemini: if you already pay for Google Workspace from $14/user/month, the AI writing, replies, and thread summaries come bundled at no extra cost, and consumer Gmail offers a free slice too.
Between those two extremes, pick Shortwave for cheap Gmail power, Microsoft Copilot for Outlook shops, Grammarly for universal polish, and Lavender or Smartwriter for sales outreach. Match the tool to your inbox and your job, and let AI reclaim the hour a day you spend drafting.
Sources
- Superhuman official site and pricing
- Shortwave plans and AI assistant
- Gmail with Gemini — Google Workspace
- Microsoft 365 Copilot
- Grammarly pricing and plans
- Lavender AI sales email coach
- HyperWrite AI writing assistant
- Compose AI
- G2 AI email assistant software category
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