Top 10 AI Email Writing Tools

Email remains the backbone of professional communication, yet most people spend far too long crafting messages that could be written in seconds with AI assistance. The best AI email tools do more than suggest words — they understand tone, context, and intent, helping you communicate more effectively while saving hours each week.

We tested AI email writing tools on speed, quality, tone accuracy, and integration with popular email clients. Here are the ten that delivered the best results.

The Ranking

1. Microsoft Copilot in Outlook

Microsoft Copilot in Outlook is the most seamless AI email experience available. It drafts replies based on email threads, summarizes long chains, adjusts tone from casual to formal, and even pulls in relevant data from your calendar and files. Since it works directly within Outlook, there is zero context-switching.

Best for: Outlook users, enterprise email, thread management Integration: Native Outlook integration Price: $30/user/month with Microsoft 365 Copilot Rating: 9.5/10

2. Google Gemini in Gmail

Google Gemini brings AI directly into Gmail with "Help me write" and "Help me reply" features. It understands conversation context, suggests appropriate responses, and can draft emails from brief prompts. For the billions of Gmail users, this integration is transformative.

Best for: Gmail users, Google Workspace teams Integration: Native Gmail integration Price: Included with Google Workspace Rating: 9.3/10

3. Grammarly

Grammarly goes beyond grammar checking in emails to offer full AI writing assistance. It suggests better phrasing, adjusts tone, and can generate complete email drafts. The browser extension works across all web-based email clients, and dedicated plugins exist for Outlook and mobile keyboards.

Best for: Email polishing, cross-platform compatibility, tone adjustment Integration: Browser extension, Outlook plugin, mobile keyboard Price: Free tier; Premium $12/month Rating: 9.0/10

4. ChatGPT

ChatGPT is many professionals' go-to for drafting important emails. While it lacks direct email integration, its ability to understand nuanced requests makes it unmatched for complex communications — apology emails, negotiation responses, executive summaries, and sensitive situations where tone is critical.

Best for: Complex emails, sensitive communications, high-stakes correspondence Integration: Web/app (copy-paste workflow) Price: Free tier; Plus $20/month Rating: 8.8/10

5. Claude

Claude excels at email writing that requires nuance and careful reasoning. Its responses tend to be more balanced and thoughtful, making it ideal for professional correspondence where you need to present complex ideas clearly. Claude is particularly strong at maintaining a consistent professional voice.

Best for: Nuanced professional emails, complex topics, balanced communication Integration: Web/app (copy-paste workflow) Price: Free tier; Pro $20/month Rating: 8.6/10

6. Jasper Email Templates

Jasper offers specialized email templates for marketing and sales teams. From cold outreach sequences to newsletter content, Jasper understands marketing email best practices and generates copy that drives engagement. Its brand voice feature ensures consistency across team communications.

Best for: Marketing emails, sales outreach, email campaigns Integration: Platform with export capabilities Price: From $49/month Rating: 8.3/10

7. Copy.ai Email

Copy.ai provides AI-powered email generation with a focus on sales and marketing use cases. Its workflow automation can generate personalized email sequences from prospect data, making it valuable for sales teams doing outreach at scale.

Best for: Sales email sequences, personalized outreach at scale Integration: CRM integrations, API Price: Free tier (2,000 words/month); Pro $36/month Rating: 8.0/10

8. HubSpot AI Email

HubSpot AI generates marketing emails within the HubSpot CRM ecosystem. It suggests subject lines, writes email body copy, and optimizes send times based on contact engagement data. The CRM context means emails are automatically personalized with contact information.

Best for: CRM-integrated marketing emails, personalization at scale Integration: Native HubSpot integration Price: Included with HubSpot Marketing Hub Rating: 7.8/10

9. Writesonic Email

Writesonic offers email generation templates that cover common professional scenarios: follow-ups, introductions, proposals, and thank-you notes. The quality is solid for routine correspondence, and the speed is impressive.

Best for: Routine professional emails, quick drafts Integration: Web platform Price: Free tier; Pro plans available Rating: 7.5/10

10. Notion AI for Email Drafts

Notion AI is useful for drafting emails within your project management context. Write an email about a project update, and Notion AI can pull relevant details from your workspace to create informed, accurate correspondence.

Best for: Project-related emails, context-aware drafts Integration: Notion workspace Price: AI add-on $8/member/month Rating: 7.3/10

Comparison Table

Final Picks

Best for Outlook users: Microsoft Copilot — seamless, context-aware, and powerful.

Best for Gmail users: Google Gemini — native integration that just works.

Best cross-platform: Grammarly — works everywhere you write emails.

Best for important emails: ChatGPT or Claude — when the stakes are high, take the time to craft the message in a dedicated AI tool.

The ideal setup is a native integration (Copilot or Gemini) for routine emails, plus ChatGPT or Claude for high-stakes communications that deserve extra attention.