With the rise of AI tools, busy professionals and marketers are turning to one solution: the AI email generator. These tools utilize advanced language models (LLMs) to draft, personalize, and optimize emails in seconds, significantly enhancing productivity and response rates.
If you’re searching for the best AI email generator to conquer your inbox, or looking for a powerful free AI email generator to start with, you've come to the right place. We’ve reviewed the top contenders for 2025 to help you find the perfect AI generator for your needs.
What is an AI email generator?
An email generator AI is a software tool that uses large language models (LLMs) to automatically generate or reply to email messages based on a user’s short prompt, context, or previous conversations. It goes beyond basic templates or "smart replies" by:
Matching your style: Adopting your personalized greetings and sign-offs, matching the pacing of your emails, and using commonly used terms if you’re in a technical field or prefer certain phrases.
Adapting tone: Adjusting the language to be formal, friendly, persuasive, or apologetic.
Using context: Pulling in details like names, dates, and background information from an email thread.
Generating full drafts: Producing complete, structured emails, not just short snippets or quick replies.
The 10 Best AI email generator tools
The market for AI writing tools has matured significantly. Here are the top tools that stand out across different use cases, from daily workflow to large-scale marketing campaigns.
|
AI generator |
Best for |
Key standouts |
|
Spark +AI |
Integrated AI assistance within a dedicated email client. |
"My Writing Style" feature learns from real emails and adapts to your voice. |
|
Superhuman Go |
Every day professional clarity & tone correction. |
Real-time writing and tone adjustment inside Gmail/Outlook. |
|
Jasper AI |
Content marketing & maintaining a strong brand voice. |
Highly consistent brand voice training for all content types. |
|
SmartWriter |
Hyper-personalized cold sales outreach (B2B). |
Scraping LinkedIn/CRM data for hyper-personalized icebreakers. |
|
Google Gemini (Workspace) |
Seamless integration for Google Workspace users. |
Drafts, summarizes, and prioritizes right inside Gmail. |
|
Writesonic |
Generating a high volume of marketing/sales copy. |
Specialized email templates for marketing, cold outreach, and subject lines. |
|
ChatGPT |
Drafting complex, creative, or long-form emails. |
Pure LLM power with highly flexible generation based on detailed prompts. |
|
AImReply |
Quick, one-off email drafting with no sign-up required. |
A completely free, no-login-required tool for fast, multi-language replies. |
|
Mailmodo AI Writer |
Generating marketing-focused content and subject lines. |
A standalone free tool from a dedicated email marketing platform. |
|
Notion AI |
Integrating emails with an all-in-one knowledge base. |
Ability to generate an email from a detailed project brief or meeting notes stored in Notion. |
Key tools to look for in an AI email generator
The right AI email generator can significantly streamline your workflow, helping you draft clearer, more professional messages quickly. When choosing your tool, focus on your primary needs, as the best fit depends entirely on what you need:
Integration: Works directly in your inbox (Gmail, Outlook, Spark) or with your CRM (HubSpot, Salesforce).
Tone customization: The ability to easily shift the tone is crucial for professional communication.
Context understanding: Access to previous emails in the thread for relevant and non-robotic replies or summaries.
Automation: Tools that can generate personalized emails in bulk or integrate into automated campaign workflows.
Our top picks
Spark +AI
Spark +AI is designed to speed up and simplify your email work by generating and editing emails, helping you craft the perfect email in seconds.
Compose with My Writing Style: Go beyond simple auto-complete. Spark's drafting tool generates full email responses from brief prompts. “My Writing Style” can analyze your sent emails to learn and apply your specific voice, tone, and formality, ensuring authentic communication.
Summarize: Quickly catch up on long email chains and complex documents. This feature condenses lengthy content into succinct summaries or actionable bullet points, so you never miss a critical detail when you are CC'd on a thread.
Rephrase: Refine your communication effortlessly. Write a quick draft and instantly adjust the tone (e.g., from friendly to formal, or casual to professional) and rephrase sentences with a single click before sending.
Translate: Instantly compose or translate your own drafts or received messages to communicate confidently in any language and break down language barriers.
Superhuman Go
Superhuman Go acts as a writing partner, seamlessly integrating with most platforms — including Gmail, Outlook, and Slack — while checking grammar, spelling, and style in real time. Beyond corrections, it helps adjust tone to suit your audience, ensuring every email or message communicates exactly what you intend.
Its "Rewrite" function allows you to instantly change an email's intent, while AI-powered suggestions can help you make your writing clearer, more concise, or more engaging without losing your personal voice.
Jasper AI
Jasper is the powerhouse for businesses and marketing teams. If your brand voice is critical, Jasper can be trained on your style guide to ensure every email sounds distinctly "you."
Excellent for long-form email content, newsletters, and email sequences where maintaining a consistent, high-quality voice across the entire campaign is essential.
SmartWriter
For sales professionals, sending generic cold emails is a waste of time and effort. SmartWriter excels at research-driven personalization, significantly boosting reply rates for outbound sales teams.
The ability to pull data from a prospect's LinkedIn profile or recent activity to craft highly specific, relevant, and engaging opening lines.
With many AI generators at your fingertips, the biggest productivity boost comes from AI built directly into your inbox. Spark +AI offers integrated AI assistance to help keep you in the flow. Summarize threads, rephrase messages, and communicate in your own style without leaving the app. With built-in translation and seamless assistance, Spark +AI is the ultimate tool for professionals and teams looking to master their inboxes in 2025.
The Readdle Team 
