Best 7 Free AI Tools for Email Marketing Copywriting

Discover 7 powerful AI tools designed specifically for email marketing that won’t cost you a dime. Learn how to choose the right tools for your workflow, leverage them for better subject lines, personalization, and A/B testing—and start writing better emails today.

Why Use AI for Marketing Emails?

Staring at a blank email screen isn’t fun. The cursor blinks. Minutes pass. You’re supposed to write something compelling, personalized, and on-brand—but you’re just trying to find the first sentence. Sound familiar?

Here’s the thing: writing effective marketing emails is hard. You need to grab attention in the subject line, maintain your brand voice, personalize for different segments, and create multiple versions for testing. Multiply that across regular campaigns, newsletters, launch sequences, and re-engagement emails, and suddenly you’re drowning in work.

This is exactly where AI tools shine. They don’t replace your judgment—they amplify it. AI helps you overcome “blank page syndrome,” brainstorm angles quickly, test multiple variations of copy and subject lines, and personalize at scale. For solopreneurs, marketers, and small business founders managing everything themselves, AI can feel like having a dedicated copywriter on your team.

If you’ve already started using AI in your broader marketing stack, like the tools we cover in our guide on AI applications in modern marketing, email is one of the easiest places to see quick wins.

Here are the core benefits:

• Faster ideation: Generate 5–10 subject line variations in seconds instead of debating options for 20 minutes.
• Better A/B testing: Create multiple email versions to test different hooks, tones, and CTAs without writing from scratch.
• Personalization without complexity: Segment audiences and tailor messaging based on behavior, without needing a data science degree.
• Time savings: Automate routine writing tasks so you can focus on strategy, design, and results analysis.
• Consistency: Maintain brand voice across campaigns by training AI on your tone and messaging guidelines.

The key insight? AI isn’t your copywriter. It’s your productivity lever. You still make the final calls about brand fit, audience relevance, and strategy. If you want to squeeze even more value from these tools, pairing them with a solid prompt-writing framework will multiply your results.

How to Evaluate AI Tools for Email Marketing

Before we dive into the 7 tools, let’s establish a framework. Not all AI tools are created equal—and not all are good for email marketing specifically. Here’s what to look for:

• Ease of use – Does it require technical knowledge, or can a non-technical marketer jump in?
• Clear free or free-tier pricing – You shouldn’t need a credit card or complex setup just to try it.
• Tone flexibility – Can you adjust the output to match your brand voice (professional, casual, urgent, etc.)?
• Integration options – Does it work with your existing stack (Mailchimp, ConvertKit, WordPress, etc.) via copy-paste, extensions, or APIs?
• Email-specific features – Does it handle subject lines, body copy, CTAs, and personalization? Or is it just generic writing software?

With these criteria in mind, here are the 7 tools that stand out.

7 Free AI Tools to Write Better Marketing Emails

1. ChatGPT (Free Plan – GPT-4o mini)

What it is

ChatGPT is OpenAI’s conversational AI and arguably the most versatile AI tool on the market. The free version gives you access to GPT-4o mini, which is surprisingly capable for email copywriting. No credit card required; you just need an OpenAI account. While the free plan has some limits (20 messages every 3 hours), it’s more than enough to draft emails, iterate on copy, and brainstorm subject lines.

ChatGPT excels because you can write detailed prompts (for example: “Write a re-engagement email for subscribers who haven’t opened in 90 days—tone should be warm, not pushy, and it should mention their last purchase”). It learns from your feedback and adapts as you refine your requests.

Best for

• Subject line brainstorming (3–5 variations)
• Full email body copy from keywords or bullet points
• Tone adjustments (make it urgent, casual, professional, funny, etc.)
• A/B testing (generate multiple versions of the same email)
• Translation and multi-language campaigns
• Turning feature lists into benefit-driven copy

Example use case

You’ve got a product launch next week, and you need a welcome series for new subscribers. Instead of spending 2 hours drafting 3 emails from scratch, you give ChatGPT a brief:

“Write a 3-email welcome series for a SaaS tool. Email 1: introduce features (120 words). Email 2: social proof / testimonials (100 words). Email 3: limited-time discount offer (110 words). Tone: friendly, professional.”

Within seconds, you have three drafts to refine.

Pros & limitations

ChatGPT’s biggest advantage is its flexibility and conversational feedback loop—you can iterate endlessly. It’s also free for meaningful usage. The main limitation? You need to prompt it well (vague prompts = vague results). Also, it doesn’t natively integrate with email platforms, so you’ll copy-paste output. For very large campaigns, the free tier’s rate limits might feel restrictive.

If you’re not confident in your prompting skills yet, check out our guide on how to write effective ChatGPT prompts and reuse the templates there for email tasks.

2. Claude 3.5 Sonnet (Free Plan)

What it is

Claude is Anthropic’s AI assistant, and many copywriters swear by it for email work. The free version offers a generous daily usage limit with Claude 3.5 Sonnet—a model trained to be more empathetic, safer, and aligned with human values. Claude is particularly strong at understanding context and nuance, which matters for email copy that needs to feel human rather than generic.

Best for

• Long-form email copy (newsletters, multi-part sequences)
• Empathetic, customer-focused messaging (re-engagement, apologies, thank-you emails)
• Brand voice consistency (it’s excellent at learning your tone)
• Complex email narratives (e.g., case studies, product updates)
• Sensitive communications (customer service follow-ups, churn prevention)

Example use case

You’re writing a re-engagement email to customers who’ve been silent for 3 months. You could give Claude this prompt:

“Write a warm, respectful 200-word email to a long-time customer who hasn’t opened our emails in 90 days. Mention we’ve launched new features they might love. Tone: genuine, never pushy. Include a CTA to explore what’s new, and sign off personally.”

Claude typically produces copy that feels genuine and less “AI-like” than many competitors.

Pros & limitations

Claude’s output often reads very naturally, and it’s great for long-form content. The free tier is generous. However, like ChatGPT, you’re copy-pasting into your email platform—no native integration. Also, it can sometimes be too cautious, generating very neutral copy if you don’t push for personality.

3. Google Gemini (Free Plan – Gemini 1.5)

What it is

Google’s Gemini is a newer player but increasingly popular for marketing work. The free plan gives you access to Gemini 1.5, which integrates seamlessly with Google Workspace (Gmail, Google Docs, Google Sheets). If you already live in Google’s ecosystem, this is a no-brainer.

Gemini shines because it can analyze real-time data and pull insights from your existing documents—like analyzing past email performance in Sheets to suggest what subject lines worked best. This ties in nicely if you’re already experimenting with AI to boost overall business productivity.

Best for

• Subject line optimization (especially if you have performance data in Sheets)
• Data-driven personalization (analyzing customer segments from a spreadsheet)
• Email campaigns integrated with Google Workspace
• Quick copy refinement and rewriting
• Analyzing competitor emails or past campaigns
• Content ideas based on trending search data

Example use case

You’re prepping 3 variations of a launch email. You paste 6 months of past email performance data into a Google Sheet (open rates, click rates by campaign type). Then you ask Gemini:

“Based on this data, which subject line angles perform best for product launches? Generate 5 subject lines under 50 characters following these patterns.”

Gemini analyzes the data and creates targeted suggestions.

Pros & limitations

Seamless Google integration is huge if that’s your workflow. Real-time data analysis is powerful. The catch? Gemini’s creative output can be less polished than ChatGPT or Claude for pure copywriting. Also, it’s less intuitive if you’re not already in Google Workspace. The free tier has usage limits.

4. HubSpot’s Free AI Email Generator

What it is

HubSpot offers a completely free AI email generator (no credit card required, no hidden tier). You input your email’s goal, talking points, and desired tone, and it generates full email drafts. Unlike standalone AI tools, this one is built specifically for email marketing and integrates with HubSpot’s CRM and email platform.

If you’re already using HubSpot (even the free tier), this fits directly into your workflow—no copy-pasting needed.

Best for

• Campaign email drafting (faster than starting from scratch)
• Subject line generation (integrated into email templates)
• Tone adjustments for different audience segments
• Marketer-friendly workflows (drag-and-drop, not code)
• Small teams without a dedicated copywriter

Example use case

You’re sending a follow-up email to webinar attendees. You open HubSpot’s email tool, click “Generate with AI,” and fill in:

• Purpose: “Follow-up to webinar attendees, remind them of key takeaways, offer a one-on-one consultation.”
• Talking points: “Time-saving automation, ROI improvement, 30-day trial.”
• Tone: “Professional but approachable.”

HubSpot generates a complete email draft in seconds, ready to customize and send.

Pros & limitations

Built for email marketers, great integration if you use HubSpot. Simple, no steep learning curve. The limitation? It’s tied to HubSpot’s platform. If you use Mailchimp or Brevo, you won’t get the same integration. The output can sometimes feel templated; you’ll usually want to refine it.

5. Brevo’s Free AI Email Generator

What it is

Brevo (formerly Sendinblue) offers a free AI email generator with low signup friction. You input a topic, and it generates subject lines, body copy, and CTAs. The tool also includes features for translating emails into 100+ languages and adjusting tone (20+ tone options).

What makes Brevo special? It’s email-focused and includes a free email marketing plan with 300 emails/day, so you can generate and send campaigns without ever paying.

Best for

• Subject line generation (3 variations at a time)
• Email body copy from keywords
• Tone adjustments (switch between professional, casual, urgent, friendly, etc.)
• Multilingual campaigns (translate and localize emails)
• Email writers who also need a free email service

Example use case

You’re launching a newsletter in 3 languages. You draft the English version, use Brevo’s AI to refine the subject line for urgency and clarity, then use the translation feature to auto-generate Spanish and French versions. Brevo then sends all three via their free email service.

Pros & limitations

Very user-friendly, email-specific, and includes a full email platform in the free tier. Great for small businesses and creators. The limitation? The AI feels slightly less sophisticated than ChatGPT or Claude. The interface is simpler (good for beginners, limiting for power users). Integration with other platforms is limited.

6. Rytr (Free Plan – 10,000 Characters/Month)

What it is

Rytr is a lightweight AI writing assistant with a generous free plan: 10,000 characters per month (roughly 2,000 words). It’s purpose-built for content creators and includes 40+ templates, including email-specific templates for newsletters, promotions, and follow-ups.

Rytr focuses on simplicity—it’s not overpowered or complex, making it ideal for solopreneurs and small business owners. You can also save custom “tones” so it learns your voice over time.

Best for

• Email newsletters (built-in templates)
• Promotional emails and announcements
• Customer follow-ups and re-engagement
• Small batch email writing (10–15 emails/month fits the free tier)
• Users who like simplicity over features

Example use case

Every week, you send a 500-word newsletter. Instead of writing from scratch, you use Rytr’s Newsletter template: input your topic and key points, and it generates a draft. Edit it for brand voice and send it out. At 500 words/week, you’ll stay well within the free 10K character limit.

Pros & limitations

Affordable on paid tiers, straightforward, and includes image generation at higher plans. The free plan is genuinely useful for regular creators. The downside? 10K characters/month is limiting if you write a lot. The AI output can feel more templated than ChatGPT. There’s no native email platform integration.

7. Mailmeteor’s Free Subject Line Generator

What it is

Mailmeteor specializes in subject line optimization. Their free generator takes your email description and generates 5 subject line options instantly—no account required. It scores each subject line (0–100) based on engagement factors like clarity, curiosity, urgency, and CTR potential.

If you only need help with subject lines (arguably the most important part of an email), this tool is laser-focused and dead simple.

Best for

• Subject line A/B testing (generate 5 options, test which perform best)
• Urgency optimization (e.g., does this subject line feel compelling enough?)
• Quick brainstorming (2 minutes to get 5 solid options)
• Users who need 1 tool, not a suite

Example use case

You’ve written a great re-engagement email, but you’re torn between 3 subject lines. You paste them into Mailmeteor along with the email description (“Re-engagement email to lapsed subscribers, highlighting new features”), and it instantly scores them:

• “Get Back What You’ve Been Missing” (87/100)
• “We’ve Built Something New Since You Left” (82/100)
• “Your Next Favorite Feature Is Here” (79/100)

The top scorer has a better clarity and curiosity balance.

Pros & limitations

Super fast, free, no account needed, and scores are helpful for decision-making. The downside? It only does subject lines—you still need another tool for body copy. The scoring algorithm is proprietary, so you have to trust it. There’s no direct integration with email platforms.

AI-Powered Email Marketing Workflow: From Idea to Results

How to Build a Simple AI-Powered Email Workflow

Now that you know the tools, here’s how to combine them in a practical workflow. You don’t need every tool—pick 1–2 that fit your work style. This mirrors the way we build simple AI workflows in our guides on AI-powered content funnels and AI productivity.

Workflow for a marketing manager writing 3 campaign emails/week:

1. Step 1: Brainstorm & Outline (ChatGPT or Claude)
   Use ChatGPT or Claude to brainstorm email angles and create an outline.
   Example: “I’m writing a webinar follow-up email. What are 5 angles I could use? (e.g., FOMO, social proof, educational)”
2. Step 2: Draft Body Copy (Same tool or HubSpot)
   Use the same AI tool to write 200–250 words of email body based on your outline.
   If you use HubSpot, paste your talking points directly into their generator.
3. Step 3: Generate & Test Subject Lines (Mailmeteor + ChatGPT)
   Use Mailmeteor or ChatGPT to generate 5 subject line options.
   Pick your top 3 and plan an A/B test (most email platforms let you test 2 subject lines).
4. Step 4: Personalize (Brevo or HubSpot)
   Use Brevo or HubSpot to adjust tone for different segments.
   Example: VIP subscribers get an urgent tone; new subscribers get a friendly, educational tone.
5. Step 5: Review & Edit (Manual)
   Read the email out loud.
   Check that it aligns with your brand voice.
   Fix any awkward phrasing.
   Add data, links, or specific offers that AI can’t know about.
6. Step 6: Test & Send (Your email platform)
   Send the A/B test.
   Track opens, clicks, and conversions.
   Note what worked for future campaigns.

Total time: 30–45 minutes for a complete campaign email, down from 2–3 hours writing manually.

Common Mistakes When Using AI for Email Copy

Just because AI is powerful doesn’t mean it’s magic. Here are the biggest pitfalls to avoid:

Mistake 1: Copy & Paste Without Editing

AI output is a starting point, not a finished product. The biggest mistake is sending AI-generated copy without personalizing it for your brand voice, audience, and context.

Fix: Always read the output aloud. Edit for tone, specificity, and brand personality. Add details (names, data, personalization) that make it feel human.

Mistake 2: Vague Prompts = Vague Results

If you ask ChatGPT to “write an email,” you’ll get a generic result.

Fix: Be specific. Include:

• Audience (founders, freelancers, agencies?)
• Email type (welcome, promotional, educational?)
• Desired tone (urgent, friendly, professional?)
• Length
• Any specifics (mention a feature, pain point, or offer)

If you need help here, reuse the structure from our 5-step prompt framework.

Mistake 3: Ignoring Segmentation & Personalization

AI can personalize at scale, but only if you tell it to. Sending the same email to all subscribers wastes the technology’s potential.

Fix: Segment first (new vs. long-time subscribers, high-value vs. low-value, engaged vs. dormant), then use AI to create tailored subject lines and messaging for each group.

Mistake 4: Optimizing for Open Rates Only

It’s easy to get seduced by clickbait subject lines that boost opens but disappoint readers.

Fix: Balance your metrics. Track open rates, click-through rates, conversions, and unsubscribe rates. A subject line that gets 50% opens but makes people unsubscribe is a net loss.

Mistake 5: No Human Review of Compliance & Accuracy

AI can hallucinate details (making up stats or claims that aren’t true) or miss compliance requirements (unsubscribe links, privacy info, etc.).

Fix: Always review AI output for factual accuracy and compliance. If you claim “we helped 1,000 companies,” make sure that’s true. Make sure your unsubscribe link and privacy policy are present.

Mistake 6: Set & Forget

Once you build an AI email workflow, don’t stop tuning it. Subscriber preferences change, your product evolves, and competitors adapt.

Fix: Review performance data monthly. Ask:

• “What subject lines worked best?”
• “Which segments had the highest open rates?”
• “What tone resonated most?”

Adjust your AI prompts and your tool stack based on these findings. You can even borrow ideas from how we analyze campaigns in our AI + marketing strategy articles.

Conclusion

AI doesn’t replace you—it multiplies you. With the right tools, you can write better emails faster, test more variations, and personalize at scale. The 7 tools above are all completely free to start with, and they cover every stage of email copywriting: ideation, drafting, subject line optimization, tone adjustment, and translation.

Here’s your next move:

• Pick 1–2 tools that align with your workflow.
  • If you want flexibility and power, start with ChatGPT or Claude.
  • If you prefer simplicity and email-specific features, try HubSpot’s generator or Brevo.
  • If you just need subject lines, Mailmeteor is perfect.
• Then pick a single email campaign this week—a newsletter, welcome series, or re-engagement campaign—and use AI to speed it up.

See how much time you save. Measure the results (open rate, click rate, conversion). Then build from there.

The marketers, founders, and solopreneurs who adopt AI for email marketing now will have a massive productivity advantage over those who wait. Start small, iterate, and build your own “AI email stack”—and if you want to go further, pair it with the workflows we share in our guides on AI tools for marketers and AI-powered content productivity.