Writing email copy is the bottleneck for most SaaS founders. You know you should send a welcome sequence, a trial conversion series, weekly updates, and re-engagement campaigns. But writing 30+ emails takes time you don't have. AI copywriting tools are the practical solution.

Some are standalone writing tools (use them with any email platform). Others are built into email platforms (generate content where you send it). Both have gotten genuinely good. The generated copy isn't perfect, but it's a strong starting point that cuts writing time by 50-80%.

Here's what works.

Standalone AI Writing Tools

These work with any email platform. Generate the copy, then paste it into your email tool.

1. ChatGPT / Claude

Best for: General-purpose email copywriting with maximum flexibility

The large language models (ChatGPT, Claude) are the most flexible email copywriting tools available. Give them context about your product, audience, and goals, and they generate email drafts, subject lines, sequences, and entire campaigns.

The key is prompting. "Write a welcome email" produces generic output. "Write a welcome email for a developer tool that helps SaaS founders track subscription metrics. The tone should be casual and founder-to-founder. Keep it under 150 words. Include a clear CTA to connect Stripe." produces much better results.

Best for: Any email type, full creative control, iterative refinement Pricing: Free tier available, from $20/month for premium Pros: Most flexible, best at understanding context, iterative refinement, improving rapidly Cons: Requires good prompting, no email-specific features, output needs formatting for email

2. Jasper

Best for: Marketing teams wanting email-specific AI templates

Jasper offers email-specific templates: subject lines, promotional emails, newsletters, follow-ups, and cold outreach. The templates guide the AI with structured inputs (product description, target audience, tone, key points), which produces more consistent output than open-ended prompting.

Jasper also supports brand voice training. Feed it your existing emails and brand guidelines, and it generates content that matches your style. For teams that need consistent brand voice across many emails, this is valuable.

Best for: Marketing teams, brand voice consistency, structured email generation Pricing: From $39/month Pros: Email-specific templates, brand voice training, consistent output, team features Cons: Expensive for individual use, output can feel template-y, requires training for best results

3. Copy.ai

Best for: Quick email copy generation with workflow automation

Copy.ai generates email content with a focus on speed. Input your topic and tone, and it produces multiple variants in seconds. The workflow feature lets you chain multiple generations: create a subject line, then generate body copy that matches, then create a P.S. line.

For teams that need to produce many email variants (A/B testing, personalization) quickly, Copy.ai's batch generation is efficient. Generate 10 subject line variants in 30 seconds rather than brainstorming for an hour.

Best for: Batch generation, A/B test variants, quick drafts Pricing: Free tier available, from $36/month Pros: Fast generation, multiple variants, workflow chaining, batch production Cons: Quality varies, less sophisticated than ChatGPT/Claude for complex asks

Email Platforms With Built-In AI Copywriting

These generate email copy directly within the email tool, with brand context already loaded.

4. Sequenzy

Best for: AI-generated SaaS email sequences that match your brand

Sequenzy's AI generates complete email sequences based on your goal ("convert trial users," "recover churned customers," "onboard new users"). It reads your website to understand your brand, product, and positioning, then generates multi-email sequences with appropriate subject lines, content, and timing.

The advantage over standalone AI tools is context. Sequenzy knows your brand, your email sending history, and SaaS email best practices. The generated sequences are designed for SaaS lifecycle email specifically, not generic marketing.

Best for: Full SaaS sequence generation, brand-aware content, lifecycle email Pricing: From $29/month Pros: Generates complete sequences, brand-aware, SaaS lifecycle focus, subject lines + body Cons: Limited to Sequenzy platform, needs review before activating, generated content may need editing

5. Mailchimp

Best for: AI copywriting accessible to non-technical users

Mailchimp's Intuit Assist generates email content within the campaign builder. Describe what you want to say, choose a tone, and get a draft. The AI also suggests subject lines and preview text. For small businesses without copywriting experience, having AI assistance right in the email builder lowers the barrier to sending effective campaigns.

The generated content is decent for straightforward use cases: product announcements, promotional emails, and newsletters. It's less effective for nuanced SaaS lifecycle emails or technical content.

Best for: Small businesses, non-technical users, campaign-based email Pricing: Free up to 500 contacts, from $13/month Pros: Built into the editor, accessible, no prompting skills needed, brand suggestions Cons: Basic for complex email types, less sophisticated than dedicated AI tools

6. ActiveCampaign

Best for: AI-generated content within automation workflows

ActiveCampaign's AI content generator works within the automation builder and campaign editor. Generate email content, subject lines, and automation messages with context from the workflow (trigger, audience segment, automation goal). The AI considers where the email fits in the customer journey.

The workflow context makes ActiveCampaign's AI more useful than standalone tools for automation emails. When generating content for step 3 of a 5-email onboarding sequence, the AI considers what the previous emails covered.

Best for: Automation email content, workflow-aware generation, journey context Pricing: From $29/month Pros: Workflow-aware AI, automation context, CRM data available, broad feature set Cons: AI quality is supplementary, higher tiers for full AI features

7. Klaviyo

Best for: AI copywriting for e-commerce emails

Klaviyo's AI generates email content optimized for e-commerce: product announcements, promotional campaigns, abandoned cart sequences, and post-purchase follow-ups. The AI has access to your product catalog and customer data, so it can reference specific products and personalize recommendations.

For e-commerce businesses, having AI that understands your products and customers produces more relevant email content than a generic AI tool. Product launch emails reference actual product details, and promotional emails can dynamically recommend products.

Best for: E-commerce email copy, product-aware content, promotional campaigns Pricing: Free up to 250 contacts, from $20/month Pros: Product catalog awareness, e-commerce-optimized, personalized recommendations Cons: E-commerce-focused, less useful for SaaS, pricing scales with contacts

How to Get the Best Results From AI Email Copywriting

Give Context, Get Quality

The number one factor in AI email quality is context. Always provide:

Who you are: Product description, value proposition, brand voice
Who you're writing to: Target audience, their pain points, their knowledge level
What you want: The goal of this email, the desired action, the key message
Constraints: Word count, tone (casual/professional), specific things to include or avoid

Edit, Don't Just Generate

AI-generated email copy is a first draft. Always:

Remove generic filler phrases ("In today's fast-paced world...")
Add specific details about your product
Check that the CTA is clear and specific
Verify any claims or statistics the AI generated
Read it aloud. Does it sound like you, or like a marketing robot?

Build a Prompt Library

Create reusable prompts for common email types:

Welcome email prompt (with brand context and onboarding steps)
Feature announcement prompt (with product details and benefits framework)
Re-engagement prompt (with common reasons users disengage)
Dunning prompt (with payment failure context and recovery steps)

Reuse these prompts with updated specifics each time. Consistency in prompting produces consistency in output.

Use AI for Variants

AI is excellent for generating multiple versions of the same email. Write one email manually, then use AI to create 5 variations for A/B testing. This gives you the quality of human writing with the quantity of AI generation.

How to Choose

Maximum flexibility for any email type: ChatGPT/Claude. Best understanding of context, iterative refinement, free tier available.

Marketing team with brand consistency needs: Jasper. Brand voice training with email-specific templates.

Quick batch generation for testing: Copy.ai. Fast multiple variants with workflow chaining.

SaaS lifecycle sequence generation: Sequenzy. Full sequences generated with brand and SaaS context.

Non-technical users needing in-editor AI: Mailchimp. Most accessible AI copywriting.

AI content within automations: ActiveCampaign. Workflow-aware content generation.

E-commerce email copy: Klaviyo. Product-aware content with catalog integration.

FAQ

Should I use a standalone AI tool or built-in AI? Both. Use built-in AI for quick generation while building campaigns. Use standalone tools (ChatGPT/Claude) for strategic planning, sequence design, and complex writing tasks. The built-in tools are faster for everyday use. Standalone tools are better for important, high-stakes emails.

How much should I edit AI-generated email copy? For high-volume operational emails (transactional, notifications), minimal editing is usually fine. For marketing campaigns and lifecycle sequences, expect to edit 30-50% of the content. For critical emails (pricing changes, major announcements), use AI for brainstorming but write the final version yourself.

Can AI match my brand voice? With enough context and examples, yes. The best approach is to provide 3-5 example emails in your voice and ask the AI to match the style. Built-in tools that read your website (like Sequenzy) do this automatically. Standalone tools need manual context.

Will AI-generated emails hurt deliverability? No. Email deliverability is based on sending infrastructure, engagement rates, and sender reputation. The content of the email (AI or human-written) doesn't affect deliverability unless it contains spam trigger words, which well-prompted AI generally avoids.