Ever watched a marketing team work through an email campaign? The endless tweaking, second-guessing, and "does this sound right?" questions can burn through an entire workday. That's where AI marketing generators come in, creating actual content powered by natural language processing. More than 80% of marketers now use AI features, with B2B teams reclaiming a full workday every week.
Let's peek behind the curtain at four leading AI email tools, all tested with the exact same campaign scenario.
The test scenario
Each AI tool faced the same practical challenge: craft an email promoting a new product launch to warm leads. The ingredients provided were identical:
- Product name
- Three key benefits
- Target audience persona
- Brand tone (professional but enthusiastic)
The judgment criteria? Copy quality, tone accuracy, customization options, and integration potential — the nuts and bolts of real campaign work.
Tool-by-tool comparison
1. Superhuman: speed-focused email intelligence
Superhuman creates context-aware copy right in your inbox through features like Write with AI, Rewrite in Your Voice, and Instant Reply. Rather than generic suggestions, it analyzes messages you've sent to specific people and matches your natural communication style with them. The tool gets smarter as you use it and continues to evolve with new AI advancements.
Example output: "Big news — we're launching [Product Name], designed to help fast-moving teams work even faster. Get early access and discover how [key benefit 1], [benefit 2], and [benefit 3] are changing the game." [CTA: Request Early Access]
Strengths:
- Action-oriented copy that actually sounds like a human wrote it
- Context-aware suggestions that fit the conversation
- Built-in tools for quick sending and follow-ups
- Direct integration with Gmail/Outlook
Teams using Superhuman respond to twice as many emails in the same amount of time, with AI features saving 37% more time. It works best for professionals who need to draft, send, and track campaigns without tab-hopping.
Try Superhuman2. Jasper: content marketer's AI companion
Jasper focuses on robust copy generation with adjustable tone settings, templates, and dynamic content generation for long-form content, drip sequences, and A/B testing variants.
Example output: "Introducing [Product Name] — a breakthrough tool built to [benefit 1]. Join early adopters and see how it transforms [use case]. Click below to learn more."
Strengths:
- Strong copy generation with adjustable tone settings
- Excels at creating long-form or multi-step campaigns
- Requires an external email platform for deployment
Jasper works best for content marketers and growth teams who need scalable, quality copy across multiple campaigns.
3. Copy.ai: quick ideas when you need them
Copy.ai offers a straightforward interface for generating ideas, subject lines, and short-form email copy on demand.
Example output: "Say hello to [Product Name]! Built to [benefit 1], [benefit 2], and more. Join our beta list now — spaces are limited!"
Strengths:
- Quick brainstorming when facing the blank page terror
- Particularly good for subject lines and lightweight copy
- Less focused on campaign execution flow
This tool works especially well for early-stage founders and freelancers who need fast copy support without complicated workflows.
4. Mailchimp + AI content assistant: the integrated approach
Mailchimp's AI Content Generator sits directly within their campaign builder, offering GPT-powered copy generation, subject line suggestions, and content optimization.
Example output: "[Product Name] is here! Don't miss your chance to see how it can [benefit 1] and support your team's success. Sign up today."
Strengths:
- Integrated directly into campaign deployment
- Straightforward for standard marketing emails
- More limited in tone and structure flexibility
Small teams already using Mailchimp for campaign deployment will find this most useful as it keeps everything in one ecosystem.
Key takeaways
Superhuman stands out for campaign execution speed, consistent voice matching, and built-in prioritization tools. Users reply to twice as many emails in the same timeframe and save 37% more time with its AI features.
Jasper excels in deeper AI capabilities for content-focused marketing teams, offering versatile copy generation with adjustable tones.
Copy.ai shines at quick ideation and compelling subject lines, perfect for founders and freelancers who need ideas fast.
Mailchimp handles simple, templated campaigns with minimal friction, working best for small teams already using their platform.
Leading companies are 3x more likely to see significant productivity gains from AI, and top performers integrate AI tools into their workflow 5+ times daily.
Which tool is right for you?
The right AI tool can dramatically boost campaign performance, but finding the perfect match depends on your specific workflow needs.
Teams that need more than just drafting — those who execute campaigns, follow up with leads, and track performance — might find Superhuman offers a complete solution directly from the inbox. It functions as both email client and marketing tool in one seamless experience, including on mobile devices.
Data shows teams using Superhuman save 4 hours per person weekly, respond 12 hours faster, and handle twice as many emails in the same time. The result? An inbox that feels lighter and workflows that just work.
Take a moment to examine your current email marketing process. Whether you're looking for better copy, faster campaign deployment, or simply more time in your day, an AI email marketing generator might be the upgrade your workflow needs.
