How we evaluated AI email writer apps
This comparison is based on practical criteria that matter for daily email writing, not feature lists or marketing claims. We evaluated each app on five dimensions: output quality for common email types like follow-ups, client updates, and replies; speed from prompt to usable draft; ease of use without tutorials or documentation; mobile experience for on-the-go drafting; and pricing transparency.
We tested each app with the same set of email scenarios: a payment follow-up to a client, an internal project status update, a cold outreach email, a customer support reply to a complaint, and a meeting request to a new contact. This standardized testing reveals how each tool handles the range of emails professionals actually write.
No AI email app is universally best. Each has strengths and trade-offs. The right choice depends on your specific email volume, complexity, platform preferences, and budget.
FlyMail: email-first design for mobile and web
FlyMail is built specifically for email writing, not as a general AI tool adapted for email. This specialization shows in the workflow: you describe your email goal, add context, choose a tone, and get a draft. No prompt engineering required. The interface is designed for speed, with the entire generation process taking under 30 seconds from start to usable draft.
The web tool offers 3 free generations per day, enough for real testing. The mobile app for iOS and Android extends this with higher volume and is designed for the situations where email happens most frequently: after meetings, between calls, and during commutes.
Strengths: fast generation, email-specific interface, strong mobile experience, free web tier for testing. The output follows professional email conventions by default, which means less editing for business scenarios.
Limitations: focused exclusively on email, so it is not a substitute for general AI writing tools. Does not integrate directly with Gmail or Outlook, so you copy the generated draft to your email client. The generation model is GPT-4o-mini, which balances speed and quality but may produce slightly less nuanced output than larger models.
ChatGPT: general-purpose AI with email capability
ChatGPT is the most widely used AI tool and handles email writing as one of many tasks. The advantage is that many people already have a subscription for other purposes, making email writing an incremental use case with no additional cost. ChatGPT can produce high-quality email drafts when given detailed prompts.
The trade-off is that ChatGPT is not optimized for email workflows. You need to write more detailed prompts to get email-specific output. There is no tone selector, no email-specific interface, and no mobile workflow designed for quick drafting. Each email requires a new conversation or a carefully managed thread.
Strengths: high-quality output with detailed prompts, versatile for many other tasks, widely available, strong free tier. The latest models produce excellent email content when given sufficient context.
Limitations: requires more prompting effort per email, no email-specific features, not optimized for mobile email drafting, no integration with email clients. The interface is conversational rather than transactional, which adds steps to the email generation workflow.
Jasper: content platform with email features
Jasper is a comprehensive content creation platform that includes email writing among many content types. It offers templates for various email scenarios, brand voice settings, and team collaboration features. Jasper is designed for marketing teams and content-heavy organizations that need AI assistance across multiple content formats.
For email specifically, Jasper provides templates for sales emails, marketing campaigns, and business communication. The brand voice feature allows teams to maintain consistent tone across all communications. The team features support collaboration and approval workflows.
Strengths: brand voice consistency, team collaboration, templates for multiple email types, part of a broader content platform. Good for organizations that already use Jasper for other content.
Limitations: more expensive than email-specific tools, learning curve for the platform, overkill if you only need email assistance. The pricing starts at $39 per month, which is significantly more than email-focused alternatives. The breadth of features can be distracting when you just need a quick email draft.
Other notable AI email tools
Copy.ai offers a free tier with email templates and is good for marketing-focused email writing. The interface is clean and the output quality is solid for promotional and outreach emails. Less specialized for transactional business email.
Grammarly with its AI features provides email assistance within the context of a grammar and writing quality tool. If you already use Grammarly, the email generation features are a natural extension. The integration with email clients is a significant advantage over standalone tools.
MailMaestro and Flowrite are email-specific tools that integrate with Gmail and Outlook. They work within your email client rather than as separate applications, which reduces the copy-paste friction. Both are relatively new and may have smaller teams supporting them compared to larger platforms.
SuperHuman includes AI email features as part of its premium email client. If you are already a SuperHuman user, the AI features are well-integrated. However, SuperHuman subscription costs make it a significant investment for the email AI features alone.
Comparison table: features at a glance
When comparing tools, focus on the criteria that match your daily workflow. A freelancer who writes 5 client emails per day has different needs than a sales team sending 50 outreach emails per day. A mobile-first user needs different features than someone who works exclusively from a desktop.
The most common mistake in choosing an AI email tool is over-weighting the demo and under-weighting the daily workflow fit. A tool that produces the best single email in a demo but is slow or clunky to use daily will not save you time overall. The tool that produces good-enough emails quickly and consistently is usually the better practical choice.
Test at least two or three tools with your actual email scenarios before committing. Most tools offer free tiers or trials specifically for this evaluation process. Spend a week with each tool in your real workflow before deciding.
