Litmus
Litmus is an email marketing platform that allows you to build, test, and analyze high-performing email campaigns across dozens of popular email clients and devices to ensure perfect rendering.
Mailbutler
Mailbutler is an email productivity extension for Apple Mail, Gmail, and Outlook that provides tracking, scheduling, and signature management to help you handle your inbox more effectively.
Quick Comparison
| Feature | Litmus | Mailbutler |
|---|---|---|
| Website | litmus.io | mailbutler.io |
| Pricing Model | Subscription | Freemium |
| Starting Price | $99/month | Free |
| FREE Trial | ✓ 7 days free trial | ✓ 14 days free trial |
| Free Plan | ✘ No free plan | ✓ Has free plan |
| Product Demo | ✓ Request demo here | ✘ No product demo |
| Deployment | ||
| Integrations | ||
| Target Users | ||
| Target Industries | ||
| Customer Count | 0 | 0 |
| Founded Year | 2005 | 2015 |
| Headquarters | Boston, USA | Berlin, Germany |
Overview
Litmus
Litmus is an all-in-one email optimization platform designed to help you create flawless email experiences for every subscriber. You can build emails from scratch using a specialized code editor, or use visual tools to quickly assemble templates that work across all major platforms. The core strength lies in its automated testing, which lets you preview how your messages look in over 100 email clients and devices before you hit send.
Beyond just testing, you can use the platform to manage your entire email workflow, from collaborative reviews and approvals to advanced post-send analytics. It helps you identify broken links, missing alt text, and slow loading times that might hurt your engagement. Whether you are a solo marketer or part of a large enterprise team, the platform ensures your brand remains consistent and professional in every inbox.
Mailbutler
Mailbutler is an email extension that integrates directly into your existing inbox to help you manage communication more professionally. Instead of switching between different apps, you get advanced features like email tracking, send later, and professional signatures right inside Apple Mail, Gmail, or Outlook. It helps you stay organized by allowing you to attach private notes and tasks to specific emails so you never lose track of important follow-ups.
You can also use the built-in AI assistant to draft emails, summarize long threads, and improve your writing style instantly. The software is designed for freelancers, sales professionals, and small teams who need to maintain a high level of email productivity without leaving their preferred email client. It offers a 14-day free trial and a permanent free plan for basic needs.
Overview
Litmus Features
- Email Previews View your email exactly as it appears in 100+ email clients and devices to catch rendering issues instantly.
- Litmus Builder Write code and see live previews side-by-side, or use visual modules to build responsive emails faster.
- Spam Testing Scan your emails against major spam filters and blacklists to ensure your messages actually reach the inbox.
- Proof & Collaboration Share your email designs with stakeholders and collect centralized feedback directly on the preview to speed up approvals.
- Advanced Analytics Track how long subscribers spend reading your emails and which devices they use to better understand your audience.
- Link Monitoring Automatically verify that every link and image in your email works correctly so you never send a broken campaign.
Mailbutler Features
- Email Tracking. See exactly when and where your emails were opened and which links were clicked to time your follow-ups perfectly.
- Smart Send Later. Schedule your emails to be sent at specific times so they land at the top of your recipient's inbox.
- Professional Signatures. Create and manage beautiful, branded email signatures with ease to maintain a consistent professional image for your brand.
- Email AI Assistant. Draft replies, summarize long conversations, and fix spelling or grammar errors automatically using integrated artificial intelligence.
- Notes and Tasks. Attach private notes and actionable tasks directly to your emails so you remember every important detail and deadline.
- Message Templates. Save your most-used messages as templates to send personalized responses in seconds rather than typing them repeatedly.
Pricing Comparison
Litmus Pricing
- 1 user seat
- 1,000 email previews per month
- Unlimited Readability testing
- Basic spam testing
- Litmus Builder access
- Email community support
- Everything in Basic, plus:
- Up to 5 user seats
- 2,000 email previews per month
- Advanced spam testing
- Editor integrations (Slack, Trello)
- Litmus Proof collaboration tool
Mailbutler Pricing
- Basic email tracking
- Limited AI Assistant usage
- Email signatures
- Undo send functionality
- Attachment reminders
- Everything in Free, plus:
- Unlimited email tracking
- Real-time open notifications
- Link tracking details
- Tracking details dashboard
- Mobile app integration
Pros & Cons
Litmus
Pros
- Extensive device coverage for accurate email previews
- Intuitive code editor with real-time visual updates
- Streamlined feedback process for team approvals
- Reliable spam testing improves overall deliverability
- Detailed engagement analytics beyond standard open rates
Cons
- Starting price is high for small businesses
- Preview counts can be consumed quickly
- Steep learning curve for non-technical users
Mailbutler
Pros
- Integrates directly into your existing email client
- Excellent tracking accuracy for opens and clicks
- Very easy to set up and use immediately
- Professional signature templates look great on all devices
Cons
- Requires a browser or mail extension to function
- AI features require a higher-tier paid subscription
- Mobile functionality is more limited than desktop version