Start from the email you actually send
Receive the message in MailSlurp, send it to a render address, paste the HTML, or upload an exported .eml file from your ESP.
The Litmus alternative for faster, complete email QA
Catch costly email mistakes before customers do. Review the final delivered message across supported Gmail, Outlook, Apple, mobile, desktop, light mode, and dark mode targets, then share one result and approve campaigns faster.
Trusted by email, CRM, QA, and development teams worldwide
Preview the final delivered email, not just the template
Send a campaign test, open an email already received by MailSlurp, paste HTML, or import an .eml file. Then compare the result across the Gmail, Outlook, Apple Mail, mobile, desktop, light mode, and dark mode targets your customers use.
Choose the clients that matter
Select supported webmail, desktop, mobile, and dark mode targets, then save repeatable profiles for future reviews.
Compare differences side by side
Inspect screenshots together to catch spacing, image, CTA, responsive, and dark mode defects before approval.
Catch expensive email mistakes before customers do
Review the final delivered message for visual, content, accessibility, and delivery problems before your team approves an important send.
Look right in every important inbox
Catch layout and responsive problems across supported Outlook, Gmail, Apple, mobile, desktop, light mode, and dark mode targets.
Find broken images, links, and CTAs
Inspect the delivered message before a missing asset, broken destination, or content warning reaches customers.
Catch dark mode and accessibility problems
Review contrast, hidden content, unsupported markup, and readability across the contexts your customers use.
See inbox and spam outcomes
Pair visual approval with inbox placement and sender-health evidence before an important campaign reaches your audience.
Simple pricing
Choose flexible usage-based pricing or reserve predictable preview volume with a prepaid subscription.
Usage-based pricing
Pay for the preview volume you use and scale up or down as campaign demand changes.
Prepaid subscription
Reserve predictable monthly preview capacity in a package shaped around your team.
Automate repeatable email QA when your team is ready
Marketing teams can keep using the dashboard and their existing ESP workflow. Use render addresses, APIs, and CI only where automation saves time or protects a critical email.
Render address and .eml workflows
Send the final ESP email to a render address or import an exported .eml file without rebuilding the campaign in another tool.
API-triggered previews
Start preview runs from campaign tooling, release checks, or your own application when a manual step no longer makes sense.
Automated delivered-message checks
Wait for the final message and verify its sender, subject, body, links, attachments, and other customer-visible content.
CI for release-critical email
Connect Playwright, Cypress, Selenium, Postman, or an existing test suite when a broken transactional email should stop a release.
Frequently asked questions
See how MailSlurp supports client coverage, campaign review, migration, flexible pricing, and optional automation.
Is MailSlurp a Litmus alternative for developers and QA teams?
Yes. MailSlurp combines real-client email previews with content and link audits, inbox placement, sender monitoring, and a repeatable review workflow. Developers and QA teams can also add programmable inboxes, delivered-message assertions, OTP and password-reset testing, and API automation when needed. Compare Litmus pricing Compare Litmus with Email on Acid
Does MailSlurp support the email clients my team tests in Litmus?
MailSlurp supports major mailbox and device targets including Gmail, Yahoo, Outlook.com, Outlook Classic, Outlook New, iPhone, Android, desktop, mobile, light mode, and dark mode contexts. Client catalogs change over time, so check your most important targets in the current selector. See device preview coverage
Can I migrate an automated Litmus testing workflow to MailSlurp?
Yes. Start from a delivered message, a render address, HTML, or an exported .eml file, then trigger previews and message assertions through REST APIs and official SDKs. Teams can move one campaign or product-email workflow first and expand after the results match their release requirements. Read the device render documentation
Is MailSlurp fast and reliable for automated email tests?
MailSlurp provides isolated inboxes and deterministic wait APIs so tests can wait for the correct message instead of relying on shared mailboxes or fixed sleeps. Service availability is published on the status page, and enterprise plans can include documented support and availability commitments. View service status Review the MailSlurp SLA
Is MailSlurp pricing flexible for teams moving from Litmus?
Yes. You can start free, then ask MailSlurp for a package covering your preview demand, inbox testing, automation, team access, support, and enterprise requirements. Share your current usage and quote so the package covers everything your team needs. Talk to sales
Test MailSlurp with one of your own emails
Send a campaign or transactional email, preview it across supported clients, and check its inbox placement, content, links, and delivered result.