Litmus is the leading email testing and analytics platform, enabling email marketing teams to preview how their emails render across 100+ email clients and devices, test spam filter performance, validate links and images, and track post-send engagement analytics — ensuring every email looks and performs exactly as intended before reaching recipients.
Product Overview
Litmus is the industry standard tool for email quality assurance: before a campaign goes to hundreds of thousands of subscribers, Litmus allows teams to render a preview of how that exact email will appear in Gmail on Chrome, Outlook 2019 on Windows, Apple Mail on iPhone 15, Samsung Mail on Android, and 90+ other combinations — in seconds. This pre-send testing prevents the rendering failures that cause emails to display broken images, collapsed layouts, or unreadable text in specific clients — problems that are invisible when testing from a single inbox but affect significant portions of the recipient list. Litmus's Spam Testing analyses the email against major spam filters and provides a deliverability score with recommendations. Its Link Validation checks every link in the email for broken URLs before sending. Litmus Analytics provides post-send engagement data including open rates by email client, read time, and dark mode usage — giving teams the data to optimise templates for their specific audience.
Key Features
- Email Previews (100+ Clients): Render the exact email across 100+ email client and device combinations — identify display issues before they reach subscribers.
- Spam Testing: Test against major spam filters and generate a deliverability score — identify content and technical factors triggering spam classification.
- Link Validation: Check every link in the email for broken URLs before sending — prevent dead links from damaging the subscriber experience.
- Email Analytics: Post-send engagement data including open rate by email client, read time, and dark mode usage — optimise templates based on real audience data.
- Code Editor & Checklist: Built-in HTML editor with pre-send checklist — fix issues and preview changes without leaving the platform.
Best For
Email marketing teams at mid-market and enterprise companies that send regular campaigns to large subscriber lists and need to guarantee rendering quality across all email client environments before every send.
Pricing
Basic: $99/month. Plus: $199/month. Enterprise: custom. Free trial available.
Key Integrations
Mailchimp, Salesforce Marketing Cloud, HubSpot, Klaviyo, Marketo, Campaign Monitor, Braze, Iterable, ActiveCampaign, Constant Contact
Pros
- 100+ email client previews — most comprehensive rendering coverage in the market
- Industry-standard tool — virtually every major ESP has a native Litmus integration
- Post-send analytics by email client reveal where your audience actually reads email
- Prevents rendering failures that damage brand perception with large subscriber segments
Cons
- Pricing is high for small teams or low-volume senders who send infrequent campaigns
- Focused on rendering and deliverability — not a warmup or reputation-building tool
- Some email client previews use simulated renders rather than real client rendering
