Litmus

Litmus is the long-standing standard for previewing how a marketing or transactional email actually renders across Gmail, Outlook, Apple Mail, mobile clients, and dark-mode variants. Pre-send checklist catches broken links, missing alt text, spam triggers, image weight, and load time. Build, Proof, and Analytics modules cover authoring, review, and post-send heatmaps.

Growth work lives or dies on targeting and measurement. What matters is whether behavioral triggers can be built without engineering time, whether the event stream supports attribution past the open, and whether deliverability holds when broadcast volume shares a reputation with product email.

Against behavior-triggered journeys, broadcasts, and winback campaigns measured on revenue, Litmus covers multi-tenant support, and does not cover scheduling, event stream, and the suppressions API. Whether that gap matters depends on how central those are to the build.

• Scheduling: No
• Event stream: No
• Deliverability: Not applicable; preview and QA, not a sender.
• Operating since: Not published
• Suppressions API: No
• Best published rate per 1,000: Tiers not published in comparable form
• Multi-tenant: Yes
• Free tier: 7-day free trial; no permanent free tier on the main paid plans
• Starts at: Basic plan listed on the public pricing page; exact figure varies by region and is sales-driven on higher tiers

Not applicable; preview and QA, not a sender.

Marketing and lifecycle teams that need pixel-accurate previews across every major client before sending.

Solo developers sending only plain-text or simple transactional email.