Litmus vs Sendlens

Litmus is an email workflow platform for building, testing, monitoring, and analyzing campaigns. Teams can preview emails across more than 100 email clients and devices, while Litmus Test automates pre-send quality checks. Its extension can validate links, images, and tracking. Email Guardian monitors deployed emails around the clock and alerts users to issues such as failing links and broken renders. Litmus Builder offers code and visual editors; emails can start from templates, be created from scratch, or be imported from cloud storage. Listed integrations include Salesforce Marketing Cloud, Mailchimp, Marketo, Eloqua, HubSpot, Klaviyo, Slack, Trello, and cloud storage. Some integrations require Plus or Enterprise, and ESP Sync availability depends on the plan and supported provider. REST APIs are available for Email Previews and Email Analytics, with access evaluated case by case. Litmus offers web, extension, and API access. Monthly prices listed are $99 a month for Basic, $199 a month for Plus, and $500 a month for Core. There is no free plan, but a 7-day trial is available.

Sendlens is a web-based email campaign intelligence platform that analyzes performance beyond the reporting provided by email service providers. It captures campaign screenshots and scores them across more than 15 fields, including content, visuals, calls to action, layout, tone, palette, and spam signals. It relates those traits to open rate, open-to-click rate, and conversion data, then ranks patterns by statistical confidence. Similar campaigns can be clustered for comparison with aggregated metrics; users can rename, recolor, or manually assign campaigns. Automation emails are grouped under their parent flow with totals and per-step breakdowns. Conversion data can be uploaded as a CSV for attribution funnels, using a configurable seven-day default window; attribution is a Pro feature. ActiveCampaign and Brevo are live integrations, while Klaviyo, Mailchimp, and Kit are listed as coming next. Campaign and flow performance can be exported to CSV for use with Sheets, Looker, and PowerBI. The free plan includes ten one-time fingerprint credits. Essentials costs €29 a month, billed monthly; Pro costs €69 a month, billed monthly.