Litmus
Litmus is an email workflow platform for teams building, testing, monitoring, and analyzing campaigns.
What Litmus is
Litmus is an email workflow platform for teams building, testing, monitoring, and analyzing campaigns. Its preview and testing tools cover more than 100 email clients and devices, while Litmus Test automates pre-send quality checks. The browser extension can check links, images, and tracking. After sending, Email Guardian monitors deployed emails around the clock and alerts users to issues such as failed links or broken rendering. Litmus Builder offers code and visual editors, with options to start from templates, build from scratch, or import from cloud storage. Listed integrations include email services such as Salesforce Marketing Cloud, Mailchimp, Marketo, Eloqua, HubSpot, and Klaviyo, as well as Slack, Trello, and cloud storage. Some integrations require Plus or Enterprise, and ESP Sync depends on the plan and supported provider. Litmus also offers REST APIs for previews and analytics, with access evaluated case by case. Paid plans have no free plan; a 7-day trial is available. Monthly options listed include Basic at $99 a month, Plus at $199 a month, and Core at $500 a month.
Good
- Previews emails across 100+ clients and devices
- Automates pre-send QA checks
- Monitors deployed emails around the clock
- Includes code and visual email editors
- Offers spam, accessibility, and link checks
Watch out
- No free plan
- Some integrations require Plus or Enterprise
- API access is evaluated case by case
Who it suits
Litmus suits marketers and email teams that need to build, quality-check, monitor, or analyze campaigns across many clients and devices. Teams should check plan requirements for integrations and API access before choosing it.
Verdict
Litmus combines email building, pre-send checks, broad client previews, and post-send monitoring in one workflow. Its paid plans and plan-dependent integrations make it important to confirm access needs before signing up.
Plans and prices
From Litmus's own pricing page, checked 2 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| Litmus Basic | $99 a month | 1 full user · unlimited read-only users · 1,000 Email Previews in 100+ clients and devices · Monthly; the page also lists a yearly option at $79 USD per month, saving $240 yearly. |
| Litmus Plus | $199 a month | For email teams of 2–3 people · Monthly; the page advertises a 7-day free trial. |
| Litmus Core | $500 a month | 5 full users · 2,000 Email Previews/month · 500,000 analytics opens/month · 50,000 Personalize impressions/month · Monthly; the page also lists a yearly option at $417 USD per month, saving $1,000 yearly. |
| Litmus Basic yearly | $79 a month | 1 full user · unlimited read-only users · 1,000 previews · 100+ clients/devices · Email Guardian · Design Library · Litmus Test · productivity integrations · per month, billed yearly |
| Litmus Basic monthly | $99 a month | 1 full user · unlimited read-only users · 1,000 previews · 100+ clients/devices · Email Guardian · Design Library · Litmus Test · productivity integrations · per month |
| Litmus Core yearly | $417 a month | 5 full users · 2,000 previews/month · 500,000 analytics opens/month · 50,000 Personalize impressions/month · automated QA · 100+ clients/devices · builder · testing profiles · code-editor integrations · Mailchimp and Klaviyo integrations · per month, billed yearly |
| Litmus Core monthly | $500 a month | 5 full users · 2,000 previews/month · 500,000 analytics opens/month · 50,000 Personalize impressions/month · automated QA · 100+ clients/devices · builder · testing profiles · code-editor integrations · Mailchimp and Klaviyo integrations · per month |
The facts
Each one read from Litmus's own pages, with the date it was checked.
What it does
- Acquisition news
- Validity announced completion of its Litmus acquisition on April 10, 2025; financial terms were not disclosed.checked 15 Oct 2026
- Analytics
- Email Analytics reports engagement details including opens, read time, deletion, glances, skims, and geolocation.checked 15 Oct 2026
- API
- Litmus offers REST-based APIs for Email Previews and Email Analytics, with access evaluated case by case.checked 2 Oct 2026
- API access
- API access is evaluated case by case and prospective users are directed to contact Litmus partners support.checked 15 Oct 2026
- Builder
- Litmus Builder supports code and visual editors, and emails can be created from templates, from scratch, or imported from cloud storage.checked 2 Oct 2026
- Chrome extension
- The Chrome extension previews, personalizes, troubleshoots, and tests emails from local editors or ESP editors.checked 15 Oct 2026
- Collaboration
- Users can share proofs, collect comments and approvals, and collaborate with stakeholders on rendered email versions.checked 15 Oct 2026
- Compliance
- The Trust Center states that the Litmus SaaS product is included in Validity’s ISO certification and reports that Litmus’s annual SOC 2 Type II audit completed with no exceptions.checked 2 Oct 2026
- Documentation
- The help center documents previews, client differences, integrations, browser support, accessibility, spam testing, security, and troubleshooting.checked 15 Oct 2026
- Email builder
- The product includes HTML and visual editors for creating on-brand emails with or without coding.checked 15 Oct 2026
- Email Guardian
- Email Guardian provides unlimited 24/7 monitoring and alerts when client changes may break an email.checked 15 Oct 2026
- Email monitoring
- Email Guardian monitors deployed emails around the clock and alerts users to issues such as failing links and broken renders.checked 2 Oct 2026
- Email previews
- Litmus previews emails across more than 100 popular email clients and devices, including dark mode.checked 15 Oct 2026
- Extension limitation
- The extension is free to download but full pre-send testing and personalization require a paid Litmus account, and it is currently Chrome-only.checked 15 Oct 2026
- Instant API
- The Instant API accepts email content by POST and returns client previews through GET requests, with HTTPS endpoints and Basic or OAuth authentication.checked 15 Oct 2026
- Integration limits
- The help documentation says some integrations require Plus or Enterprise, and ESP Sync availability depends on plan and supported provider.checked 2 Oct 2026
- Integrations
- Integrations cover ESPs, code editors, Slack, Trello, Dropbox, Google Drive, OneDrive, Salesforce Marketing Cloud, Marketo, and other martech tools.checked 15 Oct 2026
Where it runs
- Browser requirements
- The web app supports current stable desktop Safari, Chrome, Edge, and Firefox with JavaScript and cookies enabled; tablet and phone browsers are unsupported.checked 15 Oct 2026
The company
- Company facts
- LinkedIn lists Litmus as privately held, founded in 2005, headquartered in Cambridge, Massachusetts, with 51–200 employees.checked 15 Oct 2026
- Company legal name
- Crunchbase lists the legal name as Litmus Software, Inc.checked 15 Oct 2026
- Founded
- 2005checked 23 Sep 2026
- Funding and owner
- Crunchbase lists Spectrum Equity as the Series A investor and says Litmus was acquired by Validity.checked 15 Oct 2026
- Headquarters
- Boston, Massachusetts, United Stateschecked 23 Sep 2026
Money
- Free plan
- Nochecked 20 Sep 2026
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