Tool profile
Litmus: cost, fit and limits
Litmus is an email testing and building suite from Litmus Software, Inc., now part of Validity Engage, that combines Litmus Builder for coding emails with client previews, dark mode checks and a design library for email teams.
What to know first
Litmus publishes no prices, and its pricing link opens a contact-sales page. Litmus Builder lets a team create and preview personalized emails with ESP-specific merge tags, save sections as reusable modules and sync emails to HubSpot. Previews list supported clients and devices. The AI page points to Validity Engage and does not name a template generator, and the hosting region and security certifications were not stated on the pages read.
Litmus at a glance
| Maker | Litmus Software, Inc., United States |
|---|---|
| Free plan | No |
| Entry price | Quote only |
| API access | No |
| Category | Best AI Email Template Builders in 2026, rank 10 of 12 |
| Website | litmus.com |
Who Litmus is best for
Email developers who test constantly
Client previews with a published list of supported clients and devices sit beside the builder, so rendering checks happen where the code is written.
Teams reusing code sections
Save as Module stores a code section in the Design Library, and the same library can feed later emails so recurring blocks are built once.
HubSpot users
Litmus Builder can sync emails to HubSpot, and the integrations list names ESPs including Mailchimp, Klaviyo and Campaign Monitor as well.
Litmus plans and pricing
| Plan | Price | What it includes |
|---|---|---|
| Contact sales | Quote only | Litmus Builder, email testing, previews and deliverability tools; plans are discussed with sales on the contact-sales page. |
Checked November 2026.
What Litmus does
- Litmus Builder
- Emails are created and previewed with ESP-specific merge tags, so a developer sees personalization placeholders in the format the sending platform expects. The product page presents this as the main reason to use Builder over a generic code editor.
- Save as Module
- A code section can be saved to the Design Library as a module, which gives teams a shared set of reusable parts for headers, footers and calls to action.
- Dark mode check
- Litmus Builder includes a check for the code elements that dark mode needs, which is a common cause of unreadable emails in some clients. Teams still need to view real previews to confirm that colors invert as intended.
- HubSpot sync
- Emails built in Litmus Builder can be synced to HubSpot, and the integrations page lists several other ESPs for export or testing. Other ESPs are listed by name on the product page, though the sync route for each was not detailed.
- Client previews
- A list of supported email clients and devices accompanies the previews, giving a buyer a way to confirm that the clients they care about are covered.
How Litmus handles your data
The privacy page and terms name Litmus Software, Inc., and the site says Litmus is part of Validity Engage. The pages read do not say whether email content is used to train models, give no retention period, name no hosting region and list no security certification. The AI and Emerging Email Technologies page points to Validity Engage and does not describe how customer content is handled by AI. Ask for Litmus's data processing terms and sub-processor list when previews or tests will contain unreleased campaign content.
Where Litmus falls short in practice
- No public pricing. The pricing link leads to a contact-sales page, so a team cannot compare cost with self-serve builders or estimate a monthly budget from the site.
- Part of a larger suite. The site says Litmus is part of Validity Engage, and the AI page defers to that platform, so buyers should confirm which product they are buying and what it includes.
- No named AI template generation. The AI page names no template generation or copywriting feature, so teams that want generated layouts will need another tool. The page instead directs readers to Validity Engage for AI capabilities.
Works with
Alternatives to Litmus
Litmus: common questions
How much does Litmus cost?
No prices appear on the pages read. The Pricing link leads to a contact-sales page, so Litmus quotes by conversation. Ask what the plan covers: builder, previews, deliverability tools or all three, because the contact-sales page groups them together. The same page lists no plan names.
Is Litmus part of Validity?
Yes. The site says Litmus is part of Validity Engage, and the AI and Emerging Email Technologies page says Litmus capabilities are now part of that platform, which the site calls AI-powered. Confirm the current packaging with sales. Whether pricing is bundled with other Validity products was not stated.
Does Litmus Builder work with HubSpot?
Yes, the product page says emails can be synced from Litmus Builder to HubSpot. The integrations list also names Mailchimp, Klaviyo, Campaign Monitor, Oracle Eloqua, Adobe Marketo, Adobe Journey Optimizer and Acoustic Campaign. Check whether your ESP sync is one-way or two-way.
Can Litmus check dark mode?
Litmus Builder includes a dark mode check that looks at the code elements dark mode needs. The product page also lists email client previews with the supported clients and devices, so the check can be combined with rendering tests. The check does not replace testing in real clients.
Does Litmus generate emails with AI?
No template generation feature is named on the pages read. The AI and Emerging Email Technologies page links to Validity Engage, which the site describes as an AI-powered platform. Ask the vendor which AI features come with a Litmus plan. Litmus has no free plan on the pages read.