Campaign Monitor
Why choose it: Brands and agencies that prioritize polished email design plus lifecycle and transactional messaging.

Email previews, testing and collaboration for email teams.
#4 of 5 in Email Testing by Overall Score
Litmus is now part of Validity Engage, an email platform for building, previewing and testing emails before send, with previews across 100+ email clients and devices.
Validity Engage, formerly Litmus, sits in the quality-assurance stage before a campaign is sent. Its workflow centers on previews, checks, review, and testing across email environments, helping teams catch rendering or content issues while the actual subscriber database and campaign delivery remain in a separate ESP or marketing platform.
Calculated from facts we verified on Validity Engage (formerly Litmus)'s own website, using published thresholds. Nobody can pay to change it. Together with Market Signal it makes the Overall Score of 48 that orders our lists.
Dimensions without verified data count as a neutral 2.5. Facts checked October 14, 2026. How the rating works
Computed from Ahrefs + Semrush data about Validity Engage (formerly Litmus)'s own website. Not an assessment of the product itself. How this works →
Market Strength
50
Where it stands today
Momentum
58 Cooling ↓
Where it’s heading
Data Confidence
High
How much to trust it
Tick mark = category average.
Compared with 42 tracked Email Marketing tools. Data through September 2026, pulled October 6, 2026.
| Plan | Monthly | Annual (mo) |
|---|---|---|
| Enterprise | Custom | Custom |
Pricing shown reflects list prices as of our last check and may have changed. Confirm current pricing on Validity Engage (formerly Litmus)'s website before purchasing.
Mailchimp, Campaign Monitor, HubSpot, Salesforce Marketing Cloud, Marketo, Oracle Eloqua
Help center, Phone, Community forum, Email
Why choose it: Brands and agencies that prioritize polished email design plus lifecycle and transactional messaging.
Why choose it: Email teams and agencies that want collaborative design, brand governance, approvals, and export into an existing sending platform.
Why choose it: Email senders diagnosing why messages land in spam.
Why choose it: Email design and lifecycle teams that need strict brand consistency, reusable modules, and structured stakeholder approval.
Why choose it: Lifecycle and enterprise email teams managing reusable designs, approvals, localization, and multiple sending platforms.
Validity Engage (formerly Litmus) doesn't currently offer a free plan or free trial.
Validity Engage (formerly Litmus) uses custom/quote-based pricing. Contact the vendor directly for a quote.
Commonly considered alternatives include Campaign Monitor, RGE Studio (formerly BEE Free), GlockApps, Chamaileon and Dyspatch. The Alternatives section on this page shows what each one is best at and its starting price.