Litmus vs MailSlurp
Litmus
litmus.com
MailSlurp
mailslurp.comSide by side
| Figure | Litmus | MailSlurp |
|---|---|---|
| Price from | $79/mo | $19.99/mo |
| Free plan | — | Yes |
| Free trial | Yes | Yes |
| Open source | — | — |
| Web | Yes | Yes |
| iOS | — | Yes |
| Android | — | Yes |
| API | Yes | Yes |
| Plans published | 7 | 9 |
| Spec score · Email Testing Software | 8.9 (#4) | 8.9 (#5) |
| Company legal name | Crunchbase lists the legal name as Litmus Software, Inc. | The legal entity is Pettman OÜ, registered at Rännaku pst 12, Tallinn, Estonia. |
| 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. | MailSlurp states GDPR compliance, AWS data-center ISO 27001 and SOC 2 standards, PCI DSS payment handling through Stripe, OWASP practices and NIST framework alignment. |
| Headquarters | Boston, Massachusetts, United States | Saue, Harjumaa, Estonia |
| Integrations | Integrations cover ESPs, code editors, Slack, Trello, Dropbox, Google Drive, OneDrive, Salesforce Marketing Cloud, Marketo, and other martech tools. | The integrations directory lists 79 items, including SDKs, Playwright, Cypress, Selenium, BrowserStack, Zapier, Power Automate, UiPath, Postman, GraphQL and webhooks. |
| Licence | Litmus is proprietary hosted software; its terms describe subscription services and copyright-protected software and content. | The hosted MailSlurp service is proprietary, while public official SDK repositories such as the TypeScript client are MIT licensed. |
| Product | Litmus describes itself as an AI-native platform for the email workflow, including building, testing, monitoring, and campaign insights. | MailSlurp provides tools to build, test, and automate email and SMS workflows. |
| Rating on GetApp | 4.6 out of 5 from 53 reviews | 0 out of 5 from 0 reviews |
| Rating on Trustpilot | 2.5 out of 5 from 8 reviews | 3.1 out of 5 from 15 reviews |
| Rating on TrustRadius | 8.6 out of 10 from 652 reviews and ratings | 0 out of 10 from 0 reviews and ratings |
| Security | The Validity Trust Center lists Litmus security materials including its Security White Paper and SOC 2 Type 2 report. | The security policy says data at rest is encrypted with AES-256, data in transit uses TLS/SSL, and daily backups are stored in AWS S3. |
| Support | Litmus directs customers to its Help Center and support team for product guidance and assistance. | The support page offers guides and direct contact for account, billing, delivery, and technical issues. |
| What it does | Litmus is a web-based email development and optimization platform for building, previewing, testing, tracking, and reviewing campaigns. | MailSlurp provides programmable email addresses, phone numbers, messaging APIs and testing workflows for developers and QA teams. |
Plans
Litmus
- Litmus Basic$99 a month
- Litmus Plus$199 a month
- Litmus Core$500 a month
- Litmus Basic yearly$79 a month
- Litmus Basic monthly$99 a month
- Litmus Core yearly$417 a month
- Litmus Core monthly$500 a month
MailSlurp
- FreeFree
- FreeFree
- Starter$19.99 a month
- Starter$19.99 a month
- Pro$49.99 a month
- Pro$49.99 a month
- Growth$129.99 a month
- Growth$129.99 a month
- EnterprisePriced on request
In their own words
Litmus
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.
MailSlurp
MailSlurp provides tools to build, test, and automate email and SMS workflows. Users can create temporary or permanent inboxes and handle messages through APIs, SDKs, SMTP, IMAP, and webhooks. It supports end-to-end tests for scenarios including OTP, MFA, magic links, and load testing, as well as device previews, email audits, and inbox placement checks. Pipelines can route messages and attachments using webhooks, forwarding, and automatic replies. AI extraction can turn emails and attachments such as PDFs and images into structured JSON using prompts, schemas, and OCR. Listed integrations include Playwright, Cypress, Selenium, HubSpot, Braze, Mailchimp, Zapier, and AI assistants through MCP. A REST API and official SDKs cover several programming languages. The free plan has capped allowances, including 500 received emails and 1,000 sandbox sends per month. Starter costs $19.99/mo; custom domains and phone numbers require Pro on Free and Starter plans. MailSlurp is web- and API-accessible.