# Email on Acid vs MailSlurp

**Leader by vioscaleAI score:** Email on Acid

| Attribute | Email on Acid | MailSlurp |
|---|---|---|
| **vioscaleAI score** | 57.7 (64% (medium)) | 52.3 (54% (medium)) |
| content.faq | `[{"answer":"Tests email campaigns across 100+ email clients and devices to identify rendering issues, validate content for inbox compatibility, check accessibility compliance, and detect deliverability problems before sending. It is indexed under Email Testing Dev.","source":"https://www.emailonacid.com/pricing/","question":"What is Email on Acid?","confidence":0.6},{"answer":"Email on Acid is a paid product; published pricing starts at $0.15. It is sold across 3 plans (Basic, Premium and Custom). There is no free tier. Prices are published openly on the vendor's own pricing page. Pricing changes often, so verify at source before relying on it.","source":"https://www.emailonacid.com/pricing/","question":"How much does Email on Acid cost?","confidence":0.6},{"answer":"We have confirmed browser-based access to Email on Acid. That is the extent of what we could verify from public sources, so it may well offer desktop or mobile clients we have not indexed.","source":"https://www.emailonacid.com/pricing/","question":"What platforms does Email on Acid support?","confidence":0.6},{"answer":"We have only confirmed a cloud / SaaS deployment for Email on Acid, so it appears to be vendor-hosted. If a self-hosted option exists we have not found it documented publicly.","source":"https://www.emailonacid.com/pricing/","question":"Can Email on Acid be self-hosted?","confidence":0.6},{"answer":"We have independently confirmed SOC 2, ISO 27001 and GDPR for Email on Acid. Certifications we do not list are ones we have not been able to verify from public sources, which is not the same as Email on Acid not holding them. Always confirm compliance directly before you rely on it.","source":"https://www.emailonacid.com/blog/article/email-marketing/gdpr-compliance/","question":"What security certifications does Email on Acid have?","confidence":0.7},{"answer":"Email on Acid is available worldwide. Its primary market is the United States.","source":"https://www.emailonacid.com/pricing/","question":"Where is Email on Acid available?","confidence":0.5}]` | `[{"answer":"MailSlurp is an email and SMS testing platform providing ephemeral or permanent inboxes and phone numbers for developers to verify sign-ups, OTPs, and notification delivery. It includes email preview across multiple clients, deliverability tracking, and REST APIs for integration into automated test workflows. It is indexed under Email Testing Dev.","source":"https://www.mailslurp.com","question":"What is MailSlurp?","confidence":0.6},{"answer":"MailSlurp offers a free tier, so you can start without paying. Pricing changes often, so verify at source before relying on it.","source":"https://www.mailslurp.com/compare/sendgrid-pricing/","question":"Is MailSlurp free?","confidence":0.6},{"answer":"We have confirmed browser-based access to MailSlurp. That is the extent of what we could verify from public sources, so it may well offer desktop or mobile clients we have not indexed.","source":"https://www.mailslurp.com","question":"What platforms does MailSlurp support?","confidence":0.6},{"answer":"We have only confirmed a cloud / SaaS deployment for MailSlurp, so it appears to be vendor-hosted. If a self-hosted option exists we have not found it documented publicly.","source":"https://www.mailslurp.com","question":"Can MailSlurp be self-hosted?","confidence":0.6},{"answer":"We have confirmed 12 integrations for MailSlurp, including Zapier, Gmail, Outlook, Dropbox, Google Drive, Playwright, CypressJS and ACCELQ, plus 4 more. This is what we could verify from public sources, so the vendor may support others we have not indexed.","source":"https://www.mailslurp.com","question":"What does MailSlurp integrate with?","confidence":0.6},{"answer":"We have independently confirmed SOC 2 for MailSlurp. Certifications we do not list are ones we have not been able to verify from public sources, which is not the same as MailSlurp not holding them. Always confirm compliance directly before you rely on it.","source":"https://www.mailslurp.com","question":"What security certifications does MailSlurp have?","confidence":0.48}]` |
| deployment.options | `{"cloud":true}` | `{"cloud":true}` |
| description.long | Tests email campaigns across 100+ email clients and devices to identify rendering issues, validate content for inbox compatibility, check accessibility compliance, and detect deliverability problems before sending. | MailSlurp is a cloud-based service that allows developers to create test email addresses and phone numbers, preview emails on real devices, validate message delivery, extract data from messages, and build automated messaging workflows through REST APIs and SDKs. |
| features.capabilities | `{"open_source":false,"sms_testing":false,"api_assertions":true,"spam_score_check":true,"ci_cd_integration":false,"rendering_preview":true,"multi_user_inboxes":false,"production_sending_addon":false,"blocklist_deliverability_check":true}` | `{"open_source":false,"sms_testing":true,"api_assertions":true,"spam_score_check":true,"ci_cd_integration":true,"rendering_preview":true,"multi_user_inboxes":true,"production_sending_addon":true,"blocklist_deliverability_check":true}` |
| integrations.count | - | 8 |
| integrations.list | - | `[{"name":"Zapier"},{"name":"Gmail"},{"name":"Outlook"},{"name":"Dropbox"},{"name":"Google Drive"},{"name":"Playwright"},{"name":"CypressJS"},{"name":"ACCELQ"},{"name":"Mailchimp","native":true,"category":"email_marketing","direction":"inbound"},{"name":"Klaviyo","native":true,"category":"email_marketing","direction":"inbound"},{"name":"HubSpot","native":true,"category":"crm","direction":"inbound"},{"name":"Salesforce","native":true,"category":"crm","direction":"inbound"},{"name":"Cypress","native":true},{"name":"Selenium","native":true}]` |
| market.availability | `{"primaryMarkets":["US"],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` | - |
| platform.support | `{"web":true}` | `{"web":true}` |
| pricing | `{"type":"subscription","plans":[{"free":false,"name":"Basic","summary":"$99/month, $0.15 per preview overage","features":["1,000 email previews per month","100+ email preview clients and devices","Unlimited users","API access","Overage charges for additional previews"],"commitment":"monthly","components":[{"kind":"fixed","amount":99,"period":"month","currency":"USD"},{"per":{"qty":1,"unit":"preview"},"kind":"metered","amount":0.15,"currency":"USD"}],"description":"Email preview testing with API access","contactSales":false,"includedLimits":{"previews":"1,000/mo","clients_devices":"100+"}},{"free":false,"name":"Premium","summary":"$199/month","features":["2,000 email previews per month","100+ email preview clients and devices","Unlimited users","Accessibility tests (WCAG 2.2 / European Accessibility Act compliance)","HTML code analysis","Link and image validation","Spam content checks across major ISPs"],"commitment":"monthly","components":[{"kind":"fixed","amount":199,"period":"month","currency":"USD"}],"description":"Full QA suite with accessibility testing and content analysis","contactSales":false,"includedLimits":{"previews":"2,000/mo","clients_devices":"100+"}},{"free":false,"name":"Custom","summary":"Custom pricing","features":["Custom preview allotments","Phone and chat support","Dedicated support documentation"],"description":"Custom preview allotments and enterprise support","contactSales":true}],"summary":"From $99/month. 7-day free trial.","currency":"USD","freeTier":false,"sourceUrl":"https://www.emailonacid.com/pricing/","retrievedAt":"2026-08-25T12:11:37.247Z","freeTrialDays":7,"startingPrice":{"amount":99,"period":"month","currency":"USD"},"billingPeriods":["month"]}` | `{"type":"free","freeTier":true,"sourceUrl":"https://www.mailslurp.com/compare/litmus-pricing/","retrievedAt":"2026-10-12T16:13:40.324Z"}` |
| pricing.free_tier | no | yes |
| pricing.model | commercial | free |
| pricing.price_level | high | free |
| pricing.starting_price | `{"amount":99,"currency":"USD"}` | - |
| pricing.transparent | yes | no |
| reliability.sla_pct | 99.9 | - |
| security.gdpr | yes | yes |
| security.iso27001 | yes | - |
| security.soc2 | yes | yes |
| security.trust_center | - | https://www.mailslurp.com/compliance/ |

## Capabilities (Email Testing Dev)

| Capability | Email on Acid | MailSlurp |
|---|:--:|:--:|
| **Capabilities** |  |  |
| API assertions | ✓ | ✓ |
| Rendering preview | ✓ | ✓ |
| Spam score check | ✓ | ✓ |
| Blocklist deliverability check | ✓ | ✓ |
| SMS testing | ✗ | ✓ |
| Production sending addon | ✗ | ✓ |
| Ci cd integration | ✗ | ✓ |
| Multi user inboxes | ✗ | ✓ |
| Open source | ✗ | ✗ |

*Source: vioscaleAI. Generated 2026-10-16T19:19:35.642Z. "-" = undocumented, not absent.*