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mailsocket vs Mailosaur
Mailosaur is an established email and SMS testing platform for QA teams. mailsocket is a smaller, email-only inbox API built around getting the OTP.
Checked October 2026. Prices and features change, so every Mailosaur fact on this page links to Mailosaur's own page as the source. Please check there before you decide.
Side by side
| Mailosaur | mailsocket | |
|---|---|---|
| Free plan | ❌ No free plan; 14-day free trial (source) | ✅ 3 inboxes, 1,000 / month, 1 day retention |
| Entry price | From $20/month, billed annually: 1 inbox with unlimited addresses, from 15,000 inbound emails/month (source) | Pro $12/mo: 10 inboxes, 10,000 / month |
| Team plan | From $50/month, billed annually, with 5 seats (source) | Scale $49/mo: 50 inboxes; team seats on Business $149/mo |
| Discount for paying yearly | ✅ Save 20% (source) | ❌ Monthly only |
| SMS testing | ✅ Add-on from $37.50/month (source) | ❌ Email only |
| Email previews (Gmail, Outlook, mobile) | ✅ Add-on from $25/month (source) | ❌ No |
| Custom domains | ✅ Yes (source) | ✅ On the Scale plan |
| Single Sign-On (SAML, OIDC) | ✅ On Enterprise (source) | ❌ No |
| Verification codes extracted automatically | ✅ Yes (source) | ✅ Yes, with a confidence score, every plan |
| Wait until a message arrives | ✅ The SDK messages.get call waits for a match, 10 seconds by default (source) | ✅ The REST call messages/wait blocks up to 25s, from any language or tool, every plan; the SDKs repeat it for you |
| How widely used | ✅ About 2.5 million npm downloads of its SDK in the 30 days to 1 October 2026 (source) | A new service with a small user base |
When to choose Mailosaur
- You need to test SMS codes as well as email.
- You want email previews across Gmail, Outlook and mobile clients.
- Your company needs Single Sign-On, a dedicated account manager or custom contract terms.
- You want an established, widely used product with a large user base.
When to choose mailsocket
- You only need email, and you want to start on a free plan with no trial clock.
- You want month-to-month billing from $12/mo.
- You want one REST call that blocks until the OTP or magic link arrives, from any language or tool, with or without an SDK.
- You want new mail pushed to you: a Server-Sent Events stream on every plan, and webhooks from the Pro plan.
- An AI agent needs an inbox: there is an MCP server, and an agent can get an API key without a signup form.
Try mailsocket
See it work without an account: the live demo creates an inbox and waits for a code in your browser. When you are ready, sign up for free to get an API key.
Spotted something out of date? Email support@mailsocket.app. See also: all comparisons.