Mailosaur is built for QA fleets.
Sendpit is built for developers.
Mailosaur is an enterprise email and SMS testing platform for QA automation. Sendpit is a straightforward SMTP sandbox for development teams. The honest comparison, round by round.
Key Facts
- SendPit Basic: $5/mo for 3 mailboxes and up to 1,000 stored emails across all mailboxes
- Mailosaur SaaS testing platform
- Pricing and features last verified: 2026-03-18
Where Sendpit wins
vs mailosaur team plans · monthly billing · verified 2026-03-18Mailosaur offers a trial but no permanent free tier. Sendpit's free plan includes room for 200 stored test emails, 3 seats and full inspection, and never expires.
Basic gets you 3 mailboxes and room for 1,000 stored emails across them. Every plan includes every feature; you pay for capacity.
Swap the SMTP credentials in your mail config and send. No API key, no client library, no test framework integration required.
Contractors and clients see only the mailboxes they are assigned to. Mailosaur access is account-wide across servers.
Feature by feature
16 features · 3 groups| Feature | Mailosaur | Sendpit |
|---|---|---|
| Inspection: full parity | ||
| SMTP capture | ✓ | ✓ |
| HTML & text preview | ✓ | ✓ |
| Raw source & headers | ✓ | ✓ |
| Spam score analysis | ✓ | ✓ |
| Link checker | ✓ | ✓ |
| OTP & link extraction | ✓ | ✓ pre-extracted |
| Where they differ | ||
| Free tier | — trial only | ✓ forever |
| Entry paid plan | $49/mo | $5/mo · 3 mailboxes · 1,000 stored emails |
| Setup | API key + SDK integration | 30 seconds, SMTP only |
| Email client previews | 90+ real clients | HTML preview |
| SMS testing | ✓ | — email only |
| Per-mailbox access control | — account-wide | ✓ |
| REST API | ✓ SDKs for 6 languages | ✓ Basic and above |
| Platform | ||
| Product focus | QA automation platform | test capture, only |
| Team model | account-level servers | per-mailbox roles |
| Data handling | enterprise QA pipeline | TLS · encrypted at rest · auto-purge |
Mailosaur makes sense if...
- · You have a dedicated QA team running automated end-to-end tests.
- · You need to preview emails across 90+ real email clients and devices.
- · Your application sends both email and SMS and you want to test both channels.
Sendpit makes sense if...
- ✓ Your team needs safe SMTP capture during development-nothing more.
- ✓ You want to start free and only pay when your team grows.
- ✓ You value 30-second setup over feature depth.
- ✓ You need per-mailbox access control for contractors or clients.
Some teams use Mailosaur in their CI pipeline for automated email assertions while using Sendpit for day-to-day development. One is a testing framework, the other is a development utility. Choosing one doesn't mean rejecting the other.
Frequently asked questions
Can Sendpit replace Mailosaur completely?
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It depends on your workflow. If you use Mailosaur primarily for automated QA assertions, email client previews, or SMS testing, Sendpit does not offer those features. If you use Mailosaur mainly as an SMTP sandbox to capture and visually inspect test emails, Sendpit covers that use case at a fraction of the cost. Many teams find they only use a small portion of Mailosaur's capabilities and can switch to Sendpit for their development workflow while keeping Mailosaur for CI if needed.
Does Sendpit have an API like Mailosaur?
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Sendpit provides a REST API for programmatic email retrieval (Basic and above), webhooks for push notifications (Pro and above), and a Wait API for long-polling new arrivals. Mailosaur offers a broader API surface with official SDK libraries in multiple languages and built-in assertion helpers for automated testing. If your workflow depends heavily on SDK integrations and test framework assertions, Mailosaur's ecosystem is more mature. For straightforward API retrieval and webhook-driven workflows, Sendpit covers the core use cases at a lower price point.
How does Sendpit's free tier compare to Mailosaur's trial?
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Mailosaur offers a time-limited trial to evaluate the platform. Sendpit's free tier is permanent-it is not a trial that expires. You can use it as long as you want with generous limits that cover most small team needs. If your team is small and your email testing volume is moderate, you may never need to upgrade.
Can I use Sendpit for automated testing in CI/CD?
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You can point your CI environment's SMTP configuration at Sendpit to capture emails generated during test runs. Webhooks can notify your pipeline when emails arrive. However, for complex automated assertions against email content-verifying specific text, parsing links, checking attachments programmatically-Mailosaur's API-driven approach is better suited. Sendpit is optimized for the human-in-the-loop workflow rather than fully automated email verification.
How long does it take to switch from Mailosaur to Sendpit?
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About thirty seconds. Create a Sendpit account, get your SMTP credentials, and update the SMTP host, port, username, and password in your application's environment configuration. There are no SDKs to uninstall or code changes required. Your application sends email the same way it always did-the only difference is the destination.
Does Sendpit support email rendering previews like Mailosaur?
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Sendpit provides HTML email preview so you can see how your email renders in a browser. It does not offer Mailosaur's cross-client rendering across 90+ email clients and devices. If you need to verify how your email looks in Outlook 2019 on Windows, Gmail on an Android tablet, and Apple Mail on iOS simultaneously, Mailosaur's preview feature is purpose-built for that. If you just need to confirm your HTML looks right, Sendpit's preview covers that.
Free forever, not a trial
1 mailbox · 3 seats · 200 stored emails · full inspection · no card · never expires also comparing: Mailtrap · MailHog · Mailpit · MailCatcher · Ethereal Email