Maildev
Development email testing utility with SMTP server and web dashboard
- Also known as
- maildev
What is Maildev?
A developer tool that captures and displays incoming emails via SMTP in a web interface, enabling inspection and testing of email delivery during development.
Maildev pricing
We don't have Maildev's full plan breakdown yet (its pricing page resisted automated reading). Here's what we could confirm. Always check live pricing for exact numbers.
What Maildev does
The capabilities that matter for email testing dev, normalised so it lines up with every alternative. “-” means we haven't confirmed it, not that it's missing.
- API assertions
- ✓
- Rendering preview
- ✓
- Spam score check
- -
- Blocklist deliverability check
- -
- SMS testing
- -
- Production sending addon
- ✓
- Ci cd integration
- -
- Multi user inboxes
- -
- Open source
- ✓
Platform & deployment
Independently observed- CLI
- Web
- Self-hosted
Integrations (2)
Independently observed- Claude⇄•
- Gmail→
Security & compliance
Known vulnerabilities: 1 (0 in the last 12 months), max severity CRITICAL sourcea count reflects scale & disclosure, not quality
Maildev FAQ
Common questions about Maildev, answered from independent, dated evidence.
What is Maildev?
Runs as a local SMTP server with a web inbox interface to capture and review emails generated by your application during development. Supports AI agent integration through the Model Context Protocol for automated email inspection. It is indexed under Email Testing Dev.
Is Maildev free?
Maildev offers a free tier, so you can start without paying. Pricing changes often, so verify at source before relying on it.
What platforms does Maildev support?
Maildev supports the web and a command-line interface. Platforms we have not confirmed are simply not listed here rather than ruled out.
Can Maildev be self-hosted?
Yes. Maildev can be deployed self-hosted, so it does not have to run on the vendor's infrastructure.
Is Maildev open source?
Yes. Maildev is published under the MIT licence, a permissive licence that generally allows commercial use and modification. Licence terms can change between releases, so verify against the repository for the version you intend to use.
Maildev alternatives
Other email testing dev we track, ranked by the same independent score.
- Testmail.appAPI-based email testing platform for automated QA and CI/CD workflowslow · 45%
- MailosaurPlatform for automated email and SMS testing with integrated message previews and test automation supportmedium · 56%
- Email on AcidEmail testing and validation platform for pre-send campaign quality assurancemedium · 64%
- GreenMailAn open source sandbox for testing email server protocols without sending actual emailslow · 31%
- MailSlurpEmail and SMS testing and automation platform with API and dashboard accessmedium · 54%
- Mailpitlow · 29%
Compare Maildev
Side by side against other email testing dev, attribute by attribute, with a source on every value.
The vioscaleAI score: one lens on the evidence
Not user reviews and not a paid placement: a confidence-weighted blend of the independent signals below (adoption, activity, security posture, and more), which you can sort and re-weight yourself. Vendors can correct their listing but can never move their rank, and stars are weighted low as a vanity metric. It is one way to read the evidence for Maildev, not the verdict.
| Signal | Score | Weight | Contribution | Evidence |
|---|---|---|---|---|
| Development activity | 49 | 0.12 | 5.9 | ✓ |
| Capabilities | 67 | 0.08 | 5.6 | ✓ |
| Release cadence | 77 | 0.07 | 5.1 | ✓ |
| Dependent projects | 42 | 0.08 | 3.3 | ✓ |
| Stars | 72 | 0.03 | 2.4 | ✓ |
| Security score | 46 | 0.05 | 2.4 | ✓ |
| Integrations | 14 | 0.05 | 0.7 | ✓ |
| Security posture | 0 | 0.09 | 0.0 | - |
| Package downloads | 0 | 0.17 | 0.0 | - |
| Developer Q&A activity | 0 | 0.08 | 0.0 | - |
Computed . Re-weight it by intent, or see the full method.
All data & sourcesshow ↓
Every value we hold, with its source, retrieval date, and confidence. This is the evidence behind the score: don't trust it, verify it.
Activity
| Attribute | Value | Evidence |
|---|---|---|
| Commits last 30d | 35 | mediumsource · 2026-09-11 · 65% |
Adoption
Content
| Attribute | Value | Evidence |
|---|---|---|
| Faq | 5 items | mediumsource · 2026-09-10 · 67% |
Features
| Attribute | Value | Evidence |
|---|---|---|
| Capabilities | Open source, Api assertions, Rendering preview, Production sending addon | mediumsource · 2026-10-13 · 60% |
Integrations
| Attribute | Value | Evidence |
|---|---|---|
| Count | 2 | mediumsource · 2026-10-13 · 60% |
Language
| Attribute | Value | Evidence |
|---|---|---|
| Primary | TypeScript | highsource · 2026-10-13 · 90% |
License
| Attribute | Value | Evidence |
|---|---|---|
| Spdx | MIT | highsource · 2026-10-13 · 95% |
Pricing
Release
Security
Is Maildev the right choice for you?
Tell us the job, the constraints and what you weigh most, and we will rank Maildev against the rest of the email testing dev we index, using the same dated evidence weighted your way.
Free to run, no account needed to start. How the evaluation works
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