Sendpit compared to MailCatcher

MailCatcher is a Ruby gem for capturing emails during local Rails development. Sendpit is a hosted SMTP sandbox that works with any language and makes emails visible to your entire team. Teams choose Sendpit when they need persistence, shared access, and framework-agnostic email capture.

MailCatcher served Rails well. What about everything else?

MailCatcher was built for Rails developers who needed a quick way to catch emails locally. It's a Ruby gem, it runs on your machine, and it's been a reliable tool for years. But when your stack grows beyond Rails—or your team grows beyond one—local tools hit their limits.

Sendpit is a hosted SMTP sandbox that works with any language. Your whole team sees the same inbox, emails persist between deploys, and you don't need Ruby installed.

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What MailCatcher does well

Ruby Gem
Quick Setup
Web UI
Rails Familiar

MailCatcher became a staple in Rails development for good reasons. Run `gem install mailcatcher`, start it up, point your development.rb at localhost:1025, and you're catching emails. The web UI at localhost:1080 shows what your app sent.

For Rails developers working alone on a single project, that workflow is hard to beat. No accounts, no configuration files, no internet connection required. It's the kind of tool that does one thing and does it simply.

MailCatcher earned its place in the Rails ecosystem. If you've been using it for years, you know why.

When local tooling becomes a bottleneck

"We added a Node service"

MailCatcher is a Ruby gem. Your Go microservice or Python worker doesn't share the same toolchain.

"QA can't see what I see"

Your MailCatcher runs on your laptop. QA's staging environment sends emails into the void.

"CI needs an SMTP endpoint"

Running MailCatcher in CI is possible but awkward. Ephemeral containers don't persist emails between jobs.

"Is this still maintained?"

MailCatcher's update frequency has slowed. For some teams, that's a dependency risk.

The moment your stack includes services outside Ruby—or your team includes people who need to see emails from staging—MailCatcher's model starts showing gaps. It was built for a simpler time when one developer ran one Rails app.

A hosted SMTP sandbox gives you the same capture-and-inspect workflow, but without the Ruby dependency, without the local-only limitation, and without worrying about project activity.

Ruby gem vs. hosted service

MailCatcher 5 modules
Ruby gem
Local SMTP
Single inbox
No team access
No environment separation

Designed for its specific use case.

Sendpit 5 modules
Any language
Hosted SMTP
Shared inbox
Email retention
Team access

Hosted SMTP sandbox for teams.

Both capture emails. The difference is where the inbox lives, what languages it supports, and who can see it.

Works with any framework

Your app sends
Sendpit captures
Team inspects

The core loop is the same: configure SMTP, send emails, inspect what arrives. But Sendpit doesn't care what language your app is written in. Rails, Laravel, Django, Express, Go—anything that speaks SMTP works.

You can inspect HTML, view headers, check links, and download attachments. Emails persist based on your retention settings. No Ruby installation, no process management, no lost emails when you close your laptop.

One SMTP config works across local dev, CI, and staging. Everyone on the team sees what's being sent, regardless of what framework they're working with.

Emails are stored temporarily, encrypted, and automatically deleted based on your retention settings.

Ruby / Rails PHP / Laravel Python / Django Node.js Any SMTP client

Choosing the right tool

MailCatcher makes sense if...

  • You're working alone on a Rails project.
  • Your entire stack is Ruby and likely to stay that way.
  • You prefer offline-first, local-only tools.
  • You don't need emails to persist or be shared.

Sendpit makes sense if...

  • Your stack includes non-Ruby services.
  • You need teammates or QA to see the same emails.
  • Your CI pipeline or staging server sends emails.
  • You want emails to persist and be retrievable.
Try Sendpit free

Many Rails teams use both. MailCatcher for quick local debugging when you're deep in development, Sendpit for shared environments where the whole team needs visibility.

Looking for other comparisons?

Sendpit vs Mailtrap · Sendpit vs MailHog

Try Sendpit free

Sendpit has a free tier that covers most small team needs. Setup is the same as any SMTP tool—update your credentials and start capturing. No Ruby required.

If you've outgrown MailCatcher's local-only model, the fastest way to know if Sendpit fits is to try it.

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