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Tech riderRev. 20 Sept 2026

MailCatcher

Ch 126.6of 28 Email Testing Software
  1. 1Runs onAPI, Linux, Mac, self-hosted, Web
  2. 2CostsNot stated by the maker
  3. 3API accessYes
2 lines stated Written from the maker's own pages: mailcatcher.me
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The MailCatcher homepage

Overview

MailCatcher is ranked #12 of 28 in email testing software on Specifiction. It runs on API, Linux, macOS, Self-hosted, Web.

Compared on email testing software

API access
Yesmailcatcher.me

Facts

Purpose
MailCatcher runs a local SMTP server that captures messages and displays them in a web interface.mailcatcher.me · 4 Oct 2026
Message views
It displays HTML, plain text, and source versions of captured messages when available.mailcatcher.me · 4 Oct 2026
Images and links
It rewrites HTML to display embedded images and open links in a new window.mailcatcher.me · 4 Oct 2026
Attachments
It lists attachments, allows separate downloads of message parts, and can download the original email.mailcatcher.me · 4 Oct 2026
Live updates
Messages appear instantly in browsers with WebSockets support; otherwise the interface updates every thirty seconds.mailcatcher.me · 4 Oct 2026
Integrations
The maker documents setup examples for Rails, PHP, and Django.mailcatcher.me · 4 Oct 2026
API
Its URL API provides message lists and metadata in JSON, message HTML and plain text, attachment parts, and full source.mailcatcher.me · 4 Oct 2026
Installation
The maker documents installation as a Ruby gem and provides a Docker image.github.com · 4 Oct 2026
Requirements
The repository README says MailCatcher requires Ruby 3.3 or newer and notes build tools may be needed for dependencies.github.com · 4 Oct 2026
Limits
The maker says mail processing is basic and that UTF-8 is not completely supported directly over the wire.mailcatcher.me · 4 Oct 2026
License
The project is released under the MIT License.github.com · 4 Oct 2026
Support
The maker directs users to file an issue for problems and invites them to include the full message that caused trouble.mailcatcher.me · 4 Oct 2026
Intended use
The setup instructions direct applications to send mail to a local SMTP endpoint for inspection in development.mailcatcher.me · 4 Oct 2026

Best MailCatcher alternatives

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All accessCh 01 Twilio Segment Free planFree trialWeb from $120/mo7.8 All accessCh 02 Mailpit Free planAPILinux Free to start7.5 All accessCh 03 GlockApps Free planFree trialAPI from $59/mo7.3 All accessCh 04 MailSlurp Free planAPIWeb from $19.99/mo7.1 All accessCh 05 MailHog Free planAPILinux Free to start7.0 All accessCh 06 Mailtrap Email Sandbox Free planAPIWeb from $17/mo7.0

Where it ranks on Specifiction

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Sources