MailHog vs MailCatcher
Two older Go and Ruby catchers, both trailing Mailpit on maintenance and HTML rendering.
What matters for SaaS product teams
A SaaS product sends on behalf of its customers, so the deciding factors are tenant isolation, whether suppressions can be scoped rather than global, and whether support can answer why one specific account did not receive one specific email. Lifecycle automation and transactional sending usually need to coexist.
| Priority | MailHog | MailCatcher |
|---|---|---|
| Multi-tenant | No | No |
| Event stream | No | No |
| Suppressions API | No | No |
| Operating since | Not published | Not published |
| Scheduling | No | No |
| Best published rate per 1,000 | Tiers not published in comparable form | Tiers not published in comparable form |
| Deliverability | Not applicable; capture-only. | Not applicable. |
| Webhooks | No | No |
| Starts at | Free | Free |
For a multi-tenant SaaS product running trial expiry notices, dunning, onboarding sequences, and per-tenant transactional mail, the two are level on every priority that can be scored here, so the choice comes down to price and to which product your team would rather operate. On entry price, MailHog offers Free against Free from MailCatcher. That ordering reflects this audience. Weigh the same table differently and the answer changes.
Side by side
| Feature | MailHog | MailCatcher |
|---|---|---|
| Multi-tenant | No | No |
| Deliverability | Not applicable; capture-only. | Not applicable. |
| Webhooks | No | No |
| Starts at | Free | Free |
| Tagline | Classic local SMTP catcher (unmaintained since 2020). | Tiny Ruby-based local SMTP catcher. |
| Free tier | Free, MIT-licensed | Free, MIT-licensed |
| Pricing model | self-hosted | self-hosted |
| API | Yes | Yes |
| SMTP | Yes | Yes |
| SDKs | None | None |
| Templates | none | none |
| React Email | No | No |
| Inbound | No | No |
| Idempotency | No | No |
| Dedicated IP | No | No |
| DX score | 5/10 | 6/10 |
| Best for | Legacy projects already wired to it. | Rails teams already running it in development. |
MailHog
- ›Familiar from years of tutorials and boilerplates
- ›Single Go binary with a Docker image and a chaos-testing mode
- ›No meaningful releases since 2020
- ›HTML and modern CSS rendering trails current email clients
- ›Open issues and pull requests are effectively unattended
MailCatcher
- ›Installs as a Ruby gem, familiar in Rails stacks
- ›SMTP on 1025 with a web UI and JSON API on 1080
- ›Shows HTML, plain text, and raw source per message
- ›Release cadence is slow with little active feature work
- ›Needs a Ruby runtime where Mailpit ships a static binary
- ›HTML rendering trails newer catchers