Best smtp4dev Alternatives in 2026
Updated
20 platforms from email testing software ranked against smtp4dev on the same published basis.
- 1smtp4dev vs Twilio Segment
- 2smtp4dev vs GlockApps
- 3smtp4dev vs Mailpit
- 4smtp4dev vs MailSlurp
- 5smtp4dev vs Mailtrap Email Sandbox
- 6smtp4dev vs SMTP Labs
- 7smtp4dev vs Unspam.email
- 8smtp4dev vs Emailens
- 9smtp4dev vs MailHog
- 10smtp4dev vs Litmus
- 11smtp4dev vs Mailgun
- 12smtp4dev vs Mailosaur
- 13smtp4dev vs Twilio Email Testing
- 14smtp4dev vs MailCatcher
- 15smtp4dev vs Inbox Monster
- 16smtp4dev vs SendForensics
- 17smtp4dev vs EmailQA
- 18smtp4dev vs Mailinator
- 19smtp4dev vs RenderOps
- 21smtp4dev vs Postdrop
smtp4dev alternatives compared
| # | Platform | Score | Free plan | From | Runs on |
|---|---|---|---|---|---|
| 1 | Twilio Segment | 7.9 | Free plan | $120/mo | Web, iOS, Android |
| 2 | GlockApps | 7.6 | Free plan | $59/mo | API, Web |
| 3 | Mailpit | 7.2 | Free plan | Free | API, Linux, Mac, self-hosted, Web, Windows |
| 4 | MailSlurp | 7.2 | Free plan | $19.99/mo | API, Web |
| 5 | Mailtrap Email Sandbox | 7.1 | Free plan | $17/mo | API, Web |
| 6 | SMTP Labs | 7.0 | Free plan | $7/mo | API, Web |
| 7 | Unspam.email | 7.0 | Free plan | $5/mo | API, Web |
| 8 | Emailens | 6.9 | Free plan | $9/mo | API, Browser, Web |
| 9 | MailHog | 6.9 | Free plan | Free | API, Linux, Mac, self-hosted, Web |
| 10 | Litmus | 6.8 | No | $99/mo | API, Browser, Web |
| 11 | Mailgun | 6.7 | Free plan | Free | Web |
| 12 | Mailosaur | 6.7 | No | $20/mo | API, Web |
| 13 | Twilio Email Testing | 6.4 | No | $15/mo | Web |
| 14 | MailCatcher | 6.3 | No | — | API, Linux, Mac, self-hosted, Web |
| 15 | Inbox Monster | 6.2 | No | $312.50/mo | Web |
| 16 | SendForensics | 6.2 | No | $49/mo | Web |
| 17 | EmailQA | 6.0 | No | — | Web |
| 18 | Mailinator | 5.9 | Free plan | $79/mo | API, Web |
| 19 | RenderOps | 5.9 | No | — | Web |
| 21 | Postdrop | 5.8 | No | — | Web |
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Questions about smtp4dev alternatives
What is the best alternative to smtp4dev?
Twilio Segment, number 1 in email testing software with a score of 7.9 out of 10. The others here: GlockApps, Mailpit, MailSlurp and 16 more.
What is the best free alternative to smtp4dev?
Twilio Segment is the best-ranked alternative with a free plan. 11 of the 20 alternatives here publish a free plan on their own pricing pages.
How are these alternatives ranked?
Ranked on how quickly a newcomer can get going: documentation depth, a free tier or trial, and the platforms it runs on.