Best Email Testing Software in 2026
Updated
In short: Mailpit is ranked #1 of 28 as of 4 October 2026, ahead of Twilio Segment and Emailens. The best-ranked option with a free plan is Twilio Segment. The lowest first paid tier on this page is Unspam.email at $5/mo.
Email testing software helps you inspect messages across inboxes before they reach recipients. Compare email-client and device coverage alongside inbox testing, spam checks, and link checks to understand which review needs each option addresses. Accessibility checks and API access may be important to your process too, while free-plan availability and paid-from pricing provide additional comparison points. Emailens and GlockApps lead the ranking, followed by MailSlurp, Unspam.email, and EmailQA. Consider which checks matter most to your team and how the listed coverage fits your email workflow.
28 email testing software ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
10 of the 25 here have a free tier you can use, 0 have open-source code on record, and 0 have full bars: free, open, on most of your devices and documented.
| # | App | Signal | Free tier | Open code | Devices | From | Score |
|---|---|---|---|---|---|---|---|
| 1 | MailpitWeb · Windows · Mac · Linux · Self-hosted · API | Three bars | — | 4 of 6 | Free | 6.7 | |
| 2 | Twilio SegmentWeb · Android · iPhone | Three bars | — | 3 of 6 | $120/mo | 6.6 | |
| 3 | EmailensWeb · API · Extension | Two bars | — | 1 of 6 | $9/mo | 6.4 | |
| 4 | GlockAppsWeb · API | Two bars | — | 1 of 6 | $59/mo | 6.4 | |
| 5 | MailSlurpWeb · API | Two bars | — | 1 of 6 | $19.99/mo | 6.4 | |
| 6 | SMTP LabsWeb · API | Two bars | — | 1 of 6 | $7/mo | 6.4 | |
| 7 | MailgunWeb | Two bars | — | 1 of 6 | Free | 6.3 | |
| 8 | Twilio Email TestingWeb | One bar | — | — | 1 of 6 | $15/mo | 5.4 |
| 9 | EmailQAWeb | One bar | — | — | 1 of 6 | — | 5.3 |
| 10 | smtp4devWeb · Windows · Mac · Linux | One bar | — | — | 4 of 6 | — | 5.3 |
| 11 | MailCatcherWeb · Mac · Linux · Self-hosted · API | One bar | — | — | 3 of 6 | — | 5.2 |
| 12 | MailHogWeb · Mac · Linux · Self-hosted · API | Two bars | — | 3 of 6 | Free | 5.2 | |
| 13 | MailinatorWeb | No signal | — | — | 1 of 6 | — | 5.2 |
| 14 | Mailtrap Email SandboxWeb · API | One bar | — | 1 of 6 | $17/mo | 5.2 | |
| 15 | PostdropWeb | No signal | — | — | 1 of 6 | — | 5.2 |
| 16 | RenderOpsWeb | No signal | — | — | 1 of 6 | — | 5.2 |
| 17 | Testi@Web | No signal | — | — | 1 of 6 | — | 5.2 |
| 18 | testmail.appWeb | No signal | — | — | 1 of 6 | — | 5.2 |
| 19 | Email AccessibilityWeb | No signal | — | — | 1 of 6 | — | 5.1 |
| 20 | Ethereal EmailWeb | No signal | — | — | 1 of 6 | — | 5.1 |
| 21 | MailDevWeb | No signal | — | — | 1 of 6 | — | 5.1 |
| 22 | MailTesterWeb | No signal | — | — | 1 of 6 | — | 5.1 |
| 23 | Unspam.emailWeb · API | One bar | — | 1 of 6 | $5/mo | 5.1 | |
| 24 | Inbox MonsterWeb | One bar | — | — | 1 of 6 | $312.50/mo | 5.0 |
| 25 | LitmusWeb · API · Extension | One bar | — | — | 1 of 6 | $99/mo | 5.0 |
Is your app on this list?
Numbered spots on this list can be sponsored. They are labelled, and the editorial order and scores never change for payment.
Questions about this list
Which email testing software is ranked first on Freedom251?
Mailpit is ranked #1 of 28 with a score of 6.7. Twilio Segment is second and Emailens third.
How many of these have a free plan?
10 of the 25 on this page publish a free plan on their own pricing pages.
Which is the cheapest paid option?
On this page, Unspam.email has the lowest first paid tier we found: $5/mo.
How is this list ranked?
Ranked free-and-open first: a usable free tier and open-source code, then the platforms it runs on and its documentation. Paid placements never change a rank.