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 MailSlurp. The best-ranked option with a free plan is Twilio Segment. The lowest first paid tier on this page is SMTP Labs at $7/mo.
Check how an email looks and behaves across the environments your recipients use by comparing client and device coverage, inbox testing, and link checks. Emailens, GlockApps, and MailSlurp open the ranked entries, followed by Litmus and Mailosaur. Spam checks and accessibility checks are also listed criteria, while API access may be relevant to how your team incorporates testing into its workflow. Free-plan availability and paid-from pricing offer further points of comparison. Use the checks that matter to your review process to assess the options, whether you are focused on rendering, deliverability signals, or accessibility.
28 email testing software ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
#1 Mailpit Top pick · 7.4 Free plan · Free
#2 Twilio Segment Runner-up · 7.2 Free plan · $120/mo
#3 MailSlurp Also great · 7.0 Free plan · $19.99/mo
- Free plan apiLinuxmacOSself-hostedWebWindows
- Device coverage
- both
- Spam checks
- Yes
RecognisedDocumentedFree planPlatforms - Free planFree trial WebiOSAndroid
- Free plan
- Yes
- Paid from
- 15 /mo
- Device coverage
- both
- Spam checks
- Yes
RecognisedDocumentedFree planPlatforms$120/mofirst paid tier About Twilio SegmentVisit site - Free plan apiWeb
- Free plan
- Yes
- Paid from
- 19.99 /mo
- Email clients
- 2 clients
- Device coverage
- both
- Spam checks
- Yes
- Accessibility checks
- Yes
RecognisedDocumentedFree planPlatforms$19.99/mofirst paid tier About MailSlurpVisit site - Free plan apiextensionWeb
- Free plan
- Yes
- Paid from
- 9 /mo
- Email clients
- 21 clients
- Device coverage
- both
- Spam checks
- Yes
- Accessibility checks
- Yes
RecognisedDocumentedFree planPlatforms$9/mofirst paid tier About EmailensVisit site - Free planFree trial apiWeb
- Free plan
- Yes
- Paid from
- 59 /mo
RecognisedDocumentedFree planPlatforms$59/mofirst paid tier About GlockAppsVisit site - Free plan apiWeb
- Free plan
- Yes
- Paid from
- 7 /mo
- Spam checks
- Yes
RecognisedDocumentedFree planPlatforms$7/mofirst paid tier About SMTP LabsVisit site - Free plan Web
- Free plan
- Yes
RecognisedDocumentedFree planPlatforms - Web
- Free plan
- Yes
- Paid from
- 15 /mo
- Device coverage
- both
- Spam checks
- Yes
RecognisedDocumentedFree planPlatforms$15/mofirst paid tier About Twilio Email TestingVisit site - Web
- Free plan
- No
- Email clients
- 120 clients
- Device coverage
- both
- Spam checks
- Yes
- Accessibility checks
- Yes
RecognisedDocumentedFree planPlatforms$312.50/mofirst paid tier About Inbox MonsterVisit site - Free trial apiextensionWeb
- Free plan
- No
- Email clients
- 100 clients
- Device coverage
- both
- Spam checks
- Yes
- Accessibility checks
- Yes
RecognisedDocumentedFree planPlatforms$99/mofirst paid tier About LitmusVisit site - Free trial apiWeb
- Free plan
- No
- Paid from
- 20 /mo
- Device coverage
- both
- Spam checks
- Yes
- Accessibility checks
- Yes
RecognisedDocumentedFree planPlatforms$20/mofirst paid tier About MailosaurVisit site - Web
- Free plan
- No
- Paid from
- 39 /mo
- Device coverage
- both
- Spam checks
- Yes
- Accessibility checks
- Yes
RecognisedDocumentedFree planPlatforms$49/mofirst paid tier About SendForensicsVisit site - Web
- Free plan
- Yes
- Paid from
- 20 /mo
- Email clients
- 11 clients
- Device coverage
- both
- Spam checks
- No
- Accessibility checks
- No
RecognisedDocumentedFree planPlatforms - WebWindowsmacOSLinux
- Free plan
- Yes
- Device coverage
- both
RecognisedDocumentedFree planPlatforms - Web
- Free plan
- Yes
- Paid from
- 79 /mo
RecognisedDocumentedFree planPlatforms - Web
- Free plan
- Yes
- Paid from
- 10 /mo
- Email clients
- 21 clients
- Device coverage
- both
- Spam checks
- Yes
- Accessibility checks
- Yes
RecognisedDocumentedFree planPlatforms - Free plan apiWeb
- Free plan
- Yes
- Paid from
- 14 /mo
- Spam checks
- Yes
RecognisedDocumentedFree planPlatforms$17/mofirst paid tier About Mailtrap Email SandboxVisit site - Web
- Free plan
- Yes
- Paid from
- 29 /mo
- Device coverage
- both
RecognisedDocumentedFree planPlatforms - Web
- Free plan
- Yes
- Device coverage
- both
- Spam checks
- Yes
RecognisedDocumentedFree planPlatforms - Web
- Free plan
- Yes
- Paid from
- 9 /mo
- Spam checks
- Yes
RecognisedDocumentedFree planPlatforms - Web
- Free plan
- Yes
- Paid from
- 10 /mo
- Accessibility checks
- Yes
RecognisedDocumentedFree planPlatforms - WebmacOSLinux
- Free plan
- Yes
RecognisedDocumentedFree planPlatforms - Web
- Free plan
- Yes
- Spam checks
- Yes
RecognisedDocumentedFree planPlatforms - Web
- Free plan
- No
- Spam checks
- Yes
RecognisedDocumentedFree planPlatforms - WebmacOSLinuxRecognisedDocumentedFree planPlatforms
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 Everything Xiaomi?
Mailpit is ranked #1 of 28 with a score of 7.4. Twilio Segment is second and MailSlurp third.
How many of these have a free plan?
8 of the 25 on this page publish a free plan on their own pricing pages.
Which is the cheapest paid option?
On this page, SMTP Labs has the lowest first paid tier we found: $7/mo.
How is this list ranked?
Ranked on what each maker publishes: documentation depth, a free tier and the platforms it runs on. Paid placements never change a rank.