Best Email Testing Software in 2026
Updated
In short: Twilio Segment is ranked #1 of 28 as of 4 October 2026, ahead of Emailens and Mailpit. The best-ranked option with a free plan is Emailens. The lowest first paid tier on this page is Unspam.email at $5/mo.
Email testing tools help you assess messages across inboxes, email clients, and devices. Compare client and device coverage with inbox testing, spam checks, and link checks to understand which review needs each option addresses. Accessibility checks may be relevant to your review, while API access provides another listed point of comparison. Look at free-plan availability and “Paid from” details alongside those capabilities. Emailens leads the ranked entries, followed by GlockApps and MailSlurp; Litmus, Unspam.email, Mailosaur, EmailQA, and RenderOps also appear near the beginning. Weigh the checks and coverage shown against the way you prepare and review email.
28 email testing software ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
Recognised 40% · Phone app 26% · Documented 20% · Free plan 14% of the score
- 1 Twilio Segment iPhone + Android RecognisedPhone appDocumentedFree plan 7.9$120/mo Device coverage: bothSpam checks: Yes
- 2 Emailens No phone app RecognisedPhone appDocumentedFree plan 6.4$9/mo Email clients: 21 clientsDevice coverage: bothSpam checks: Yes
- 3 Mailpit No phone app RecognisedPhone appDocumentedFree plan 6.4Free Device coverage: bothSpam checks: Yes
- 4 MailSlurp No phone app RecognisedPhone appDocumentedFree plan 6.4$19.99/mo Email clients: 2 clientsDevice coverage: bothSpam checks: Yes
- 5 GlockApps No phone app RecognisedPhone appDocumentedFree plan 6.3$59/mo
- 6 SMTP Labs No phone app RecognisedPhone appDocumentedFree plan 6.3$7/mo Spam checks: Yes
- 7 Mailgun No phone app RecognisedPhone appDocumentedFree plan 6.1Free
- 8 Twilio Email Testing No phone app RecognisedPhone appDocumentedFree plan 5.8$15/mo Device coverage: bothSpam checks: Yes
- 9 Inbox Monster No phone app RecognisedPhone appDocumentedFree plan 5.6$312.50/mo Email clients: 120 clientsDevice coverage: bothSpam checks: Yes
- 10 Litmus No phone app RecognisedPhone appDocumentedFree plan 5.6$99/mo Email clients: 100 clientsDevice coverage: bothSpam checks: Yes
- 11 Mailosaur No phone app RecognisedPhone appDocumentedFree plan 5.6$20/mo Device coverage: bothSpam checks: Yes
- 12 SendForensics No phone app RecognisedPhone appDocumentedFree plan 5.6$49/mo Device coverage: bothSpam checks: Yes
- 13 EmailQA No phone app RecognisedPhone appDocumentedFree plan 5.5 Email clients: 11 clientsDevice coverage: bothSpam checks: No
- 14 Mailinator No phone app RecognisedPhone appDocumentedFree plan 5.4
- 15 RenderOps No phone app RecognisedPhone appDocumentedFree plan 5.4 Email clients: 21 clientsDevice coverage: bothSpam checks: Yes
- 16 Mailtrap Email Sandbox No phone app RecognisedPhone appDocumentedFree plan 5.3$17/mo Spam checks: Yes
- 17 Postdrop No phone app RecognisedPhone appDocumentedFree plan 5.3 Device coverage: both
- 18 Testi@ No phone app RecognisedPhone appDocumentedFree plan 5.3 Device coverage: bothSpam checks: Yes
- 19 testmail.app No phone app RecognisedPhone appDocumentedFree plan 5.3 Spam checks: Yes
- 20 Email Accessibility No phone app RecognisedPhone appDocumentedFree plan 5.2
- 21 MailTester No phone app RecognisedPhone appDocumentedFree plan 5.2 Spam checks: Yes
- 22 smtp4dev No phone app RecognisedPhone appDocumentedFree plan 5.2 Device coverage: both
- 23 Unspam.email No phone app RecognisedPhone appDocumentedFree plan 5.2$5/mo
- 24 Email Preview Services No phone app RecognisedPhone appDocumentedFree plan 5.1 Spam checks: Yes
- 25 Ethereal Email No phone app RecognisedPhone appDocumentedFree plan 5.1
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 Samsung Mobile US Press?
Twilio Segment is ranked #1 of 28 with a score of 7.9. Emailens is second and Mailpit third.
How many of these have a free plan?
9 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 mobile-first: a phone app alongside the web or desktop product, a free tier and the depth of its documentation. Paid placements never change a rank.