Best Email Testing Software in 2026
Updated
Before a campaign goes out, you may want to check how its email looks and works in different environments. Compared on accessibility checks, API access, device coverage, email clients, inbox testing, link checks and spam checks, these tools cover several parts of pre-send review. Free-plan availability and paid-from pricing can help you compare access and starting cost. Twilio Segment, Emailens and Mailpit are among the entries to consider, alongside MailSlurp and GlockApps. Think about which clients and devices matter to your audience, and whether your process also calls for accessibility review or API access. The listed criteria can help you weigh those needs against the options.
28ranked
19free plans on this page
$5/molowest paid tier
10 Oct 2026last checked
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 EmailQA No phone app RecognisedPhone appDocumentedFree plan 6.4$20/mo Email clients: 11 clientsDevice coverage: bothSpam checks: No
- 4 Mailinator No phone app RecognisedPhone appDocumentedFree plan 6.4$79/mo
- 5 Mailpit No phone app RecognisedPhone appDocumentedFree plan 6.4Free Device coverage: bothSpam checks: Yes
- 6 MailSlurp No phone app RecognisedPhone appDocumentedFree plan 6.4$19.99/mo Email clients: 2 clientsDevice coverage: bothSpam checks: Yes
- 7 Mailtrap Email Sandbox No phone app RecognisedPhone appDocumentedFree plan 6.4$17/mo Spam checks: Yes
- 8 Postdrop No phone app RecognisedPhone appDocumentedFree plan 6.4$29/mo Device coverage: both
- 9 testmail.app No phone app RecognisedPhone appDocumentedFree plan 6.4$9/mo Spam checks: Yes
- 10 Email Accessibility No phone app RecognisedPhone appDocumentedFree plan 6.3$10/mo
- 11 GlockApps No phone app RecognisedPhone appDocumentedFree plan 6.3$59/mo
- 12 MailTester No phone app RecognisedPhone appDocumentedFree plan 6.3Free Spam checks: Yes
- 13 RenderOps No phone app RecognisedPhone appDocumentedFree plan 6.3$10/mo Email clients: 21 clientsDevice coverage: bothSpam checks: Yes
- 14 SMTP Labs No phone app RecognisedPhone appDocumentedFree plan 6.3$7/mo Spam checks: Yes
- 15 Unspam.email No phone app RecognisedPhone appDocumentedFree plan 6.3$5/mo
- 16 Ethereal Email No phone app RecognisedPhone appDocumentedFree plan 6.2Free
- 17 MailDev No phone app RecognisedPhone appDocumentedFree plan 6.2Free
- 18 MailHog No phone app RecognisedPhone appDocumentedFree plan 6.2Free
- 19 Mailgun No phone app RecognisedPhone appDocumentedFree plan 6.1Free
- 20 MailCatcher No phone app RecognisedPhone appDocumentedFree plan 5.8
- 21 Twilio Email Testing No phone app RecognisedPhone appDocumentedFree plan 5.8$15/mo Device coverage: bothSpam checks: Yes
- 22 smtp4dev No phone app RecognisedPhone appDocumentedFree plan 5.7 Device coverage: both
- 23 Testi@ No phone app RecognisedPhone appDocumentedFree plan 5.7£16/mo Device coverage: bothSpam checks: Yes
- 24 Inbox Monster No phone app RecognisedPhone appDocumentedFree plan 5.6$312.50/mo Email clients: 120 clientsDevice coverage: bothSpam checks: Yes
- 25 Litmus No phone app RecognisedPhone appDocumentedFree plan 5.6$99/mo Email clients: 100 clientsDevice coverage: bothSpam checks: Yes
Compare all 25 in a table
| # | App | Score | Free plan | From | Free plan | Paid from | Email clients | Device coverage |
|---|---|---|---|---|---|---|---|---|
| 1 | Twilio Segment | 7.9 | Free plan | $120/mo | Yes | 15 /mo | both | |
| 2 | Emailens | 6.4 | Free plan | $9/mo | Yes | 9 /mo | 21 clients | both |
| 3 | EmailQA | 6.4 | Free plan | $20/mo | Yes | 20 /mo | 11 clients | both |
| 4 | Mailinator | 6.4 | Free plan | $79/mo | Yes | 79 /mo | ||
| 5 | Mailpit | 6.4 | Free plan | Free | both | |||
| 6 | MailSlurp | 6.4 | Free plan | $19.99/mo | Yes | 19.99 /mo | 2 clients | both |
| 7 | Mailtrap Email Sandbox | 6.4 | Free plan | $17/mo | Yes | 14 /mo | ||
| 8 | Postdrop | 6.4 | Free plan | $29/mo | Yes | 29 /mo | both | |
| 9 | testmail.app | 6.4 | Free plan | $9/mo | Yes | 9 /mo | ||
| 10 | Email Accessibility | 6.3 | Free plan | $10/mo | Yes | 10 /mo | ||
| 11 | GlockApps | 6.3 | Free plan | $59/mo | Yes | 59 /mo | ||
| 12 | MailTester | 6.3 | Free plan | Free | Yes | |||
| 13 | RenderOps | 6.3 | Free plan | $10/mo | Yes | 10 /mo | 21 clients | both |
| 14 | SMTP Labs | 6.3 | Free plan | $7/mo | Yes | 7 /mo | ||
| 15 | Unspam.email | 6.3 | Free plan | $5/mo | Yes | |||
| 16 | Ethereal Email | 6.2 | Free plan | Free | Yes | |||
| 17 | MailDev | 6.2 | Free plan | Free | Yes | |||
| 18 | MailHog | 6.2 | Free plan | Free | Yes | |||
| 19 | Mailgun | 6.1 | Free plan | Free | Yes | |||
| 20 | MailCatcher | 5.8 | ||||||
| 21 | Twilio Email Testing | 5.8 | $15/mo | Yes | 15 /mo | both | ||
| 22 | smtp4dev | 5.7 | Yes | both | ||||
| 23 | Testi@ | 5.7 | £16/mo | Yes | both | |||
| 24 | Inbox Monster | 5.6 | No | $312.50/mo | No | 120 clients | both | |
| 25 | Litmus | 5.6 | No | $99/mo | No | 100 clients | both |
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Numbered spots on this list can be sponsored, and a sponsored row is labelled as paid.
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