Side by side
Folderly vs Mail-Tester
Both stand on email deliverability software. Which one you can start free with, which one lets you read the code, and what each costs once you pay.
Free plan APIWeb
Folderly combines campaign drafting with delivery checks and monitoring, with a free option for limited Inbox Insights testing and free Pulse alerts. Product-specific availability and the stated minimum commitment for mailbox plans merit a close check before selecting a plan.
Visit Folderly Free plan APIWeb
Mail-Tester offers a straightforward email check with a free allowance and paid integration options. Its score is not a promise of inbox delivery, and results have limited retention periods.
Visit Mail-TesterThe facts
| Folderly | Mail-Tester | |
|---|---|---|
| Free plan | Yes | Yes |
| Open source | Not published | Not published |
| Runs on | API, Web | API, Web |
| Lowest paid plan | See the plans | 50 Tests / Month: $10 a month |
| Plans published | 12 | 10 |
| Maker | Not published | Not published |
| Website | folderly.com | mail-tester.com |
| On email deliverability software | #4 of 31 | #8 of 31 |
Folderly: what it does well
- Inbox Insights free plan includes 2 tests monthly.
- Pulse offers real-time alerts at no cost.
- Campaign drafts can be directed to relevant checks.
- Supports API, SMTP, and custom providers.
- Named integrations include Google Workspace and SendGrid.
What to know first
- DMARC is a pilot.
- Mirror is in beta.
- Product access and plans vary by product.
- Folderly mailbox plans have a minimum commitment.
Mail-Tester: what it does well
- Free plan includes three tests per 24 hours.
- Checks authentication settings and blocklists.
- Paid plans provide iframe and JSON API access.
- Reopening a result does not count as another test.
What to know first
- Free results remain available for 7 days.
- Passing does not guarantee inbox placement.
- No inbox placement monitoring is listed.
Alternatives to Folderly Alternatives to Mail-Tester The whole list