Listed alphabetically. A tool is ranked by its reviews once it has 3.
| Tool | Reviews | Lowest paid plan | Free plan | Free trial | Public API | Runs on | Main features |
|---|---|---|---|---|---|---|---|
 dmarcianGives internet domain owners control over their email domains with DMARC. | ReviewsNone yetWrite one for dmarcian | Lowest paid plan$24per month, billed monthlyBasic, as of November 14, 2026 | Free planYes | Free trial30 days | Public APIYes | Runs onNot confirmed | Main features
|
 PowerDMARCA complete DMARC service for email authentication, deliverability, reputation, and DNS compliance. | ReviewsNone yetWrite one for PowerDMARC | Lowest paid plan$8per month, from $8 for 50,000 emails per month, up to $250Basic, as of November 14, 2026 | Free planYes | Free trial15 days | Public API | ||
 Sublime SecurityAgentic email security tailored to your organization. | ReviewsNone yetWrite one for Sublime Security | Lowest paid planNot confirmed | Free planYes | Free trialNot confirmed | Public APIYes | Runs onNot confirmed | |
 ValimailAutomated DMARC, DKIM, and SPF email authentication to stop phishing and spoofing. | ReviewsNone yetWrite one for Valimail | Lowest paid planSee plans | Free planYes | Free trialNot confirmed | Public APINot confirmed | Runs onNot confirmed | Main features |
From each tool's own website. “Not confirmed” means we couldn't confirm it there, not that the tool doesn't have it. Each tool's page says when its facts were checked.
How this list is made
A tool is listed here only when we've confirmed on its own website that it has a free plan. Tools we couldn't confirm it for are left out, even if they may have it. Vendors can't pay for a place on this list. Add a tool we missed