Email Spam Tester vs Sender

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

Email Spam Tester compared with Sender
Detail	Email Spam Tester	Sender
What it does	Test real inbox placement and 42 technical checks with no signup required	Email marketing platform for growing businesses
Stage	Established	Established
Founded	2026	2012
Based in	Not given	LT
Pricing model	freemium	freemium
Pricing	Not given	Not given
Key features	Real inbox placement testing in Gmail, Outlook, Yahoo and more 42 technical checks across authentication, infrastructure, content and compliance SPF, DKIM and DMARC verification Blocklist lookup across 20+ DNS blocklists SpamAssassin-compatible spam score Link reputation checking HTML structure analysis Bulk sender rules for Gmail and Yahoo compliance Fix plan with recomputed score for corrections API and MCP server integration options	Email automation workflows SMS marketing campaigns Landing page builder Segmentation and personalization Transactional emails via API and SMTP A/B testing Analytics and reporting Popup and signup forms
What makes it different	Two independent spam engine scores instead of one, including Gmail and Yahoo 2024 bulk sender rules Fix plan recomputes points by scoring corrected message rather than estimating No account, signup or credit card required to run tests Built by practitioner with years of live sending infrastructure debugging experience	Unified platform for email, SMS, and transactional messages
Free plan	Not given	Not given
Open source	Not given	Not given
Platforms	Not given	Not given
Public API	Not given	Not given
Community votes	0	0
DR (Domain Rating by Ahrefs)	18 no change since last check	84 no change since last check
Trust Flow (Majestic)	17	43
Citation Flow (Majestic)	25	53
Referring domains (Majestic)	35	10122

6 details filled in for both companies.

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