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GrowSurf vs Email Spam Tester

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

GrowSurf compared with Email Spam Tester
DetailGrowSurfEmail Spam Tester
What it doesReferral program software that turns your customers into your lowest-cost growth channel Test real inbox placement and 42 technical checks with no signup required
StageEstablished Established
FoundedNot given 2026
Based inUS Not given
Pricing modelsubscription freemium
PricingReferral programs: Startup plan $125/mo billed yearly (or $179/mo monthly) for up to 2,500 participants; Business plan $314/mo billed yearly (or $449/mo monthly) for up to 10,000 participants. Affiliate programs: Free plan at $0/mo plus 3% success fee on referral revenue. All plans include 14-day fr Not given
Key features
  • Automatic link generator
  • Copy and paste integration
  • Fast setup time
  • Fully white-labeled
  • AI-powered optimization
  • Automatic rewards
  • Flexible reward types
  • REST API and SDKs
  • Analytics dashboard
  • 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
What makes it different
  • Launch in days, not weeks without heavy engineering
  • Pricing based on participants, not total user base
  • Trusted by healthcare, fintech, and software teams
  • 312% average return on investment
  • 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
Free planNot given Not given
Open sourceNot given Not given
PlatformsNot given Not given
Public APINot given Not given
Community votes00
DR (Domain Rating by Ahrefs)74 no change since last check18 no change since last check
Trust Flow (Majestic)2717
Citation Flow (Majestic)3525
Referring domains (Majestic)152535

5 details filled in for both companies.

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