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SendHeron vs CodeOutbox

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

SendHeron compared with CodeOutbox
DetailSendHeron logo SendHeronCodeOutbox logo CodeOutbox
What it doesLifecycle email automation that sets itself up. You approve every word. Email marketing for developers. Paste a form, no backend, write in Markdown, run from your coding agent.
StageNot given Not given
FoundedNot given Not given
Based inBG Not given
Pricing modelFreemium Freemium
PricingStarter €19/month (up to 10,000 contacts, 50,000 emails/month), Growth €49/month (up to 40,000 contacts, 150,000 emails/month), Scale €99/month (up to 100,000 contacts, 250,000 emails/month), Max €179/month (up to 200,000 contacts, 500,000 emails/month). Free trial: 1,000 contacts and 5,000 sends fo Not given
Key features
  • AI-generated lifecycle sequences from website URL
  • Tags and segments with no separate list to sync
  • Block-based and HTML email templates
  • Unified suppression list for transactional and marketing email
  • REST API with 56 documented endpoints and scoped keys
  • Multiple workspaces and brands in one subscription
  • EU data residency with German storage
  • Agent automation with scoped tokens
  • Write campaigns in Markdown files
  • Run broadcasts from coding agent over MCP
  • Double opt-in on by default
  • Automatic domain authentication with DNS setup
  • Export subscriber data to CSV or JSON
  • Lists and campaigns stored as repository files
  • 30-day money-back guarantee on paid plans
  • SPF, DKIM, DMARC authentication
  • One-click unsubscribe and bounce suppression
What makes it different
  • AI automatically drafts lifecycle sequences from your website URL with human approval required
  • EU company with data stored in Germany and published sub-processor list
  • Unsubscribed and bounced contacts stored free
  • Built by the team running PostFast's own lifecycle email in production
  • Developer-first workflow with no dashboard required—set up forms, manage lists, and send campaigns entirely from your coding agent and repository
  • More subscribers at lower entry price than competitors: 3,000 subscribers at $9/mo vs Mailchimp ~$13 for 500 or Kit ~$25 for 1,000
  • Completely free tier with 100 subscribers and no credit card or trial clock
  • Version-controlled campaigns as Markdown files reviewed in pull requests
  • Open source platform with no backend infrastructure to maintain
Community votes00
DR (Domain Rating by Ahrefs)20 −1 (down) since last checkNot checked yet no change since last check
Trust Flow (Majestic)120
Citation Flow (Majestic)260
Referring domains (Majestic)200

4 details filled in for both companies.

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