| What it does | Email marketing and transactional email, billed by what you send
| Autonomous QA agent for email that checks copy, links, images, accessibility and brand guidelines, then issues a certificate anyone can verify
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| Stage | Startup
| Startup
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| Founded | 2026
| 2026
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| Based in | DK
| CA
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| Pricing model | Freemium
| Paid
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| Pricing | Free tier: $0/mo with 100 emails/month to your own team. Paid plans start at $1/mo for 1,000 emails/month: 1k ($1), 5k ($3), 10k ($5), 25k ($8), 50k ($14), 100k ($25), 250k ($60), 500k ($115), 1,000,000 ($220). All plans include unlimited subscribers and AI writing assistant.
| Team: $299 per Member per month (2 clients, 30 emails); Pro: $988 per month (unlimited clients and emails). One paid Member seat unlocks full team access; Reviewer and Client viewer seats are free on every plan.
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| Key features | - Campaigns with simple compose and send workflow
- Automations with canvas-based workflows
- Unlimited audiences with filtering
- Signup forms with multiple install methods
- Email authentication with DKIM, SPF and DMARC
- Metrics for deliverability and engagement
- AI writing assistant for drafts and rewrites
- REST API and MCP for integration
- Hard monthly send cap with no overage charges
- Cloudflare DNS integration for domain setup
| - Copy vs Deck Alignment - reads copy deck and holds email to it line by line in both directions
- Link Validation - opens every URL, follows tracking wrappers to actual landing page, checks destination against deck
- Creative Comparison - checks built email block by block against approved PDF, PNG, JPG or XD
- Real Outlook Rendering - renders every email in real Outlook 365 on Windows in light and dark mode
- Accessibility (WCAG 2.1) - 25 accessibility checks including contrast, alt text, heading structure, reading order
- SendLint Approved Certificates - mints certificate for each email and language with public verification page
- Compliance PDF and Audit Log - keeps every report, check, approval, override and waiver with who, when and reason
- Dynamic content with personalization tokens - placeholders resolve against test values to verify exactly
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| What makes it different | - Built in the EU, hosted in the EU with full GDPR compliance
- Focused product with essential features only, no platform bloat
- Free tier with 100 real sends per month for testing
- Transparent pricing with no hidden fees or launch price
| - Autonomous agent that signs off on emails with verifiable certificates, not just approvals
- Checks whether what you built matches what the client approved, not just how it looks
- Hands each defect to the person who fixes it with exact quotes from deck and email
- Real Outlook rendering on actual Windows machines, not a simulation
- Works with any ESP - takes HTML or .eml you would send from any platform with no setup changes
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 8 ● no change since last check | Not checked yet ● no change since last check |
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| Trust Flow (Majestic) | 5 | 0 |
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| Citation Flow (Majestic) | 27 | 19 |
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| Referring domains (Majestic) | 37 | 4 |
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day3
SendLint