Email marketing
day3
Email marketing and transactional email, billed by what you send
Email marketing tool for startups and indie developers that charges by emails sent rather than subscriber count, with unlimited subscribers on every plan
Overview
The day3 homepage
day3 is an email marketing and transactional email platform designed for startups, indie developers, and SaaS teams. It bills by the number of emails sent rather than by subscriber count, with unlimited subscribers on every plan. The service includes campaigns, automations, signup forms, deliverability features with domain authentication, metrics tracking, an AI writing assistant, and a full REST API with MCP support. Features are focused on core functionality: writing and sending emails, welcome series automation, audience management, and compliance built in, without A/B testing, landing pages, or marketing platform complexity.
Capabilities
- 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
Pricing
Pricing model: Freemium
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.
Follow day3 to get an email when they post a milestone, ship a new product or add a demo video.
day3 fact sheet
| Community votes | 0 |
|---|---|
| Founded | 2026 |
| Stage | Startup |
| Based in | Herning, Denmark |
| Website | day3.app |
day3 metrics
Vendor metrics for day3.app: Ahrefs Domain Rating and Majestic link data, with the delta since the last review.
- Domain Rating
- 8
- no change since last check
- Trust Flow
- 5
- no change since last check
- Citation Flow
- 27
- no change since last check
- Referring domains
- 37
- no change since last check
- External backlinks
- 127
- no change since last check
Vendor Domain Rating (Ahrefs) checked 6 Nov 2026, spec changed 1 Nov 2026. Vendor topic: Business/Financial Services (4). Vendor Majestic data checked 1 Nov 2026, spec changed 1 Nov 2026. Link metrics supplied by Majestic. Trust Flow, Citation Flow and Topical Trust Flow are trademarks of Majestic-12 Ltd.
day3 vendor domain
Open the vendor record
We read this from the registry's RDAP record on 5 Nov 2026, 21:58 UTC.
- Domain age
- 7 months
- Registered
- Expires
- Registrar
- CloudFlare, Inc.
- DNSSEC
- Not signed
day3 post-launch report
| Measure | At launch, then latest |
|---|---|
| Domain Rating (Ahrefs) | 8 to 8 no change since launch 1 Nov 2026, then 5 Nov 2026 |
| Trust Flow (Majestic) | 5 first measured 1 Nov 2026 |
| Referring domains (Majestic) | 37 first measured 1 Nov 2026 |
Day 4 since launch. Next receipt: day 30, 1 Dec 2026. Many things move these figures, so a change is not proof of cause. Only stored readings are shown.
About to launch?
Plan your launch with our free playbook, from preparing your listing to choosing more launch directories.
- The week before
- On the day
- Week one
- Beyond launch
Compare and explore
See the alternatives to day3, Premail vs day3, Neural Newsletters vs day3, ZEPIC vs day3, Truelist vs day3, Recurrr vs day3, MailSenseAI vs day3, more in Email marketing.
Buyer questions
Can I try it before paying?
Yes. You can verify a domain, import a list, and send 100 real emails per month to your own team for free through the same pipeline with the same tracking. Reaching your full audience starts at $1/mo.
What counts as a send?
One email to one subscriber counts as one send. A campaign sent to 1,000 people uses 1,000 emails from your monthly allowance.
Do unused emails roll over to the next month?
No. Your monthly allowance resets each billing period. You can change plans whenever to match your sending rhythm.
What happens if I exceed my monthly send limit?
Sending pauses cleanly at your cap with no surprise charges. You can upgrade to a higher plan to continue sending.
Is the AI writing assistant included in all plans?
Yes, the AI writing assistant is included on every paid plan starting at $1/mo. It can draft campaigns from briefs, generate subject lines, and rewrite copy.
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day3 has a free listing. The owner can unlock the full profile with a paid launch for $5:
- Founder story (locked)
- Milestones (locked)
- Demo video (locked)
- Dofollow website link (locked)
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