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day3

Who it's for

Built for small software teams. Not marketing departments.

day3 is email marketing and transactional email for people whose actual job is shipping product. If that's you, find your situation below.

Startups

You add subscribers quickly and send sparingly. day3 bills by send, not list size, so a fast-growing list never inflates the bill.

See why

Indie developers

Email your users about what's new, without paying per subscriber or learning a marketing platform. Built for a team of one.

See why

SaaS teams

Changelogs and release notes are a job of their own. day3 does that one job well, with deliverability and compliance built in and pricing that ignores list size.

See why

What all three have in common

A startup, a solo developer and a SaaS team look different on an org chart and identical on an invoice. Four things are true of all of them, and they're the reason day3 is priced and shaped the way it is.

Your list grows faster than your sending does
Signups arrive in bursts. Sending is gated by how often you ship something worth announcing. Per-subscriber pricing charges for the first curve; day3 charges for the second.
Email is a channel, not a department
Nobody on the team is a marketer. The tool has to be usable on the afternoon you need it, without a platform to learn first or a sales call before you can send.
The app already sends email
Password resets, receipts, magic links. Running those through the same verified domain and the same monthly allowance as your updates means one reputation to keep clean instead of two.
Getting compliance wrong is expensive
One-click unsubscribe, recorded consent, automatic suppression of bounces and complaints. These are not features you want to discover you needed after Gmail starts filing you as spam.

Questions

Who is day3 built for?
Small software teams who send product updates: startups, indie developers and solo founders, and SaaS teams shipping release notes. The common thread is a list that grows faster than the sending schedule, and no marketer on staff.
Who is day3 not for?
Marketing teams running funnels, and agencies managing client accounts. There's no A/B testing, no CRM, no landing pages, no multi-account layer, and automations are designed but not shipped. If you need a marketing platform, buy a marketing platform.
Do I need to be a developer to use day3?
No. Verifying a domain is the only technical step, and connecting Cloudflare means day3 publishes the DNS records for you. The API and MCP server are there if you want them, not a prerequisite for sending.
Does day3 work for a non-software business?
It'll send email perfectly well, but the product is shaped around product updates and transactional mail. If you're running seasonal promotions, e-commerce flows or lead nurture, a generalist tool fits better.

Where to go next

One model, whatever you're building.

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