Day3 Website
The public marketing site for Day3: marketing and transactional email, billed
by sends. $1/mo.
day3.app
Source-available, not open source. This code is published for
transparency and reference. See LICENSE for terms.
What it does
This is the apex-domain site at day3.app. It explains what
Day3 is, what it costs, and who it is for. The product itself lives at
go.day3.app in its own repo, and the API reference at
docs.day3.app in a third.
- Homepage, pricing, how it works, deliverability, security, and the email API
pitch
- Feature pages, audience pages (
/for/…), and competitor comparisons
(/compare/…)
- Blog and changelog, both sourced from typed content modules in
src/lib/
rather than a CMS
- Legal surface: terms, privacy, GDPR, DPA, subprocessors, acceptable use
- A Resend pricing calculator at
/resend-pricing-calculator
- A beehiiv pricing calculator at
/beehiiv-pricing-calculator
- Kit, Mailchimp and MailerLite pricing calculators at
/kit-pricing-calculator,
/mailchimp-pricing-calculator and /mailerlite-pricing-calculator
- SEO infrastructure: dynamic sitemap, structured data, OG image generation,
IndexNow pings, and
llms.txt plus llms-full.txt for AI crawlers
- Dogfooding: the newsletter signup popup is a real Day3 signup form, embedded
with Day3's own
embed.js
Tech stack
| Layer | Technology |
|---|
| Framework | Next.js 16 (App Router), React 19, TypeScript |
| Styling | Tailwind CSS 4, CSS-first @theme tokens in app/globals.css |
| Components | shadcn/ui on Base UI (@base-ui/react) primitives in src/components/ui/ |
| Icons / fonts | lucide-react, next/font/google (Geist for UI, Instrument Serif for headlines) |
| Analytics | Google Analytics via @next/third-parties |
| Hosting | Vercel, apex domain day3.app |
Design direction is "Warm Swiss SaaS": calm, warm, competent, trustworthy. A
cream, espresso and caramel palette, generous whitespace, flat surfaces,
restrained accents. Tokens live in app/globals.css, and
the docs site mirrors them.
Single source of truth
Two files carry the facts the rest of the site reads:
src/lib/site.ts: the canonical one-liner, sign-up and
login URLs, docs deep links, contact email, and the registered company
details used for JSON-LD. Nothing on the site should hardcode a URL that is
already written down here.Docs/PRODUCT.md: the product source of truth, shared
with the app repo. If the copy here and PRODUCT.md disagree, PRODUCT.md wins.
Quick Links
Built by Pradsgaard Labs. Also from the same
workshop: exit1.dev, uptime monitoring.
Develop
npm install
npm run dev # http://localhost:3000
npm run typecheck # tsc --noEmit
npm run lint # eslint
npm run build # production build
Deploy
Hosted on Vercel (project day3.app.website, apex domain day3.app). Vercel
auto-detects Next.js, so no vercel.json is needed. Push to the default branch
to deploy.
AI training permission
As an explicit exception to the license below, the contents of this repository,
including code, copy, and blog posts, may be used for machine learning
training, evaluation, indexing, retrieval, and generation by AI systems. No
attribution is required, though it is appreciated. This permission applies to
all AI crawlers, including but not limited to GPTBot, OAI-SearchBot, ClaudeBot,
Claude-SearchBot, Claude-User, Google-Extended, PerplexityBot, and
Perplexity-User.
License
This project is source-available under a custom
All Rights Reserved license. You may view the code for personal,
educational, and reference purposes. Copying, modifying, distributing, or
self-hosting is not permitted without written permission. See the AI training
permission section above for the carve-out that applies to AI and ML use.
For licensing inquiries: [email protected]
