Sign-in, done
Email and password with verification codes, password reset, Google and GitHub sign-in, passkeys, sign-in links by email, guest accounts, and 2FA with an authenticator app. Sessions you can see and end.
How sign-in works
Open source · MIT · Deno 2 + Postgres
The groundwork of your SaaS, already built.
Seed is a free, MIT-licensed SaaS starter with sign-in and two-factor authentication (2FA), groups with roles, per-member Stripe billing, realtime, an offline app and an admin area. You deploy it with Docker Compose to a single Linux server you rent.
No sign-up. You get a guest account with demo data, and it's wiped every night. Seed is a work in progress, built in public: see what works today.
$ gh repo create my-product --template spy4x/seed --private --clone
$ cd my-product
$ deno task init
$ deno task dev
init writes infra/envs/.env with every secret filled in. Or ask your AI agent: Create my new product "Acme" from https://github.com/spy4x/seed and run it locally.
- browser test suites and test files run in CI
- 34 · 232
- pull requests merged since January 2026, each through review
- 208
- licence: no account, no paywall
- MIT
What you get
Everything before your first feature
Each part below works today and is tested in CI. Google and GitHub sign-in and Stripe billing need your own keys, so they are off in the demo.
Per-member billing
Stripe subscriptions per group: a free plan with limits, a paid plan per member, trials, a grace period when a card fails. The owner confirms the price before each invite.
How billing works
Realtime and offline
Changes reach every open tab over a WebSocket. The app installs, opens without a network, queues writes and shows a conflict instead of overwriting someone's work.
How realtime and offline work
Groups from day one
Every account gets a group at sign-up. Invite people, give them roles from viewer to owner, hand ownership over, and restore a deleted group within 30 days. Each group has an overview of its key numbers.
How groups work
An admin area
Operators find a person, manage groups, refund a payment and check the system's health. It runs on its own host; risky actions ask first, and every action is logged.
Tour the admin panelA public website
This site: server-rendered, works with JavaScript turned off, in six languages, with pricing from your plan catalog, legal pages and a double opt-in newsletter.
What the website includesRuns on one server you rent
One server, one docker compose, no surprise bills.
Seed runs on any Linux server you rent. Compose starts the API, the worker, the web app, Postgres, Valkey and Traefik with automatic certificates. Metrics and logs go to VictoriaMetrics and VictoriaLogs with Grafana on top, and a backup container saves an encrypted copy of the database every day. Several products can share one server. Nothing bills you per request, so a traffic spike costs you nothing extra.
Skip Seed if you want serverless functions or Vercel: it is built for a server you control.
Quick start
Running locally in four commands
You need Deno 2 and Docker; the GitHub CLI is optional.
init copies the env file and generates every secret and the web push keys; dev starts Traefik and everything else. Then open http://app.localhost. The README lists every setting and how to deploy.
Or ask your AI agent: Create my new product "Acme" from https://github.com/spy4x/seed and run it locally.
$ gh repo create my-product --template spy4x/seed --private --clone
$ cd my-product
$ deno task init
$ deno task dev
Honest status
Where it stands today
Seed is a work in progress. Here's exactly what works and what doesn't.
Works today
Ready- Sign-up, sign-in, email verification, password reset, Google and GitHub sign-in, passkeys, magic links, 2FA with an authenticator app
- Guest accounts: try the app with one click, keep the account by adding a sign-in method
- Groups with members, roles, invitations and ownership transfer
- Exporting a group to a file, and importing one as a new group
- Images and PDFs attached to notes, within each plan's room
- Per-member billing with trials, through Stripe
- A profile picture, the list of signed-in devices, a download of your own data, and account deletion with a 7‑day undo
- Personal API tokens
- Realtime, the offline app and web push
- A Telegram bot: notifications in a chat, and your own commands in one file
- The admin area
- The outbox worker, the newsletter and this website
- The app, the admin area and this website in six languages: English, Russian, Spanish, German, Brazilian Portuguese, and Arabic
Not built yet
In progress- An Android app in the Play Store
- A desktop app for Windows, macOS and Linux
Not a developer? I'll build your product on Seed.
I'm Anton, the person who builds Seed. Founders hire me to turn an idea into a live product that people can sign up for and pay for. Because sign-up, groups and payments already exist, your budget goes to what makes your product different.
Who builds Seed
Built by one engineer, for real client work
I'm Anton Shubin, a senior full-stack engineer and tech lead, freelancing since 2013. Seed is the groundwork I kept rebuilding for clients, pulled into one repository. I use it for paid MVPs, so it gets fixed when it breaks. If something is missing for your product, open an issue or write to me.
Questions
Before you start
Can I try it without an account?
Yes. “Try the live demo” opens the app in a guest account with demo data, no email or password needed. You can add a sign-in method, but the demo is still wiped every night. Seed itself needs no account at all: clone it from GitHub.
Is Seed really free?
Yes. It is MIT-licensed: use it for any number of products, commercial or not, publish your fork, no account needed. You pay only for one server you rent and for services you turn on, such as Stripe or an email provider.
Why Deno and Preact instead of Next.js?
They run on web standards (fetch, Request, Web Crypto, ES modules), start fast and need few dependencies, so there is less to update and less that breaks. If you work in the Next.js ecosystem, a Next.js starter will suit you better; the comparison names good ones.
Can I use it for client work?
Yes. MIT allows it, and that is how I use it. Your client needs no licence of their own.
Is it production-ready?
The parts listed under "Works today" have tests in CI: every pull request runs the sign-in, profile, notes and groups tests, and the full suite runs after each merge. Seed as a whole is still a work in progress; read the status list before you rely on a part.
See it working in a minute
The demo is the app you get on day one. Open it without signing up and explore groups full of demo notes.