Sign-in that is done
Email and password with verification codes, password reset, Google and GitHub sign-in, passkeys, 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 to one Linux server you rent with Docker Compose.
No sign-up. The demo opens as a guest account with sample data, and it is 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, restore a deleted group for 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. On its own host, with every action confirmed and logged.
Tour the admin panelA public website
This site: server-rendered, works with JavaScript turned off, 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 is exactly what works and what does not.
Works today
Ready- Sign-up, sign-in, email verification, password reset, Google and GitHub sign-in, passkeys, 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
- Per-member billing with trials, through Stripe
- The list of signed-in devices, and account deletion with a 7‑day undo
- Personal API tokens
- Realtime, the offline app and web push
- The admin area
- The outbox worker, the newsletter and this website
Not built yet
WIP- Magic links
- Translations: the app is English only
- File uploads: no file store is bundled yet
- Downloading an account's data
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 sample data, without an email or a password. Add a sign-in method to keep it; the demo is wiped every night either way. 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 start in groups full of sample notes.