A complete multi-tenant SaaS foundation with organisations, roles and billing seams already wired.
Every SaaS rebuilds the same four things before it can sell anything: an ownership model, roles, billing seams and a settings surface. This kit ships all four, built the way the UT Studio platform itself is built — an Organization owns everything, entitlements are separate from payment state, and nothing is coupled to a specific payment provider.
Atlas is the interactive demo built on this kit: the overview, projects, team and billing screens, running here with sample data. No account needed.
Open the Atlas demoOrganisation settings with role management
Video is not yet available for this product.
Personal accounts convert to teams without a migration. Owner, admin, billing and member roles, with invitations.
Feature access is derived from entitlements. A failed payment does not lock a customer out mid-deployment.
Provider callbacks are persisted before processing, uniqued on the provider event id. Duplicate webhooks cannot double-charge.
Domain events commit with the change that caused them, so a side effect is never silently lost.
Every consequential action recorded with actor, diff and reason. Retrofitting this is close to impossible.
Strict TypeScript with no escape hatches, and business rules as pure functions with exhaustive tests.
Every purchasable thing belongs to an Organization rather than a User, so converting a personal account into a team is a flag change and an invitation rather than a data migration. Payment providers sit behind one interface, and authorization is derived from entitlements rather than read from payment state — which is what lets you change provider without touching the code that guards features.
User ──< Membership >── Organization ──1:1── BillingProfile
│
├──< Subscription ──▶ Entitlement
└──< Invoiceapps/
web/ Next.js application
packages/
core/ errors · result · logger · money · ids
db/ Prisma schema · repositories
services/ domain services (billing, org, entitlement)
ui/ design tokens and primitives
config/ every tunable valueThe archive contains the full source. There is no installer and no post-install script.
unzip saas-starter-kit.zip
cd saas-starter-kitpnpm installCopy the example file and fill in the variables listed under Environment variables.
cp .env.example .envpnpm devRuns formatting, lint, type-check, tests and a production build.
pnpm check| Variable | Required | Description |
|---|---|---|
DATABASE_URL | Required | PostgreSQL connection string. Use a pooled endpoint in serverless environments.postgresql://user:pass@localhost:5432/app |
NEXT_PUBLIC_APP_URL | Required | Absolute origin of the deployment. Used for canonical URLs and metadata.https://app.example.com |
LOG_LEVEL | Optional | debug | info | warn | error. Defaults to info in production. |
STRIPE_SECRET_KEY | Optional | Only needed once billing is enabled. The kit runs fully without it. |
Tiers are rows, not code. Add one by inserting a policy with the dimensions it confers.
packages/db/prisma/seed.tsColour, spacing, radius and motion are CSS custom properties. Rebranding is a one-file change.
packages/ui/src/styles/theme.cssEvery optional surface is behind a flag from the day it is built, so turning one off is a row rather than a search.
packages/ui/src/lib/features.tsZero-config. Set the environment variables listed above and connect the repository.
A multi-stage Dockerfile is included, producing a standalone image with no build toolchain.
Builds to a standard Node server. Nothing depends on a platform-specific runtime.
| Technology | Versions | Status |
|---|---|---|
| Next.js | ≥ 15 < 17 | Supported |
| React | ≥ 19 | Supported |
| PostgreSQL | ≥ 14 | Supported |
| Node.js | ≥ 22.12 | Supported |
| Next.js | 14.x | Deprecated Works, but the App Router caching model differs. Support ends with 3.0. |
| Pages Router | any | Not supported The kit is App Router only. |
Seat reassignment cooldown and a rebuilt invitation flow.
Seat reassignment cooldown and a rebuilt invitation flow.
Organisation-owned model. A breaking change with a migration guide.
Security fix in session rotation.
The kit ships its own tokens; this replaces them with the full component set.
≥ 14Metered entitlements with an aggregation window.
Enterprise identity via the existing AuthIdentity seam.
Signed CSV and JSON export for compliance review.
It includes the interface, the webhook inbox and the entitlement projection — everything that is expensive to get right. The provider SDK call is deliberately left to you, because which provider you use is a business decision the kit should not make.
Yes, on Pro and above. The Free tier is personal and non-commercial.
No. The kit is App Router only, and the compatibility table above states that explicitly rather than leaving it to be discovered.
Curated by us, not inferred — these are the ones that genuinely pair with it.
Products that share a framework with this one.