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SarvStack
AGENT-READYVAT HANDLEDSHIP IN A WEEKEND

The agent-ready SaaS starter for TanStack Start

VAT handled, ship in a weekend. Auth, billing, database patterns, and the CLAUDE.md conventions your coding agent needs — all in one repo.

Built foragent-ready development
See pricing Read the FAQ
This site runs on the kit
src/routes/api/webhooks/polar.ts
// src/routes/api/webhooks/polar.ts
const rawBody = await request.text();
const ok = await verifyStandardWebhook({
  id: request.headers.get("webhook-id")!,
  timestamp: request.headers.get("webhook-timestamp")!,
  signatureHeader: request.headers.get("webhook-signature")!,
  body: rawBody,
  secret: process.env.POLAR_WEBHOOK_SECRET!,
});
if (!ok) return new Response("Invalid signature", { status: 401 });
 
const event = JSON.parse(rawBody) as PolarEvent;
if (shouldRunPaidEffects(event)) {
  await deliverEmail(orderConfirmationEmail(event));
  await recordAudit("order.paid", event.data.customer.id, event.data);
}
Built with
TanStack StartReactTypeScript strictSupabasePolarTailwind CSSshadcn/uiTanStack StartReactTypeScript strictSupabasePolarTailwind CSSshadcn/ui

By the numbers

Honest counts from the repository you'll clone.

  • 0+
    Features shipped
  • 0 h
    Estimated build time saved
  • 0 langs
    Languages built in
  • 0+
    Automated tests
WHAT'S INSIDE

Highlights

Six of the twenty-one patterns shipped in the kit — see the full grid on the features page.

TanStack Start

SSR, type-safe file-based routing, and server functions out of the box.

Supabase auth

Email + password, password reset, and a reusable route guard for protected pages.

Profiles + RLS pattern

Auto-created profile rows and a documented Row-Level Security template you copy for every new table.

Polar billing (MoR)

Merchant-of-record checkout — EU/UK VAT and US sales tax handled without extra code.

AI module

Lovable AI gateway wired server-side with a reusable pattern — works out of the box, no external keys.

Teams / Organizations

New

Create orgs, invite members with tokenized 7-day links, owner/admin/member roles, last-owner guard, and RLS that extends transparently to shared projects.

See all 21 features →
INSIDE THE REPO

Inside the repo

Real code from the codebase you'll clone — nothing invented.

supabase/migrations/…_projects.sql
create table public.projects (
  id uuid primary key default gen_random_uuid(),
  user_id uuid not null references auth.users(id) on delete cascade,
  name text not null,
  description text,
  created_at timestamptz not null default now(),
  updated_at timestamptz not null default now()
);
 
grant select, insert, update, delete on public.projects to authenticated;
grant all on public.projects to service_role;
 
alter table public.projects enable row level security;
 
create policy "select own" on public.projects
  for select to authenticated using (auth.uid() = user_id);
create policy "insert own" on public.projects
  for insert to authenticated with check (auth.uid() = user_id);
PROOF, NOT TESTIMONIALS

See it in action

Real screenshots from the running kit — auth, dashboard, checkout and more.

sarvstack.sarvon.ch
SarvStack landing page hero section
Proof, not testimonials

This site is the demo

sarvstack.sarvon.ch itself runs on SarvStack. The auth you can try via Sign up, the checkout on /pricing, the dark mode toggle — all shipped kit code.

Try the live authSee the checkout
FREQUENT QUESTIONS

Frequently asked questions

The top three questions. Full list on the FAQ page.

Read all questions →
READY TO SHIP

Ready to ship?

One purchase. Lifetime access. VAT handled by Polar.

$99 early adopter price — goes to $149 on August 1, 2026. Buying before then locks lifetime updates at the lower price.

See pricing