Marketplace Starter is the full source code behind a real, production-grade marketplace for listings-based platforms (goods, services, rentals) — Next.js + Supabase + Tailwind. Clone it, rebrand it, ship it.
One-time payment · full source code · yours forever · no subscription
Why it pays for itself
Even with AI doing the heavy lifting, rebuilding this plumbing yourself is weeks of an engineer's time plus tooling — easily thousands. Here it's already done, tested and running in production.
automated tests (Vitest) — typed, linted, build-gated
full source code — no black boxes, no SaaS lock-in
Everything's already wired
Months of the boring, critical engineering every marketplace needs, done for you.
Email + Google OAuth, Row-Level Security, admin 2FA (TOTP), dual captcha, rate limiting, audit log, GDPR delete.
Pending → published → rejected workflow, edit-as-revision, tiers, promotions with auto-expiry, boosts & vanity slugs.
Reviews with anti-fraud detection, favorites, web push notifications, and a cost-capped AI support chat.
Cloudinary pipeline with render-time watermarking, in-browser image editor and client-side compression.
Hand-tuned mobile and desktop layouts — not a squished desktop site. Ships with a polished dark mode + light theme.
Dynamic sitemap, JSON-LD, canonicals, IndexNow, multi-language i18n and multi-currency with live exchange rates.
Sentry, Vercel Analytics, Resend email, encrypted off-site backups + restore runbook, 6 scheduled cron jobs.
Pluggable identity verification (add-on). Private RLS-scoped storage with encrypted off-site backups.
Preview
An illustrative preview of the marketplace you can ship — browsing, listings and a full admin panel. Explore the real thing in the live demo.
Illustrative UI previews. The live demo runs the real boilerplate.
Simple, one-time pricing
Pay once. Own the source forever. Add payments and identity verification when you're ready.
Secure checkout by Lemon Squeezy — Merchant of Record. Pay by card, Apple Pay or Google Pay · VAT & invoicing handled.
Identity add-on also available separately — $29 USD. Get it
Stories & Reviews add-on also available separately — $29 USD. Get it
Good to know
The complete source code of the Marketplace Starter boilerplate (Next.js + Supabase + Tailwind), delivered as access to a private GitHub repository. You can clone it, rebrand it and deploy it to your own infrastructure.
After purchase you'll receive a license key and instructions by email. Reply with your GitHub username and we'll add you as a collaborator to the private repository within 24 hours.
The Single Developer license lets you use the code on your own projects. The Agency / Unlimited license lets you use it on unlimited client projects. Reselling the boilerplate itself is not permitted.
No. The base kit is fully functional. Payments (multiple gateways + crypto) and identity verification are optional add-ons, delivered as separate repos that drop into the base kit when you need them.
Checkout is handled by Lemon Squeezy as Merchant of Record (they handle invoicing and VAT). Because this is instant-access source code, sales are generally final — reach out if anything's wrong and we'll make it right.
Right here — every kit and add-on checks out securely through Lemon Squeezy, our Merchant of Record, straight from this page. You can also browse the full catalog on the Kelflow store at kelflow.lemonsqueezy.com. We're adding more marketplaces over time.
The kit is delivered as source code for you to implement and deploy on your own infrastructure. Kelflow isn't liable for code that's misimplemented, modified or breached (security incidents) once it's in your hands. We only take responsibility for what Kelflow implements and maintains directly — that is, our services, not the products we ship as source code.
Yes — email us anytime at contact@kelflow.com. We answer setup and deployment questions.
Stop rebuilding the same plumbing. Get the full source for $89.
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