Your AI agents are only as good as your codebase

Production ready TanStack Start SaaS starter kit for developers and agents. Strict types, consistent patterns, and test coverage that keep your agents on track — one-shot new features, without hand-holding.

Used by 1000+ developers

New

Playwright and Playwright MCP

Used by indie founders and established startups

Polypane

Built on TanStack Start

The fastest full-stack React framework for building dashboard-heavy SaaS products. Type-safe routing, built-in caching, and SSR when you need it.

Auth

Customizable auth system built on Better Auth, or use your own auth provider.

Auth
  • Email & password
  • Social login
  • Magic links
  • 2FA
  • RBAC
  • Email verification
  • Passkeys
  • SSO

Workspaces

Allow users to create, manage, and invite other users to their own workspaces.

  • RBAC
  • Multi-tenancy
  • Block workspaces
  • Invite users
  • Manage roles

Billing

Built-in billing with Stripe, or use your own billing provider. Automatically sync your billing configuration with Stripe.

Billing
  • Subscriptions
  • Automatic Stripe setup
  • Tiered pricing
  • Metered pricing
  • Usage-based pricing
  • Entitlements
  • Pricing tables
  • Grandfathering

Database

Built on the world's most proven database. PostgreSQL managed by Drizzle ORM. Run it locally, use Supabase, or on the edge with Neon..

Database
  • PostgreSQL
  • Migrations & seeding
  • Optimized queries
  • Edge-ready

API

End-to-end typesafe API with tRPC. Built fast without breaking anything. Fully portable, run it in a route function or fully standalone as your backend grows.

API
  • Type-safe
  • React Query integration
  • Permissions & roles
  • Subscriptions (Live data)
  • SSR & RSC support

Beautiful UI

Meticulously crafted theme that works with Chakra UI and Panda CSS. Built-in components, hooks, and utilities that work together seamlessly.

Beautiful UIBeautiful UI
  • Customizable token system
  • Pre-built components
  • Storybooks
  • Accessible

Transactional Emails

Beautiful, easily customisable transactional emails. Integrate with Resend, or use your own SMTP provider.

Transactional EmailsTransactional Emails
  • Built-in templates
  • Template editor
  • Custom SMTP support

Testing & Linting

End-to-end and unit testing setup for agent back pressure, ship with confidence.

Testing & LintingTesting & LintingTesting & Linting
  • Playwright
  • Vitest
  • Github Actions

Architecture matters more than ever.

AI agents can now scaffold an entire app in minutes. But here's what most people are discovering the hard way: generated code without solid architecture becomes an unmaintainable mess just as fast. The bottleneck was never typing speed — it's the foundation you're building on.

I originally created Saas.js to help developers and designers ship high quality apps with speed on solid foundations. In an agentic world, this became even more important. AI can generate code at scale, but it needs well-structured, composable building blocks and guardrails to produce anything worthwhile.

Saas.js gives you that foundation. A production-ready starter kit with the architecture, patterns, and guardrails that let your agents ship features one-shot — without hand-holding. Everything from auth to billing to UI, built once and built right.

The teams shipping fastest aren't the ones generating the most code — they're the ones with the strongest foundations. Your time is better spent on what makes your product unique, not debugging the output of yet another prompt.

EW
Eelco WiersmaFounder Saas.js

Loved by developers and designers

SH

Simon Høiberg

Founder - Aidbase

“At Aidbase, we're developing a framework-agnostic component library to support our various chatbots, ticket forms, and other widgets. It's challenging building something that's a great developer experience and performing well at the same time. SaaS UI has been a massive help in this.”
MN

Muhammad Saad Naeem

Sovanza

“What I love most about Saas UI is the fantastic customer support and seamless integration. Their support team is responsive and genuinely helpful, always ready to assist whenever I needed guidance or ran into any issues. This level of support made a huge difference, giving me confidence and peace of mind as I worked through my project. The component library is not only extensive but also incredibly intuitive, which allowed me to focus on creating great features rather than worrying about UI complexities. Saas UI helped me launch my project faster than I expected without sacrificing quality or design. If you're looking to elevate your project’s UI with the backing of an amazing support team, I highly recommend Saas UI!”
A

Ahmed

Founder - LocalXpose

“I really recommend SaaSUI to any developer or team seeking a robust, visually appealing, and easy-to-implement UI framework. The support and updates from the SaaSUI team were exceptional, Thank you. ”
MS

Makenna Smutz

Founder - Heron

“Amazingly well thought-out set of components. I snagged them and have been able to create beautiful and functional UI super quick! This filter UI is some of my favorite 🤤”
@

@moshyfawn

Software Engineer - React Hook Form

“Imagine a well thought out SaaS UI with super cool integrations like @HookForm @chakra_ui and @date_fns that power the whole thing! Like WAT?!”
MA

Michael Andreuzza

Founder - Lexington Themes

“I've watched Saas UI grow over time, and you can really see the care that goes into it. Every update feels purposeful. It's the kind of product you instantly recognize as being built by someone who truly gets SaaS.”
IK

Ilia Kulikov

Founder

“Working with Saas UI and Eelco is amazing: straightforward process, friendly and professional, at an affordable pricing. Delivery time is excellent. Highly recommend SaaS UI and Eelco as a professional developer and one of the best boilerplates out there. ”
TT

Tien Thinh

Software Engineer

“Saas UI is the ONLY template out there that does the code structure that I think can scale 😄”
MS

Milan van Schaik

CTO - CultureKit

“In order to be able to build beautiful portals in an efficient way, we were we looking for a turnkey solution, with enough flexibility. SaaS UI is exactly what we were looking for. Eelco is very thoughtful. We had factored in that early adopting comes with some risk - but so far all any issues are quickly remedied and there are almost weekly new useful features for us!”
FB

Felipe Barcelos

CTO - NotifyLog

“The SaaS UI was key to building my SaaS platform on NextJS. It allowed me to create my platform's UI quickly and easily, with many pre-made components that saved me a lot of development time. Also, the SaaS UI is very flexible and can be easily customized to suit my specific needs.”
J

Juyoung

Frontend developer

“Thanks to SaaS UI, frontend web development has become much faster, allowing me to focus more on business logic, which is fantastic. I have a feeling that it will significantly grow in the coming years. Thank you.”
JB

JuanPablo B.

UX Designer & Front-end Developer

“What SaaS UI exceeds at, is that it is not a project fully based on commercial purposes but real passion for user interfaces. You can tell that from the get go. Nowadays it is really hard to find projects that are pixel-perfect oriented and crafted with so much care and attention to detail. Most projects are run by code developers and not so much from skilled designers.”
JT

João Tosto

Founder - Startec

“Saas UI is one of the most exciting dev tools I've tried so far. The pre-built components allow me and my team to develop our products much more easily and faster than traditional ways. If you are a single developer, a startup trying to launch a new product or even a scaling-up company, I strongly recommend Saas UI.”
KP

Kai Pradel

Founder - Inkubator

“At Inkubator we build Saas companies and SaasUI is our go-to UI kit at the beginning of every project. Not only are the components beautiful and intuitive but the community is also highly engaged and supportive.”
@

@simonweniger

Software Engineer - Mintgate

“SaasUI is really great and helps me to focus on the core part for the mvp instead of spending time on the framework. I really enjoyed the dev experience in the first days.”
JL

Jacob Leuthardt

Founder - Frantic Software

“SaaS UI has let my business hit the ground running. Good UI is the foundation of good software and SaaS UI is what makes good software. Before SaaS UI, my UI was hand written in plain HTML/CSS/JS. Now it's an eye-catching experience that turns heads.”

Start shipping features today.

Buy nowRead the docs

30% off for a limited time