THE MAINFRAME BOILERPLATE

Launch your app.
No downtime.

The premium SaaS boilerplate that gives your startup a bold, high-converting presence from day one. Built with taste, shipped with speed.

Get Started See Features

Features

Everything you need to launch

Ship faster with pre-built components, auth flows, billing integration, and polished UI that converts.

⚡

Lightning Fast

Optimized builds with edge deployment. Sub-second load times out of the box.

🔒

Auth & Security

Multi-provider auth with JWT sessions, RBAC, and enterprise-grade security built in.

💳

Billing Ready

Stripe integration with subscription management, usage billing, and customer portal.

🎨

Themeable

Five stunning themes with dark mode support. Customize colors, fonts, and spacing.

📈

Analytics

Built-in analytics dashboard with real-time metrics, funnels, and conversion tracking.

🤖

AI Powered

Pre-wired AI endpoints with streaming, tool use, and multi-model support.

Developer Experience

Configure in minutes

A single configuration file controls your entire SaaS. Theme, billing, auth, features — all in one place.

Type-safe configuration with full IDE support
Hot-reload during development
Environment-aware defaults
Zero boilerplate to get started

// mantle.config.ts
export default defineConfig({
  name: "My SaaS",
  theme: "mainframe",
  auth: {
    providers: ["google", "github"],
    session: "jwt",
  },
  billing: {
    provider: "stripe",
    plans: ["starter", "pro"],
  },
  features: {
    analytics: true,
    ai: true,
  },
})

Themes

Five themes. One vision.

Each theme is a complete design system crafted for a different brand personality. Switch instantly.

K-Pop

Vibrant gradients and playful energy. Perfect for consumer apps, creator tools, and brands that want to stand out with bold color.

Brutalist

Raw, honest, unapologetic. Monospaced type, hard borders, and stark contrast for dev tools and technical products.

Minimal

Clean lines and generous whitespace. A refined, understated aesthetic for professional SaaS and enterprise products.

Testimonials

Loved by builders

Hear from developers and founders who ship faster with MantleKit.

"MantleKit saved us three months of frontend work. The Bold theme converted 40% better than our custom design."

Sarah Chen

Technical Co-Founder

"I've tried every SaaS boilerplate. MantleKit is the only one where I didn't feel the need to rewrite the CSS."

Marcus Rivera

Independent Builder

"The theme switcher alone is worth it. We A/B tested three themes and found our winner in a week."

Aisha Patel

Head of Growth, NexusAI

Pricing

Simple, transparent pricing

No hidden fees. No per-seat charges. Pay once, ship forever.

Starter

$49 /one-time

All 5 themes
Auth & billing integration
Basic analytics
Community support
Lifetime updates

Get Starter

Pro

$149 /one-time

Everything in Starter
AI endpoints & streaming
Advanced analytics
Priority support
Custom theme builder
Multi-tenancy support

Get Pro

Blog

Latest from the blog

Insights on building, launching, and scaling your SaaS.

Engineering

Why we chose WebGL for theme effects

A deep dive into our decision to use WebGL2 aurora effects and the performance wins we found.

Mar 15, 2026 · 5 min read

Launch

From zero to $10K MRR in 60 days

How three founders used MantleKit to launch, iterate, and hit their first revenue milestone.

Mar 8, 2026 · 8 min read

Design

The psychology behind dark UI themes

Dark themes aren't just trendy. The science behind why they convert better for SaaS products.

Feb 28, 2026 · 6 min read

FAQ

Frequently asked questions

Quick answers to common questions.

MantleKit is built with Next.js 14, TypeScript, Tailwind CSS, and Prisma. It supports PostgreSQL and SQLite out of the box.

Absolutely. Themes are fully interchangeable. Change a single config value and your entire site updates. No migration needed.

Yes. Both Starter and Pro plans include lifetime access to all future updates, new themes, and improvements.

Team

Meet the Team

The builders behind MantleKit.

Alex Lawson

Founder & CEO

Full-stack engineer with a decade of experience building developer tools. Obsessed with performance.

Maya Kapoor

Head of Design

Previously at Linear and Figma. Believes great design should be bold, intentional, and unforgettable.

Jordan Chen

Lead Engineer

TypeScript purist and open-source contributor. Architect of the theme engine and CLI tooling.

Comparison

How We Compare

See why developers choose MantleKit over the rest.

Feature	MantleKit	Others
Production-ready themes	✓ 5 themes	✗ 1–2 basic
Config-driven architecture	✓	✗
Multiple payment providers	✓ Stripe, LS, Polar	✗ Stripe only
Static & database modes	✓	✗
E-commerce module	✓	✗
One-time pricing	✓ From $49	✗ Subscription

Roadmap

Our Journey

Where we've been and where we're headed.

Q1 2026

Project Launch

Initial release with 3 themes, auth, payments, and MDX blog engine.

Q2 2026

E-commerce & 5 Themes

Full e-commerce module and two additional themes: Corporate and Creative.

Current

CLI Setup & Theme Library

Interactive CLI setup and curated theme previews for faster project starts.