Mayoyo Starter
π₯ The SaaS Starter That Actually Ships
"Stop debugging bleeding-edge tech conflicts. Start building features that matter."
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π The Bleeding Edge Nightmare
You know this pain:
- β Tailwind v4 breaks your entire design system overnight
- β React 19 concurrent features break your forms
- β Next.js 15 App Router + Turbopack throws cryptic errors
- β Stripe webhooks fail silently in production
- β Supabase SSR hydration mismatches crash your app
- β PostHog + React 19 = duplicate event tracking hell
The brutal reality? Even senior devs spend 3+ months just getting the latest tech stack to play nice together.
β‘οΈ Latest Tech Stack (Actually Working)
Cutting-Edge Frontend
What's Actually Included
- Next.js 15 with Turbopack (dev server in <200ms)
- React 19 with proper concurrent features
- Tailwind v4 (no more config headaches)
- TypeScript 5 with strict mode
- Supabase SSR (no hydration errors)
- Stripe 18.2 with latest webhook handling
- PostHog analytics (React 19 compatible)
- Vitest testing suite (launching soon)
SSR-First Architecture
β
Server Components by default
β
Client components only when needed ('use client')
β
Zero hydration mismatches
β
Perfect Lighthouse scores
β
No "useState during SSR" errors
π‘οΈ The Integration Hell We Solved
Latest Tech Nightmare Our Battle-Tested Solution Tailwind v4 breaking everything Pre-configured with @tailwindcss/postcss
v4 setup React 19 form actions not working Proper useTransition
+ useActionState
implementation Next.js 15 middleware auth errors SSR-compatible auth with @supabase/ssr
Stripe webhooks + App Router issues Event handlers in /api/webhooks
with proper error boundaries PostHog React 19 conflicts Custom provider with concurrent-safe event tracking Zustand + SSR hydration bugs Store persistence with SSR-safe serialization
π¬ Technical Deep Dive
Why This Stack Actually Works
1. Tailwind v4 Properly Configured
// package.json - The exact versions that work
"@tailwindcss/postcss": "^4",
"tailwindcss": "^4",
"@tailwindcss/typography": "^0.5.16"
2. React 19 + Next.js 15 Harmony
// Server Actions that actually work
export async function createSubscription(formData: FormData) {
'use server'
// Proper concurrent features implementation
const result = await stripe.subscriptions.create({...})
revalidatePath('/billing')
}
3. SSR-First Supabase Auth
// No more "useUser is not defined" errors
export async function createClient(useServiceRole = false) {
const cookieStore = await cookies()
if (useServiceRole) {
// Service role client bypasses RLS - use for webhook operations
return createServerClient(
process.env.NEXT_PUBLIC_SUPABASE_URL!,
process.env.SUPABASE_SERVICE_ROLE_KEY!, // This bypasses RLS
{
cookies: {
getAll() {
return cookieStore.getAll()
},
setAll(cookiesToSet) {
try { ...
4. Zero-Config PostHog + React 19
// providers/posthog.tsx - Concurrent-safe analytics
export function PostHogProvider({ children }: PropsWithChildren) {
// Proper provider setup with React 19 compatibility
}
π¦ Complete Production File Structure
Every page and API route you need(all with a simple out of the box setup):
βββ app/ β Next.js 15 App Router directory
β βββ account/ β User account management section
β β βββ billing/ β Account billing management
β βββ api/ β API routes (server-side endpoints)
β β βββ contact/ β Contact form handler
β β βββ stripe/ β Stripe API endpoints
β β βββ webhooks/ β Webhook handlers (Stripe, etc.)
β βββ auth/ β Authentication flow pages
β β βββ confirm/ β Email confirmation
β β βββ error/ β Auth error handling
β β βββ forgot-password/ β Password reset flow
β β βββ login/ β Login page
β β βββ sign-up/ β Registration
β β βββ sign-up-success/ β Post-registration
β β βββ update-password/ β Password update
β βββ billing/ β Billing & subscription management
β β βββ invoices/ β Invoice history
β β βββ payment-methods/ β Card management
β β βββ portal/ β Stripe customer portal
β βββ blog/ β Blog section
β β βββ [slug]/ β Dynamic blog posts (CMS)
β β βββ page.tsx β Blog listing page
β βββ dashboard/ β User dashboard
β β βββ page.tsx β Dashboard main page
β βββ pricing/ β Pricing page
β β βββ page.tsx β Pricing plans display
β βββ protected/ β Protected routes example
β β βββ layout.tsx β Protected section layout
β β βββ page.tsx β Protected page content
β βββ studio/ β Sanity CMS admin interface
β β βββ [[...tool]]/ β Catch-all route for Sanity Studio
β βββ success/ β Payment success page
β β βββ page.tsx β Success confirmation UI
β βββ support/ β Support/help page
β β βββ page.tsx β Support content & contact
β βββ error.tsx β Global error boundary
β βββ favicon.ico β Site favicon
β βββ global-error.tsx β Root error boundary
β βββ globals.css β Global CSS styles
β βββ layout.tsx β Root layout component
β βββ loading.tsx β Global loading UI
β βββ not-found.tsx β 404 page
β βββ page.tsx β Homepage component
β βββ template.tsx β Page template wrapper
βββ components/ β Reusable React components
βββ lib/ β Utility functions & configurations
βββ providers/ β React context providers
βββ public/ β Static assets (images, icons, etc.)
βββ sanity/ β Sanity CMS schemas & config
βββ store/ β Zustand state management
βββ types/ β TypeScript type definitions
βββ .env.local β Environment variables (local)
βββ .gitignore β Git ignore patterns
βββ .prettierignore β Prettier ignore patterns
βββ components.json β Shadcn/ui components config
βββ eslint.config.mjs β ESLint configuration
βββ instrumentation-client.ts β Client-side monitoring setup
βββ middleware.ts β Next.js middleware (auth & routing)
βββ next-env.d.ts β Next.js TypeScript declarations
βββ next-sitemap.config.js β Auto sitemap generation config
βββ next.config.ts β Next.js configuration
βββ package-lock.json β NPM dependency lock file
βββ package.json β Project dependencies & scripts
βββ postcss.config.mjs β PostCSS configuration
βββ README.md β Project documentation
βββ sanity.cli.ts β Sanity CLI configuration
βββ sanity.config.ts β Sanity CMS configuration
βββ structure.txt β Project structure documentation
βββ tsconfig.json β TypeScript configuration
That's 25+ pre-built pages and API routes - everything from auth flows to billing management to CMS integration.
β οΈ The Version Compatibility Matrix
The versions that actually work together:
{
"next": "15.3.3", // β Latest stable
"react": "^19.0.0", // β Release candidate
"tailwindcss": "^4", // β Beta (but stable)
"@supabase/ssr": "^0.6.1", // β SSR-compatible
"stripe": "^18.2.1", // β Latest webhook API
"posthog-js": "^1.249.5" // β React 19 compatible
}
We spent 1000+ hours finding the exact combination that doesn't break.
π― Perfect for Developers Who
Want bleeding-edge tech without the bleeding
Need to ship fast with the latest features
Can't afford 3 months debugging version conflicts
Demand SSR-first performance
"I tried upgrading to Next.js 15 + React 19 myself. Unsuccessfully, spent 3 weeks just getting it working. This starter saved me from going insane."
β Alex Rodriguez, Full-Stack Dev
π What You Actually Get
Battle-Tested Integrations
- β Stripe subscriptions with proper webhook handling
- β Supabase auth with SSR (no hydration errors)
- β Sanity CMS (with optional live preview)
- β PostHog analytics (React 19 compatible)
- β Resend emails with React Email templates
- β Tailwind v4 with zero config needed
Pages That Work Out-of-the-Box
Complete Authentication System:
-
/auth/login
β Magic links + OAuth providers -
/auth/sign-up
β User registration with email verification -
/auth/confirm
β Email confirmation handling -
/auth/forgot-password
β Password reset flow -
/auth/update-password
β Secure password updates -
/auth/error
β Auth error handling with fallbacks
Full Billing Infrastructure:
-
/billing/portal
β Stripe Customer Portal integration -
/billing/invoices
β Invoice history and downloads -
/billing/payment-methods
β Credit card management -
/account/billing
β Account-level billing settings -
/success
β Post-payment confirmation page -
/pricing
β Dynamic pricing from Stripe
Content Management:
-
/blog/[slug]
β CMS-powered blog posts with SEO -
/studio/[[...tool]]
β Full Sanity CMS admin interface -
/dashboard
β User analytics and account management -
/support
β Help and support pages -
/protected
β Example protected route with middleware
API Infrastructure:
-
/api/webhooks/*
β Stripe webhook handlers (tested) -
/api/stripe/*
β Payment processing endpoints -
/api/contact
β Contact form submission handler
Performance Optimizations
- β Turbopack dev server (<200ms startup)
- β Server Components by default
- β Optimal bundle sizes
- β Perfect Lighthouse scores
- β Zero client-side JavaScript waste
π° The Real Cost
DIY "Latest Tech" Approach:
- 80+ hours debugging Next.js 15 + React 19: $8,000
- 40+ hours getting Tailwind v4 working: $4,000
- 60+ hours fixing SSR hydration issues: $6,000
- 30+ hours Stripe + Supabase integration: $3,000
- Total: $21,000+ in dev time
This Starter: $199 ($299 for setup assistance)
Plus your sanity intact.
π What You're Really Buying
The latest tech stack that actually works together:
- β Next.js 15 + React 19 (no conflicts)
- β Tailwind v4 (properly configured)
- β Supabase SSR (zero hydration errors)
- β Stripe webhooks (tested with real events)
- β PostHog analytics (React 19 compatible)
- β TypeScript 5 (strict mode working)
- β Vitest testing suite (coming soon)
This is bleeding-edge tech that doesn't make you bleed.
π Get Started in Minutes
1. git clone [repo-url]
2. cp .env.example .env.local # Add your API keys
3. npm install
4. npm run dev --turbopack # <200ms startup
5. Visit /studio to set up CMS
6. Deploy to Vercel (one click)
No version conflicts. No integration hell. No weekend debugging.
Ready to build with the latest tech that actually works?
30-day money-back guarantee. If you spend more than 4 hours debugging version conflicts, we'll refund you.
β οΈ Warning: If you enjoy spending nights debugging React 19 hydration errors, this probably isn't for you.
Skip 3 months of setup hell - Production-ready Next.js 15 SaaS starter with Supabase auth, Stripe payments, Sanity CMS, PostHog analytics, and everything configured so you can launch in days, not months.