Build a SaaS with a coding agent.

In-app notifications for Next.js on Supabase: a notifications table with RLS, inserts from server code, an unread list and live updates with Realtime.

Magic link login for Next.js with Supabase Auth: signInWithOtp, a token-hash confirm route, email codes as a backup and custom SMTP for production.

Add passkey sign-in to a Next.js app with Supabase Auth: set the relying party, opt in on the client, register a passkey, then sign in with no email.

Send email from Next.js with the Resend API and route Supabase Auth emails through Resend SMTP: API key, verified domain, React Email and limits.

Set up Supabase with Next.js 16: packages, env vars, browser and server clients, proxy.ts session refresh. Then: build or buy the rest of your SaaS?

Add Stripe embedded checkout to a Next.js app on Supabase: ui_mode embedded_page, a Server Action, a return page and a webhook that grants access.

Polar vs Stripe vs Lemon Squeezy: who handles VAT and sales tax, fees as of October 2026, payouts, license keys, and which suits a solo founder.

React Native vs Flutter for a SaaS phone app: language, rendering, Supabase, over-the-air updates, store builds and code shared with Next.js.

A SaaS product launch checklist in 15 groups: domain, production setup, sign-in, email, payments, security, legal, SEO, speed, monitoring and launch.

Seven SaaS pricing page examples from October 2026: plans, toggles, highlighted plans, free tiers, FAQs and sales links, plus a checklist for yours.