What is App Stack Builder?

App Stack Builder is a free AI-powered tool that helps founders and developers choose the right tech stack for their projects based on budget, app type, team size, and skill level.

What is the best tech stack for SaaS in 2026?

The best tech stack for SaaS in 2026 typically includes Next.js 16 for frontend, Supabase for database and auth, Vercel for hosting, Stripe for payments, and PostHog for analytics. App Stack Builder can generate a personalized recommendation based on your specific budget and requirements.

Is App Stack Builder free to use?

Yes, App Stack Builder is completely free to use. You can generate unlimited tech stack recommendations without any cost.

What types of apps can I build with the recommended stacks?

App Stack Builder supports various app types including SaaS applications, web apps, mobile apps, e-commerce stores, internal tools, and AI/ML products.

How much does a SaaS tech stack cost per month?

A modern SaaS tech stack can cost anywhere from $0-50/month for bootstrapped startups using free tiers, $100-300/month for growth-stage startups, to $500+/month for enterprise-ready infrastructure. App Stack Builder helps you find the best tools within your specific budget.

What is the best tech stack for solo founders?

For solo founders, we recommend Next.js + Vercel (free), Supabase (free tier), Supabase Auth (free), Stripe (pay as you go), and Plausible or PostHog for analytics. This stack can run your entire SaaS for under $50/month.

Can I export my tech stack recommendations?

Yes, you can export your tech stack recommendations as a PDF document or copy them to your clipboard. You can also share a link to your stack with others.

AuthFree tier

Clerk: Pricing, Features & Alternatives

Clerk provides drop-in authentication, user management, organizations, and session handling for modern applications. It is especially popular with React and Next.js teams due to its excellent developer experience and built-in UI components.

Clerk Pricing Plans (2026)

Plan	Price	Highlights
FreePopular	$0 / month	First 10,000 monthly active users included · Usage-based pricing for additional MAUs · Email & password authentication
Pro	$25 / month	Everything in Free · Up to 100,000 monthly active users · Advanced organizations & roles
Enterprise	Custom pricing	Everything in Pro · Unlimited MAUs · SSO (SAML, OIDC)

Pricing summary: Free · paid from $25/mo. Always confirm current pricing on the official site.

Key Clerk Features

First 10,000 monthly active users included
Usage-based pricing for additional MAUs
Email & password authentication
Social logins
User management dashboard
Prebuilt UI components
Basic organizations support
Community support

Pros

+Excellent developer experience
+Prebuilt auth UI saves time
+Strong Next.js and React integration
+Handles organizations and roles well

Cons

−Pricing scales with MAUs
−Vendor lock-in for auth flows
−Less flexible for highly custom auth logic

Best Clerk Alternatives

Compare all

NextAuth.js

Free

SuperTokens

Free · paid from $0.02/mo

Auth0

Free · paid from $35/mo

Firebase Authentication

Free

Clerk Compared

Clerk vs NextAuth.js Clerk vs SuperTokens Clerk vs Auth0 Clerk vs Firebase Authentication

Clerk FAQ

What is Clerk used for?⌄

Clerk is a auth tool. Complete authentication and user management platform for modern web applications.

Is Clerk free?⌄

Yes — Clerk has a free tier you can start with, and paid plans for more usage and features.

How much does Clerk cost?⌄

Clerk offers a free tier, with paid plans starting at $25/month. Some plans are usage-based (pay-as-you-go).

What are the best Clerk alternatives?⌄

Popular Clerk alternatives include NextAuth.js, SuperTokens, Auth0, Firebase Authentication. Compare pricing and features on our Clerk alternatives page.

Not sure if Clerk fits your stack?

Get a free, AI-powered tech stack tailored to your budget, app type, and team size — including the best auth pick for you.

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