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

Auth0: Pricing, Features & Alternatives

Auth0 is a managed authentication and identity platform that provides secure login, user management, SSO, MFA, and enterprise integrations. It is designed for teams that need scalable, production-ready authentication with strong security and compliance requirements.

Auth0 Pricing Plans (2026)

Plan	Price	Highlights
FreePopular	Free	Up to 25,000 monthly active users (MAUs) · Custom domains · Passwordless authentication (Email, SMS, Passkeys, OTP)
Essentials	$35 / month	Everything in Free · Higher authentication and API limits · Multi-Factor Authentication (OTP, Duo)
Professional	$240 / month	Everything in Essentials · Use existing user database for logins · Advanced MFA (Phone, Email, WebAuthn, Push)
Enterprise	Custom pricing	Everything in Professional · Custom user and SSO tiers · 99.99% SLA

Pricing summary: Free · paid from $35/mo. Always confirm current pricing on the official site.

Key Auth0 Features

Up to 25,000 monthly active users (MAUs)
Custom domains
Passwordless authentication (Email, SMS, Passkeys, OTP)
Unlimited social connections
Basic security features
Supports any application type
Secure agentic and AI workflows

Pros

+Enterprise-ready authentication
+Highly scalable and reliable
+Strong MFA and security features
+Supports complex SSO and org models
+Wide ecosystem and integrations

Cons

−Can get expensive at scale
−Pricing complexity with MAU-based billing
−Less flexible than self-hosted auth solutions

Best Auth0 Alternatives

Compare all

Clerk

Free · paid from $25/mo

NextAuth.js

Free

SuperTokens

Free · paid from $0.02/mo

Firebase Authentication

Free

Auth0 Compared

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

Auth0 FAQ

What is Auth0 used for?⌄

Auth0 is a auth tool. Enterprise-grade authentication and authorization platform with advanced security, SSO, and identity management.

Is Auth0 free?⌄

Yes — Auth0 has a free tier you can start with, and paid plans for more usage and features.

How much does Auth0 cost?⌄

Auth0 offers a free tier, with paid plans starting at $35/month. Some plans are usage-based (pay-as-you-go).

What are the best Auth0 alternatives?⌄

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

Not sure if Auth0 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.

Build my stack free