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.

Authorization & PermissionsFree tier

OpenFGA: Pricing, Features & Alternatives

Name: App Stack Builder
Availability: InStock

OpenFGA models permissions as relationships ("user X is an editor of folder Y, and editors of a folder can view its documents") and answers check, list and expand queries quickly at scale. It was created by the Auth0 team at Okta, has powered Auth0 FGA in production since 2021, and became a CNCF incubating project in 2025. It has about 6,000 GitHub stars, SDKs for the main languages, a modelling language with a playground, and Postgres, MySQL or SQLite storage.

The engine is free under Apache-2.0; what you pay for is running it: a small service plus a database, and the time to design your authorization model. Auth0 FGA is the hosted, commercial version for teams that do not want to operate it, priced through Auth0 sales. As of October 2026.

OpenFGA Pricing Plans (2026)

Plan	Price	Highlights
Open sourcePopular	Free (Apache-2.0)	Self-hosted engine · Postgres, MySQL or SQLite · SDKs and modelling playground
Auth0 FGA (managed)	Contact sales	Hosted by Okta · Built on OpenFGA · Enterprise support

Pricing summary: Free · paid plans by quote. Always confirm current pricing on the official site.

Key OpenFGA Features

Self-hosted engine
Postgres, MySQL or SQLite
SDKs and modelling playground
Check, list-objects and expand APIs

Pros

+Free and vendor-neutral under the CNCF
+Zanzibar-style model scales to sharing and nested resources
+Managed path through Auth0 FGA

Cons

−Relationship modelling has a learning curve
−You run and monitor the service yourself
−No built-in admin UI for non-engineers

Best OpenFGA Alternatives

Compare all

SpiceDB

Free · then usage-based

Cerbos

Free · paid from $25/mo

Permit.io

Free · paid plans by quote

OpenFGA Compared

OpenFGA vs Cerbos OpenFGA vs SpiceDB OpenFGA vs Permit.io

OpenFGA FAQ

What is OpenFGA used for?⌄

OpenFGA is a authorization & permissions tool. Open-source (Apache-2.0) relationship-based authorization engine inspired by Google Zanzibar, a CNCF incubating project created by Auth0/Okta. Free to self-host; Auth0 FGA is the managed version.

Is OpenFGA free?⌄

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

How much does OpenFGA cost?⌄

OpenFGA is free to use, with usage-based pricing on some features.

What are the best OpenFGA alternatives?⌄

Popular OpenFGA alternatives include SpiceDB, Cerbos, Permit.io. Compare pricing and features on our OpenFGA alternatives page.