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.

All launches

Security & Passwordsapps.apple.comJul 21, 2026

Folder Lock Vault

Name: App Stack Builder
Availability: InStock

Lock sensitive Mac folders in a local AES-256 vault

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About

Folder Lock Vault is a focused macOS utility for protecting selected folders inside local AES-256 encrypted sparsebundle vaults. It is designed for client files, finance folders, project deliveries, personal archives, and other local material that should remain locked between work sessions. Choose a source folder and vault location, set a passphrase, and the app copies the contents into the encrypted vault. It verifies that the encrypted copy succeeds before moving the original folder to Trash, preserving a recovery path until the Trash is emptied. Unlocking mounts the vault so it appears in Finder like a normal folder; relocking unmounts it. Everything remains local, with no account, cloud upload, or recurring subscription. The Mac App Store price is HK$38 as a one-time purchase. The passphrase cannot be recovered, so it must be stored safely. Anyone evaluating the workflow should use only a newly created disposable sample folder—never the sole copy of important files—and report the macOS version, Mac type, vault location, exact reproduction steps, and any warning that was unclear. Free TestFlight access has been prepared but must not be described as joinable until Apple approves the current beta build.