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.

Internal Tools & Admin PanelsFree tier

Windmill: Pricing, Features & Alternatives

Windmill is the internal-tools platform for teams that would rather write code than drag widgets: you commit a script, and Windmill generates the form, the API endpoint, the schedule and the permissions around it, with a flow editor for chaining steps. Self-hosting is free and unlimited; the enterprise licence starts around $120/month for audit logs, SAML and support.

Windmill Pricing Plans (2026)

Plan	Price	Highlights
Open sourcePopular	$0 — self-hosted, unlimited executions	Scripts in Python, TypeScript, Go, Bash · Auto-generated UIs and APIs · Flow editor and cron
Enterprise	From $120 / month ($20 / developer + $50 / worker)	Audit logs · SAML and uncapped SSO · Distributed dependency cache

Pricing summary: Free · paid from $120/mo. Always confirm current pricing on the official site.

Key Windmill Features

Scripts in Python, TypeScript, Go, Bash
Auto-generated UIs and APIs
Flow editor and cron
Community support

Pros

+Scripts stay code, in your repo
+Fast worker runtime
+Free and unlimited self-hosted
+Covers workflows and cron as well as UIs

Cons

−Developer-first — not for non-technical builders
−You operate the workers
−Smaller integration library

Best Windmill Alternatives

Compare all

Retool

Free · paid from $10/mo

Appsmith

Free · paid from $15/mo

Budibase

Free · paid from $19/mo

ToolJet

Free · paid from $79/mo

Softr

From $19/mo

Windmill Compared

Windmill vs Retool Windmill vs Appsmith Windmill vs Budibase Windmill vs Softr Windmill vs ToolJet

Windmill FAQ

What is Windmill used for?⌄

Windmill is a internal tools & admin panels tool. Open-source developer platform that turns scripts in Python, TypeScript, Go or Bash into internal UIs, workflows and cron jobs.

Is Windmill free?⌄

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

How much does Windmill cost?⌄

Windmill offers a free tier, with paid plans starting at $120/month.

What are the best Windmill alternatives?⌄

Popular Windmill alternatives include Retool, Appsmith, Budibase, ToolJet, Softr. Compare pricing and features on our Windmill alternatives page.

Not sure if Windmill fits your stack?

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

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