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.

Infrastructure as CodeFree tier

OpenTofu: Pricing, Features & Alternatives

OpenTofu was forked from the last MPL-licensed Terraform after HashiCorp's 2023 licence change. Gruntwork, Spacelift, Harness, env0 and Scalr started it, and it is now stewarded by the Linux Foundation. Your existing HCL, providers and state files work unchanged. On top of that it has shipped things Terraform users asked for: client-side state encryption with AWS KMS, GCP KMS or a passphrase (1.7), an `-exclude` flag and `for_each` on provider blocks (1.9). The current release is 1.13. It is free with no commercial tier, so the only cost is the CI and state bucket you run it from.

OpenTofu Pricing Plans (2026)

Plan	Price	Highlights
Open sourcePopular	$0 (MPL 2.0, self-run)	Drop-in compatible with Terraform HCL and state · 3,900+ providers, 23,600+ modules · Built-in state encryption

Pricing summary: Free. Always confirm current pricing on the official site.

Key OpenTofu Features

Drop-in compatible with Terraform HCL and state
3,900+ providers, 23,600+ modules
Built-in state encryption
Provider for_each and -exclude

Pros

+Truly open source under the Linux Foundation
+Migrating from Terraform is usually a binary swap
+State encryption is built in rather than bolted on

Cons

−No first-party hosted runner, so you bring CI or a TACO
−Newer Terraform-only features will not always land here
−Smaller community than Terraform, though growing

Best OpenTofu Alternatives

Compare all

Terraform

Free · then usage-based

Pulumi

Free · paid from $40/mo

AWS CloudFormation

Free

OpenTofu Compared

OpenTofu vs Terraform OpenTofu vs Pulumi OpenTofu vs AWS CloudFormation

OpenTofu FAQ

What is OpenTofu used for?⌄

OpenTofu is a infrastructure as code tool. The open-source fork of Terraform under the Linux Foundation. It is a drop-in replacement that has since added features Terraform lacks, such as built-in state encryption.

Is OpenTofu free?⌄

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

How much does OpenTofu cost?⌄

OpenTofu is free to use.

What are the best OpenTofu alternatives?⌄

Popular OpenTofu alternatives include Terraform, Pulumi, AWS CloudFormation. Compare pricing and features on our OpenTofu alternatives page.