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.

Agent FrameworkFree tier

Mastra: Pricing, Features & Alternatives

Mastra is a TypeScript framework for building AI agents and AI-powered applications, built by the team behind Gatsby. It bundles agents, a graph-based workflow engine (.then/.branch/.parallel), a memory system, evals, and observability, with MCP tool sharing and OpenAI-compatible access to thousands of models. It hit 1.0 in January 2026 and is, alongside Vercel AI SDK, the leading choice for TypeScript teams. Free and open-source, with an optional hosted Mastra Cloud platform.

Mastra Pricing Plans (2026)

Plan	Price	Highlights
Open SourcePopular	$0 (open source)	TypeScript-native agents & workflows · Memory & semantic recall · Evals & observability
Mastra Cloud	Usage-based (hosted)	Deploy agents & workflows · Hosted observability & tracing · Server adapters (HTTP endpoints)

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

Key Mastra Features

TypeScript-native agents & workflows
Memory & semantic recall
Evals & observability
MCP tool sharing
3,300+ models via providers

Pros

+Best-in-class for TypeScript teams
+Batteries-included (agents, workflows, memory, evals)
+From the experienced Gatsby team
+Strong observability & MCP support

Cons

−Younger than Python frameworks
−TypeScript-only ecosystem

Best Mastra Alternatives

Compare all

Pydantic AI

Free

Vercel AI SDK

Free

LangChain

Free · paid from $39/mo

LangGraph

Free

LlamaIndex

Free

OpenAI Agents SDK

Free

Mastra Compared

Mastra vs Pydantic AI Mastra vs Vercel AI SDK Mastra vs LangChain Mastra vs LangGraph Mastra vs LlamaIndex Mastra vs OpenAI Agents SDK

Mastra FAQ

What is Mastra used for?⌄

Mastra is a agent framework tool. Open-source TypeScript agent framework from the Gatsby team — agents, workflows, memory, and observability in one modern stack.

Is Mastra free?⌄

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

How much does Mastra cost?⌄

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

What are the best Mastra alternatives?⌄

Popular Mastra alternatives include Pydantic AI, Vercel AI SDK, LangChain, LangGraph, LlamaIndex. Compare pricing and features on our Mastra alternatives page.

Not sure if Mastra fits your stack?

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