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.

Langflow vs Mastra: Which is Better in 2026?

Name: App Stack Builder
Availability: InStock

Agent Framework

Choosing between Langflow and Mastra? Both are popular agent framework tools. Below we compare them on pricing, free tiers, features, and pros & cons so you can pick the right fit for your stack.

Langflow is for: Teams who want to build and test agent and RAG flows visually, then serve them as APIs or MCP servers.

Mastra is for: TypeScript teams that want agents, workflows, memory, evals and observability in one framework instead of assembling them.

Quick verdict

There’s no single winner; pick on your constraint. Choose Langflow if you want to prototype agent or RAG flows visually before writing code. Choose Mastra if you work in TypeScript and want workflows, memory and evals included.

Langflow vs Mastra — Side by Side

	Langflow	Mastra
Category	Agent Framework	Agent Framework
What it is	Visual builder for agent and RAG flows	Code library: TypeScript agent framework with workflows
Languages	Visual editor; Python components	TypeScript
Licence	MIT	Apache 2.0 core; enterprise features under a separate licence
Managed / paid option	Self-host or Langflow Desktop	Mastra Cloud: free Starter, Teams $250/month
Project status	Active; 1.x	Active; 1.x
Pricing	Free	Free · then usage-based
Starting price	Free tier available	Free tier available
Free tier
Rating	3.9	4.6
Best for	Agent Framework — visual builder, RAG prototyping, MCP servers	Agent Framework — TypeScript agents, workflows and memory, batteries included

Pros & Cons

Langflow

Fastest way to prototype a chain visually
Exports to code rather than trapping you
Free and self-hostable

Visual editing gets unwieldy past a certain size
Versioning a flow is harder than versioning code

Mastra

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

Younger than Python frameworks
TypeScript-only ecosystem

Key Features Compared

Langflow

Drag-and-drop builder for agents and RAG flows
Flows served as APIs, and exposable as MCP servers
Works as an MCP client as well
Self-host it, or run Langflow Desktop locally
Owned by IBM through its DataStax acquisition
MIT licence

Mastra

Agents, a graph-based workflow engine and memory in one package
Built-in evals and observability
MCP support for sharing tools
Mastra Cloud: free Starter, Teams at $250 a month, Enterprise on quote
Apache 2.0 core; enterprise features under a separate Mastra Enterprise Licence

Choose Langflow if…

You want to prototype agent or RAG flows visually before writing code.
Non-developers on your team need to edit flows.
You want flows exposed as APIs or MCP servers without extra code.

Langflow review & pricing

Choose Mastra if…

You work in TypeScript and want workflows, memory and evals included.
You want an optional managed cloud from the same team.
You want MCP tool sharing built in.

Mastra review & pricing

Frequently Asked Questions

Is Langflow better than Mastra?⌄

What is the difference between Langflow and Mastra?⌄

What it is — Langflow: Visual builder for agent and RAG flows. Mastra: Code library: TypeScript agent framework with workflows. Languages — Langflow: Visual editor; Python components. Mastra: TypeScript. Licence — Langflow: MIT. Mastra: Apache 2.0 core; enterprise features under a separate licence. Managed / paid option — Langflow: Self-host or Langflow Desktop. Mastra: Mastra Cloud: free Starter, Teams $250/month.

Langflow vs Mastra: which is cheaper?⌄

Langflow pricing: Free. Mastra pricing: Free · then usage-based. Confirm current pricing on each tool's official site, as plans change.

Which is rated higher, Langflow or Mastra?⌄

In our catalog, Langflow rates 3.9 out of 5 and Mastra rates 4.6 out of 5, so Mastra has a slight edge on reviews.

When should I skip both Langflow and Mastra?⌄

Skip Langflow if your flows will grow large and need code review and versioning. A code library such as LangGraph is easier to manage. Skip Mastra if your team writes Python. LangGraph or CrewAI fit better.

Sources · tool facts checked October 2026