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.

MCP Testing & Hosting

Best MCP Testing & Hosting Tools in 2026

An MCP server that works in one client can still fail in another, or confuse the model with a vague tool description. These tools let you call every tool by hand, scan it for security gaps, and publish or host a server where developers will find it. Here are the leading options in 2026, compared on what they test and how they price.

MCP Testing & Hosting Tools Compared

Tool	Pricing	Free tier
MCP Inspector	Free
MCP Playground Online	Free
Smithery	Free · paid from $10/mo

The Best MCP Testing & Hosting Tools, Ranked

1. MCP Inspector

Free tier· Free

The official open-source debugger for MCP servers: list tools, call them by hand and read the raw JSON-RPC traffic.

Official reference tool, always current with the spec
Free and open source
CLI mode scripts into CI

MCP Inspector & alternatives

2. MCP Playground Online

Free tier· Free

Browser-based MCP platform: test servers, run evals, scan against the OWASP MCP Top 10, check AI readiness and try them with 60+ models in Agent Studio.

Evals, security scan and AI readiness in one free tool
Compare 60+ models on your server in Agent Studio
Nothing to install, and hosted MCP servers in under a minute

MCP Playground Online & alternatives

3. Smithery

Free tier· Free · paid from $10/mo

The largest MCP server registry, plus hosting and managed OAuth so agents can connect to servers without running them.

Largest MCP server registry
Try any server's tools in the browser
Cheap hosting with managed OAuth

Smithery & alternatives

How to choose a mcp testing & hosting tool

Start with the official MCP Inspector. It is free, tracks the spec, and shows the raw JSON-RPC when something breaks.
Choose MCP Playground Online for evals, an OWASP MCP Top 10 security scan, an AI readiness review and side-by-side tests across 60+ models, all in the browser.
Choose Smithery to publish a server where developers already look for one, or to host it with managed OAuth for $10/month.
Testing and hosting are different jobs. Most teams pair a free inspector with a registry like Smithery rather than picking a single winner.

Frequently Asked Questions

What are the best mcp testing & hosting tools for startups in 2026?⌄

The best mcp testing & hosting tools for startups in 2026 include MCP Inspector, MCP Playground Online, Smithery. Compare them by pricing, free tiers, and features in the list above.

What is the best free mcp testing & hosting tool?⌄

Free mcp testing & hosting options include MCP Inspector, MCP Playground Online, Smithery — all offer a free tier suitable for bootstrapped startups and MVPs.

How do I choose a mcp testing & hosting tool?⌄

Start with your budget and team size, prefer tools with a free tier to validate, and make sure your pick integrates with the rest of your stack. App Stack Builder can recommend a complete, budget-aware stack in about 60 seconds.

Need the whole stack, not just mcp testing & hosting?

Get a free, AI-powered tech stack — matched to your budget, app type, and team size in 60 seconds.

Build my stack free