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.

LLM Provider

Best LLM API Providers in 2026

The model behind your AI features shapes quality and cost. Here are the best LLM API providers in 2026, compared on capabilities, pricing, and ecosystem.

LLM Provider Tools Compared

Tool	Pricing	Free tier
Google Gemini API	Free
Mistral AI API	Free
Grok API (xAI)	Free
Anthropic Claude API	Usage-based	—
OpenAI API	Usage-based	—

The Best LLM Provider Tools, Ranked

1. Google Gemini API

Free tier· Free

Google's Gemini API — multimodal AI models with the largest context window and competitive pricing for high-volume applications.

Largest context window (1M+ tokens)
Competitive pricing
Free tier for prototyping

Google Gemini API & alternatives

2. Mistral AI API

Free tier· Free

European open-weight LLM API with strong coding models, function calling, and a free tier via La Plateforme.

Best open-weight models for self-hosting
Codestral excels at code completion
GDPR-compliant EU infrastructure

Mistral AI API & alternatives

3. Grok API (xAI)

Free tier· Free

xAI's Grok API — real-time internet access, large context window, and competitive pricing for AI-powered apps.

Real-time web search built in
OpenAI-compatible — easy migration
Competitive pricing vs GPT-4

Grok API (xAI) & alternatives

4. Anthropic Claude API

· Usage-based

Anthropic's Claude API — state-of-the-art language models for coding, reasoning, and content generation.

Best-in-class code generation
Largest context window
Prompt caching reduces cost

Anthropic Claude API & alternatives

5. OpenAI API

· Usage-based

OpenAI's API providing access to GPT-4o, o1, and other frontier models for text, code, images, and embeddings.

Largest LLM ecosystem
Widest range of models
Extensive SDK support

OpenAI API & alternatives

How to choose a llm provider tool

Anthropic Claude leads for long-context reasoning and agentic coding.
OpenAI offers a broad, mature ecosystem and tooling.
Compare per-token input/output pricing against your expected volume.
Consider latency, rate limits, and data-handling policies for production.

Frequently Asked Questions

What are the best llm provider tools for startups in 2026?⌄

The best llm provider tools for startups in 2026 include Google Gemini API, Mistral AI API, Grok API (xAI), Anthropic Claude API, OpenAI API. Compare them by pricing, free tiers, and features in the list above.

What is the best free llm provider tool?⌄

Free llm provider options include Google Gemini API, Mistral AI API, Grok API (xAI) — all offer a free tier suitable for bootstrapped startups and MVPs.

How do I choose a llm provider 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 llm provider?

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

Build my stack free