Builder Kit
Free AI Tools Guide.
A curated list of developer APIs, cloud databases, and hosting tiers to build AI agents and web apps at zero expense.
LLM Provider15 RPM / 1M tokens per day free
Google AI Studio & Gemini API
Get access to Gemini 1.5 Pro and Flash with massive 2M token context windows for zero cost using their developer API keys.
Hosting & FrameworksHobby plan with free TLS, edge functions
Vercel & Next.js
Deploy serverless Next.js web applications, prompt endpoints, and vector search pages globally in seconds.
Database & Vectors2 free projects (500MB database space)
Supabase Vector (pgvector)
Store text chunk embeddings, run semantic search operations, and manage student credentials using PostgreSQL.
Agent FrameworksOpen-source under MIT License
LangChain & LangGraph
Orchestrate agentic workflows, cyclical loops, tool-calling structures, and system fallbacks with clean packages.