The barrier to building AI-powered applications has never been lower. In 2025, a remarkable ecosystem of free tools, generous free tiers, and open-source libraries lets solo developers and early-stage startups build production-quality AI apps without spending a dollar on tooling.
Free AI Coding Assistants
GitHub Copilot Free Tier
GitHub offers a free tier with 2,000 completions per month. Copilot integrates directly into VS Code, JetBrains IDEs, and the GitHub web editor.
Free tier: 2,000 completions/month + 50 chat messages/month
Cursor (Free Tier)
An AI-first code editor built on VS Code offering 50 free Sonnet requests per month. Its Composer feature for multi-file edits makes it especially powerful for full-stack AI apps.
Free tier: 50 slow requests/month
Cline (VS Code Extension, Open Source)
An open-source AI coding assistant for VS Code that you can connect to any LLM API — including free-tier APIs.
Free tier: Unlimited (you provide your own API key)
Free LLM APIs
Google Gemini API (Free Tier)
Gemini 1.5 Flash offers a genuinely useful free tier: 15 requests per minute, 1 million tokens per minute, and 1,500 requests per day.
Free tier: 15 RPM, 1M TPM, 1,500 RPD
Groq (Free Tier)
Fast open-source models (Llama 3, Mixtral, Gemma) with rates of 30 requests per minute. Groq's inference speed (often 400+ tokens/second) makes it ideal for user-facing streaming applications.
Free tier: 30 RPM on Llama 3.1 8B
Together AI (Free Credits)
Offers $25 in free credits on signup, giving you access to 50+ open-source models.
Free tier: $25 signup credits
Cohere (Trial API Key)
Free trial giving you access to Command models and embedding APIs. Particularly strong for RAG applications and semantic search.
Free AI Development Frameworks
LangChain (Open Source)
The most widely used framework for building LLM-powered applications. Provides abstractions for chains, agents, RAG pipelines, and tool use across all major LLM providers.
LlamaIndex (Open Source)
Specializes in data ingestion and retrieval for LLM applications. If your AI app needs to query over documents, databases, or APIs, LlamaIndex is the go-to framework.
Vercel AI SDK (Open Source)
Provides React hooks and server utilities for building streaming AI interfaces in Next.js. Dramatically reduces the boilerplate for AI chat UIs.
Free Vector Databases
Supabase (Free Tier with pgvector)
Free tier includes PostgreSQL with the pgvector extension — giving you a vector database for semantic search and RAG pipelines at zero cost.
Free tier: 500MB database, 2 projects
Chroma (Self-Hosted, Open Source)
An open-source vector database that runs locally or on your own server. Zero cost, full control, and easy setup.
Free No-Code AI Builders
n8n (Open Source)
An open-source workflow automation tool with native AI integrations. Self-host for free and build complex AI automation pipelines with a visual interface.
Flowise (Open Source)
A low-code tool for building LangChain-based AI flows visually. Drag-and-drop interface for RAG pipelines, chatbots, and agents.
A Free AI App Stack
For an early-stage startup with no budget:
| Layer | Tool | Free Tier | |---|---|---| | Coding assistant | Cursor | 50 req/month | | LLM API | Gemini 1.5 Flash | 1,500 req/day | | Backend framework | FastAPI (Python) | Open source | | Frontend | Next.js + Vercel | Free tier | | Vector database | Supabase pgvector | 500MB | | AI SDK | Vercel AI SDK | Open source | | RAG framework | LangChain | Open source |
This stack can power a fully functional AI chatbot, document Q&A app, or AI analytics tool — entirely for free during development and low-traffic production.
Need help building your AI app fast? Book a free strategy call with SpeedMVPs — we can ship your AI MVP in 2–3 weeks.
