41 Free AI Tools to Use LLM & AI Model APIS

Open-source LLM observability and gateway.

Free forever · , Monthly requests

Dev Infrastructure & AI APIs

Accurate speech-to-text API in 50+ languages.

Free forever · , Monthly hours of transcription

Dev Infrastructure & AI APIs

Search API built for AI agents.

Free forever · , 1,000 API credits per month

Dev Infrastructure & AI APIs

LLM router and gateway with cost tracking.

Free forever · , Free $0 plan: full platform on free models

Dev Infrastructure & AI APIs

Open-source LLMOps platform for prompts and evals.

Free forever

Dev Infrastructure & AI APIs

LLM evaluation platform built on DeepEval.

Free forever

Dev Infrastructure & AI APIs

Open LLM app platform for agents, RAG workflows, and observability.

Free forever · , Sandbox (free): 200 message credits, 5 apps, 1 member

AI Agents & Automation

Model hub, Inference API free credits, and Spaces hosting.

Free forever · , Free CPU Basic Spaces and ZeroGPU access; PRO adds $2/month inference credits

Dev Infrastructure & AI APIs

Ultra-fast inference API for open models like Llama and Mixtral.

Free forever · , Free Plan with per-model rate limits

Dev Infrastructure & AI APIs

Build internal tools and AI apps on any database or API.

Free forever · , Up to 5 users with AI app generation

Vibe Coding

Observability, evals and deployment for LLM agents.

Free forever · , Free Developer plan: 5k traces per month

AI Agents & Automation

Serverless platform for apps and GPU inference.

Free forever · , Free instance for one web service

Dev Infrastructure & AI APIs

Email API for developers.

Free forever · , 3,000 emails per month

Dev Infrastructure & AI APIs

Memory API for AI apps.

Free forever

Dev Infrastructure & AI APIs

Search engine results API.

Free forever · , Searches per month

Dev Infrastructure & AI APIs

Prompt management and LLM observability.

Free forever

Dev Infrastructure & AI APIs

Low-cost text-to-speech API.

Free forever

AI Audio & Voice

Open-source version of Bolt that works with any LLM.

Free forever · , Open-source, self-hosted, bring your own model keys

Vibe Coding

Google's Gemini API with a free tier for prototyping.

Free forever · , Rate-limited Gemini API access via Google AI Studio

Dev Infrastructure & AI APIs

Unified API for hundreds of LLMs including free model variants.

Free forever · , Free models with daily request limits

Dev Infrastructure & AI APIs

Try and prototype with NVIDIA-hosted open models via API.

Free forever · , Hosted inference endpoints for leading open models (rate-limited)

Dev Infrastructure & AI APIs

Model APIs and GPU cloud for AI developers.

Free forever · , Some models free to use (e.g. Apodex 1.1 Mini at $0 input/output)

Dev Infrastructure & AI APIs

ML experiment tracking and LLM evaluation, now part of CoreWeave Forge (wandb.ai redirects there).

Free forever · , Free $0/mo plan for personal development: evaluations, tracing, experiment tracking, registry

Dev Infrastructure & AI APIs

API platform with AI agent builder and Postbot.

Free forever · , Free plan for individuals and small teams

Dev Infrastructure & AI APIs

Better chat UI for AI models with your own API keys.

Free forever · , Free web version with your own API key

Chatbots & LLMs

Open-source LLM gateway to call 100+ models with one OpenAI-compatible API.

Free forever · , Open-source proxy

Dev Infrastructure & AI APIs

Low-cost LLM inference API for open models.

Free forever · , Free plan with monthly credits

Dev Infrastructure & AI APIs

Open-source LLM-friendly web crawler.

Free forever · , Open source

Dev Infrastructure & AI APIs

Open-source LLM evaluation and tracing.

Free forever

Dev Infrastructure & AI APIs

Open-source OpenAI-compatible local inference server.

Free forever · , Open source

Dev Infrastructure & AI APIs

Open-source high-throughput LLM serving engine.

Free forever · , Open source

Dev Infrastructure & AI APIs

Command-line productivity tool powered by LLMs.

Free forever · , Open source

AI Coding Assistants

Open-source desktop AI client for multiple LLM providers.

Free forever · , Open source

Chatbots & LLMs

Free open-source app to run small LLMs on your phone.

Free forever · , Open source

Chatbots & LLMs

Open-source front end for chatting with LLMs and characters.

Free forever · , Open source

Chatbots & LLMs

Free open catalog of scholarly works with API.

Free forever

AI Research

Realistic TTS, voice clone, dubbing, and sound effects API.

Free forever · , 10k credits/month

AI Audio & Voice

Enterprise LLMs, embeddings and rerank with a free trial key.

Free forever · , Free rate-limited API key (Cohere calls it a trial key); not for production or commercial use

Dev Infrastructure & AI APIs

Low-latency realistic voice API.

Free forever · , Monthly credits

AI Audio & Voice

Ultra-fast LLM inference API on Cerebras hardware.

Free credits · , One-time $5 promotional credit, expires 30 days after activation; free tier is for development/evaluation, not production

Dev Infrastructure & AI APIs

Embedding and reranking models for retrieval.

Free plan · , Free tokens per account for embeddings and rerankers

Dev Infrastructure & AI APIs