Skip to main content
🛠️

Free AI with Function Calling

We've analyzed all major AI tools to find which ones offer function calling for free. Here are 37 top options you can start using right now without a credit card.

ChatGPT

OpenAI

Versatile conversational AI for everyday work

1.8B / mo estimated traffic
Free / $20/mo
View Details

Claude

Anthropic

Advanced reasoning and nuanced long form analysis

140M / mo estimated traffic
Free / $20/mo
View Details

Google Gemini

Google

Multimodal AI integrated into Google Workspace

420M / mo estimated traffic
Free / $19.99/mo
View Details

DeepSeek

DeepSeek AI

Open weights reasoning model for complex computation

310M / mo estimated traffic
100% Free
View Details

Cursor

Anysphere

AI first code editor for rapid engineering

42M / mo estimated traffic
Free / $20/mo
View Details

GitHub Copilot

GitHub

AI pair programmer integrated into popular IDEs

82M / mo estimated traffic
Free / $10/mo
View Details

Windsurf

Codeium

Agentic IDE designed for deep codebase collaboration

12.4M / mo estimated traffic
Free / $20/mo
View Details

Llama

Meta

Open-source large language model family

5M / mo estimated traffic
100% Free
View Details

Comet

Perplexity AI

AI-native browser with a sidecar assistant

8M / mo estimated traffic
Free / $20/mo
View Details

NotebookLM

Google

Gemini Notebook — research grounded in your sources

12M / mo estimated traffic
Free / $19.99/mo
View Details

Google Antigravity

Google

Agentic IDE, CLI, SDK, and desktop command center

4.5M / mo estimated traffic
Free / $19.99/mo
View Details

Kiro

Amazon

Spec-driven agentic IDE, CLI, web, and mobile

3.2M / mo estimated traffic
Free / $20/mo
View Details

CodeRabbit

CodeRabbit

Agentic AI code review for pull requests, IDE, and CLI

2.8M / mo estimated traffic
Free / $24/mo
View Details

Replit

Replit

Browser IDE and Agent that publishes full-stack apps

11M / mo estimated traffic
Free / $20/mo
View Details

Aider

Aider

Open-source AI pair programming in the terminal

1.5M / mo estimated traffic
100% Free
View Details

Warp

Warp

AI terminal, agent CLI, and cloud software factories

4.2M / mo estimated traffic
Free / $20/mo
View Details

Tabnine

Tabnine

Private, air-gappable AI coding assistant and agents

2.1M / mo estimated traffic
Free / $39/mo
View Details

n8n

n8n

Source-available workflow automation with AI agents

5M / mo estimated traffic
Free / $22/mo
View Details

Groq

Groq

Fast LPU inference API, playground, and Whisper STT

3.5M / mo estimated traffic
100% Free
View Details

OpenRouter

OpenRouter

One OpenAI-compatible API for 500+ models

4.5M / mo estimated traffic
100% Free
View Details

Hugging Face

Hugging Face

Model hub, datasets, Spaces, and inference

25M / mo estimated traffic
Free / $9/mo
View Details

OpenClaw

OpenClaw

Open-source personal agent on your machine and chat apps

2.2M / mo estimated traffic
100% Free
View Details

Otter.ai

Otter.ai

AI meeting notes, live transcription, and Otter Chat

8M / mo estimated traffic
Free / $16.99/mo
View Details

Zapier

Zapier

No-code automation, agents, and 9,000+ app connections

18M / mo estimated traffic
Free / $19.99/mo
View Details

Photoroom

Photoroom

Product photo editor, background removal, and listing API

12M / mo estimated traffic
100% Free
View Details

LangChain

LangChain

Open agent framework plus LangSmith for test, deploy, and govern

6M / mo estimated traffic
100% Free
View Details

Linear

Linear

Issue tracker with agents, MCP, and Linear Agent

4.5M / mo estimated traffic
Free / $10/mo
View Details

ClickUp

ClickUp

Projects, docs, chat, and Brain agents in one workspace

20M / mo estimated traffic
100% Free
View Details

Asana

Asana

Work graph, AI Teammates, and MCP for human-agent teams

25M / mo estimated traffic
100% Free
View Details

Make

Make

Visual automation scenarios across thousands of apps

8M / mo estimated traffic
100% Free
View Details

Figma

Figma

Collaborative design canvas with Figma AI, Make, and MCP

80M / mo estimated traffic
Free / $16/mo
View Details

Amazon Bedrock

Amazon

AWS platform for foundation models, agents, and Guardrails

6M / mo estimated traffic
100% Free
View Details

Azure OpenAI Service

Microsoft

OpenAI models on Azure with enterprise identity and networking

5M / mo estimated traffic
100% Free
View Details

Vertex AI

Google

Google Cloud agent platform, Model Garden, and Gemini API

4M / mo estimated traffic
100% Free
View Details

Deepgram

Deepgram

Speech-to-text, Flux TTS, and a Voice Agent API

1.5M / mo estimated traffic
100% Free
View Details

AssemblyAI

AssemblyAI

Speech-to-text, Voice Agent API, and speech understanding

1.8M / mo estimated traffic
100% Free
View Details

Raycast AI

Raycast

OS launcher chat with 32+ models, extensions, and Ollama

3M / mo estimated traffic
100% Free
View Details