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Free AI Coding Agent in VS Code: Build Full Apps with DeepSeek V4 (No Subscription)
Want to build full apps with AI — for free — right inside VS Code? In this tutorial, I'll show you how to set up Cline, a powerful open-source AI coding agent extension, and connect it to DeepSeek V4 Flash completely free, with no API key, no billing setup, and no subscription required.

We'll go step by step: installing Cline, signing in with a free account, selecting the DeepSeek V4 Flash model, and then putting it to work on a real project — a fully functional Invoice Generator app that creates invoices, auto-calculates totals, and exports everything as a downloadable PDF.

You'll see the entire build happen live on screen: Cline writing the HTML, CSS, and JavaScript on its own, installing a PDF library through the terminal, and wiring up the download button — all from a single plain-English prompt.

Whether you're a beginner exploring AI coding tools or a developer looking for a free alternative to paid Copilot or ChatGPT subscriptions, this workflow gives you a genuinely capable coding agent without spending a dollar.

💬 If this helped you, drop a comment with what app you'd want to see built next with free AI tools — and subscribe for more free AI coding tutorials every week.

Gemini 3.6 Flash is missing from Cline’s model list? Here’s the complete working method using the OpenAI Compatible provider so you can start using it right now in VS Code.

In this video, I’ll show you step-by-step:
• How to get a free Gemini API key
• How to fix the “Unable to create API key” error
• How to set up OpenAI Compatible provider in Cline
• Exact Base URL and Model name for Gemini 3.6 Flash

Part 7

Gemini 3.6 Flash is missing from Cline’s model list? Here’s the complete working method using the OpenAI Compatible provider so you can start using it right now in VS Code.

In this video, I’ll show you step-by-step:
• How to get a free Gemini API key
• How to fix the “Unable to create API key” error
• How to set up OpenAI Compatible provider in Cline
• Exact Base URL and Model name for Gemini 3.6 Flash

Part 6

Gemini 3.6 Flash is missing from Cline’s model list? Here’s the complete working method using the OpenAI Compatible provider so you can start using it right now in VS Code.

In this video, I’ll show you step-by-step:
• How to get a free Gemini API key
• How to fix the “Unable to create API key” error
• How to set up OpenAI Compatible provider in Cline
• Exact Base URL and Model name for Gemini 3.6 Flash

Part 5

Gemini 3.6 Flash is missing from Cline’s model list? Here’s the complete working method using the OpenAI Compatible provider so you can start using it right now in VS Code.

In this video, I’ll show you step-by-step:
• How to get a free Gemini API key
• How to fix the “Unable to create API key” error
• How to set up OpenAI Compatible provider in Cline
• Exact Base URL and Model name for Gemini 3.6 Flash

Part 4

Gemini 3.6 Flash is missing from Cline’s model list? Here’s the complete working method using the OpenAI Compatible provider so you can start using it right now in VS Code.

In this video, I’ll show you step-by-step:
• How to get a free Gemini API key
• How to fix the “Unable to create API key” error
• How to set up OpenAI Compatible provider in Cline
• Exact Base URL and Model name for Gemini 3.6 Flash

Part 3

Gemini 3.6 Flash is missing from Cline’s model list? Here’s the complete working method using the OpenAI Compatible provider so you can start using it right now in VS Code.

In this video, I’ll show you step-by-step:
• How to get a free Gemini API key
• How to fix the “Unable to create API key” error
• How to set up OpenAI Compatible provider in Cline
• Exact Base URL and Model name for Gemini 3.6 Flash

Part 2

Gemini 3.6 Flash is missing from Cline’s model list? Here’s the complete working method using the OpenAI Compatible provider so you can start using it right now in VS Code.

In this video, I’ll show you step-by-step:
• How to get a free Gemini API key
• How to fix the “Unable to create API key” error
• How to set up OpenAI Compatible provider in Cline
• Exact Base URL and Model name for Gemini 3.6 Flash

Part 1

10 Free AI Coding Tools Every Developer Should Know

Gemini 3.6 Flash is missing from Cline’s model list? Here’s the complete working method using the OpenAI Compatible provider so you can start using it right now in VS Code.

In this video, I’ll show you step-by-step:
• How to get a free Gemini API key
• How to fix the “Unable to create API key” error
• How to set up OpenAI Compatible provider in Cline
• Exact Base URL and Model name for Gemini 3.6 Flash