Which AI IDE Is Best? A 2025 Comparison of Cursor, Windsurf, Kiro & Copilot

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Elia Corkery Marketing Executive
3 min read in AI
(672 words)
published

Why the future of software development may be built on forks of VS Code, and what we discovered building our own AI coding assistant.

AI is rapidly transforming the developer experience. Over the past year, we've seen a surge in AI-powered IDEs (Integrated Development Environments) - intelligent coding tools designed to boost developer productivity, reduce bugs, and accelerate software delivery.

In this piece, we compare some of the top players at the moment:

And we share insights from our own experiment: building a custom AI plugin inside VS Code to support developers during a recent New Icon hackathon.

Why AI IDEs Matter for Software Development

Traditional IDEs are now being supercharged with AI developer tools. Think code completion, multi-file refactoring, natural language queries, automated documentation, and context-aware debugging.

For software teams building with modern stacks (React, Python, Node.js, etc.), these tools are reshaping workflows, moving from "autocomplete" to true AI-powered coding assistants that help engineers think, build, and ship faster.

AI IDE Comparison: Cursor vs Windsurf vs Kiro vs Copilot

Cursor - AI-First IDE for Pair Programming

Cursor is one of the most advanced AI code editors on the market. Built as a fork of VS Code, it integrates GPT-4 and Claude to offer:

  • In-editor chat for real-time code queries
  • Multi-file refactoring and context understanding
  • Embedded documentation lookup and explanation
  • Full-stack awareness of your codebase

Windsurf – Context-Aware AI Agent for Developers

Windsurf focuses on becoming an AI teammate that “learns” your entire codebase. It offers:

  • A persistent AI agent trained on your repo
  • Natural language search across code and docs
  • More ambitious contextual capabilities than Copilot

It’s early days, but for large monorepos and complex apps, Windsurf’s potential is huge.

Kiro – Amazon’s Secure AI IDE for Enterprises

Kiro is Amazon’s recent entry into the AI IDE market. Also based on a VS Code fork, it’s built for:

  • Enterprise-grade security
  • AWS-native workflows
  • Deep integrations with Amazon Q, Bedrock, and cloud dev tools

The UI feels less flashy than Cursor, but this one is clearly built for large teams and scalable infrastructure.

GitHub Copilot + VS Code - The AI OG

Still the default setup for many, GitHub Copilot remains a strong choice for autocomplete, suggestions, and boilerplate generation. It now integrates with Copilot Chat and is pushing toward more agent-like functionality. However, newer tools are beginning to surpass it in UX, repo comprehension, and customisation.

What They All Have in Common: Forks of VS Code

Every single one of these AI IDEs is built on a fork of Microsoft’s open-source VS Code editor. This has created a fascinating dynamic:

  • The battle isn’t about the editor, it’s about the AI agent layer
  • The winner will be the tool that best understands context, not just syntax
  • AI developer tools are evolving from “helpers” to collaborators

Our Experiment: We Built Our Own AI Layer, Too

At New Icon, we’ve been exploring these same possibilities hands-on.

In a recent internal hackathon, our team built an AI-powered file search tool - fAIo - designed to solve the all-too-familiar pain of chaotic file systems. What’s notable? We built it as a lightweight, AI-enhanced layer on top of our dev tools, using OpenAI and Node.js, without needing a full IDE fork.

It was a rapid prototype, but it proved something powerful… you don’t need to fork VS Code to get real value from AI in developer workflows, you just need to target the right problem.

While the major players are racing to own the AI coding experience from the top down, fAIo showed what’s possible from the bottom up: focused, intelligent tooling that plugs into your stack and solves real-world issues fast.

What’s Next for AI Developer Tools?

We’re entering a new phase of software engineering where AI agents embedded in developer workflows will become as common as linters or CI/CD pipelines.

The real question isn’t “Which tool autocompletes fastest?”
It’s “Which one truly understands what I’m trying to build?”

Don’t fork it… fix it

Instead of wrestling with generic IDEs or one-size-fits-all platforms, we help teams prototype smartly with purpose-built AI tools that deliver ROI fast. Book a discovery session with our team.


Elia Corkery Marketing Executive at New Icon

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