Windsurf

Windsurf is an AI IDE built by the Codeium team. Its standout feature is the Cascade agent — describe what you need, and Cascade breaks it into steps, modifying code, creating files, and running commands automatically.

The free plan offers unlimited basic completions, which is more generous than Cursor's free tier. Premium features (Cascade with GPT-4o/Claude) have monthly quotas.

Windsurf free plan includes:
- Unlimited basic code completions (Codeium's own model)
- Limited Cascade premium requests
- Codebase indexing
- VS Code extension compatibility

Basic completion quality is solid for daily coding. Premium quota is only consumed when using GPT-4o/Claude level capabilities.

Windsurf doesn't support custom API keys yet (unlike Cursor). But you can:
1. Use unlimited free completions for daily coding
2. Switch to Cursor + API aggregator for complex tasks
3. Combine both editors to maximize free usage

Watch for Windsurf potentially adding custom key support later.

Windsurf downloads and installs normally. AI features connect to Codeium servers, accessible from most regions in China, occasionally may need a proxy.

Basic completion latency is low. Cascade premium features may be slightly slower.

Q: Windsurf or Cursor?
A: Light use → Windsurf (unlimited free completions). Heavy use or custom keys → Cursor.

Q: Is the Cascade agent reliable?
A: Good for simple to medium tasks. Review manually for complex refactoring.

Q: Easy to migrate from VS Code?
A: Very easy, settings and extensions can be imported with one click.

Cascade is Windsurf's killer feature and its biggest differentiator from Cursor.

How it works: Describe a requirement (e.g., "add user authentication to this project"), and Cascade automatically:
1. Analyzes existing code structure
2. Creates an implementation plan
3. Creates/modifies files step by step
4. Runs necessary commands (installing dependencies, etc.)
5. Verifies results

Best for: Adding new feature modules, refactoring code, fixing complex bugs, generating test cases.

Note: Cascade works well for simple to medium complexity tasks. For complex architectural refactoring, review each step manually. Free plan has monthly quota limits for premium Cascade requests.

The most frequently asked question. Quick summary:

Choose Windsurf if you: want unlimited free completions, like AI completing multi-step tasks (Cascade), don't need custom API keys, prefer "AI does it for you" workflow.

Choose Cursor if you: need custom API keys (connect API aggregator to save money), prefer "AI assists you" workflow, need finer AI control, heavily use GPT-4o/Claude.

Best strategy: Install both. Use Windsurf's free completions daily, switch to Cursor + API aggregator for complex tasks.