Aider vs Windsurf
Auto-updated comparison · last refreshed September 3, 2026
TL;DR
| Aider | Windsurf | |
|---|---|---|
| Type | cli | ide-fork |
| Vendor | open source | Codeium |
| Pricing | Free tier (you pay LLM API costs directly) | Free tier · Pro $15/month · Business $30/user |
| Autocomplete | No | Yes |
| Agent mode | Yes | Yes |
| MCP support | No | Yes |
| Local models | Yes | No |
| Self-hosted | Yes | No |
| Codebase indexing | No | Yes |
| Team features | No | Yes |
Where Aider wins
- open source
- any model via API
- excellent diff format
Where Windsurf wins
- Cascade autonomous mode
- flow credits stretch further
- explains plans before acting
Weaknesses
Aider: no GUI; you pay API costs directly; steeper learning curve
Windsurf: occasional Cascade hangs; slightly slower autocomplete
Best for
Pick Aider if you are OSS purists, or power users, or local LLM enthusiasts.
Pick Windsurf if you are multi-file refactors, or budget-conscious devs, or less experienced users.
FAQ
Is Aider more expensive than Windsurf?
Free tier (you pay LLM API costs directly) vs Free tier · Pro $15/month · Business $30/user. Compare the Pro tiers first if you're a solo dev; Business/Enterprise only matters for teams.
Do Aider and Windsurf use the same AI models?
Aider supports: any via API. Windsurf supports: claude-sonnet-4-6, gpt-4.1, gemini-2.5-pro. Most modern tools default to Claude Sonnet 4.6 in 2026.
Can I use both?
Yes. They don't conflict at the file level. Some devs use one for autocomplete and one for agent work.
Related comparisons
Best Aider and Windsurf pairings by language
- Python: Aider for Python · Windsurf for Python
- TypeScript: Aider for TypeScript · Windsurf for TypeScript
- Rust: Aider for Rust · Windsurf for Rust
- Go: Aider for Go · Windsurf for Go