A agentindex
Comparison

Aider vs Windsurf

A like-for-like, spec-level comparison. Both entries are verified against their docs and repo.

Aider

AI pair programming in your terminal, git-native.

  • + Every change is a git commit for trivial rollback
  • + BYOK with any model, including local
  • − Terminal-only, no IDE UI
  • − Steep for non-CLI users

Windsurf

Codeium's AI-native IDE (Cascade agent).

  • + Strong agentic flow in-editor
  • + Generous free tier from Codeium
  • − Closed source
  • − Competes directly with Cursor on a narrow wedge
Spec Aider Windsurf
Category coding-agent coding-agent
License Apache-2.0 Proprietary
Open source Yes No
Self-hostable Yes No
MCP support Yes Yes
Pricing free freemium
Starting price BYOK usage cost $15/mo
Models claude, gpt, gemini, local, byok claude, gpt, gemini, custom
Languages python multi
GitHub stars 46.7k —
Last activity 2026-05-22 —