Side-by-Side Comparison · 2026

Aider vs Windsurf (formerly Codeium): Full Comparison (2026)

Aider is ai pair programming in your terminal with git integration. Windsurf (formerly Codeium) is ai-first ide, now devin desktop (renamed from windsurf on 2 june 2026). Use the breakdown below to find the right fit for your needs.

Aider

Aider AI

Free
vs

Windsurf (formerly Codeium)

Windsurf (Cognition AI)

Freemium
This page presents factual information sourced from publicly available vendor documentation and product pages. AIHub does not endorse either product. The right tool depends on your specific use case, team, and requirements — we recommend evaluating both tools directly before making a decision.

Side-by-Side Overview

Pricing Model
Aider: FreeWindsurf (formerly Codeium): Freemium
API Access
Aider: Not availableWindsurf (formerly Codeium): Not available
Platforms
Aider: WebWindsurf (formerly Codeium): Web
Integrations
Aider: —Windsurf (formerly Codeium): —
Vendor
Aider: Aider AIWindsurf (formerly Codeium): Windsurf (Cognition AI)
Category
Aider: Code AssistanceWindsurf (formerly Codeium): Code Assistance
Launch
Aider: —Windsurf (formerly Codeium): —

About Aider

Aider is an open-source AI coding tool that runs in your terminal and integrates directly with git. It can edit multiple files, understand your full codebase, and automatically commit changes, making it ideal for test-driven development.

Designed For

  • Test-driven development
  • Multi-file refactoring
  • Bug fixing
  • Feature addition
Full Aider details

About Windsurf (formerly Codeium)

Codeium rebranded to Windsurf in late 2024, launching an AI-first IDE (fork of VS Code) with Cascade - an agentic engine that can autonomously plan and execute multi-step coding tasks. Cognition AI (makers of Devin) acquired Windsurf in July 2025, after OpenAI's reported $3B bid lapsed and Google licensed the technology and hired its leadership; Cognition's terms were not publicly disclosed. On 2 June 2026 Cognition renamed Windsurf to Devin Desktop, keeping pricing and the editor the same.

Designed For

  • Code completion
  • Agentic coding
  • Refactoring
  • Multi-file edits
Full Windsurf (formerly Codeium) details

Strengths & Limitations

Aider

Strengths

  • Open source
  • Git-integrated
  • Works with any LLM API
  • Terminal-based

Limitations

  • Terminal interface (no GUI)
  • Requires API keys

Windsurf (formerly Codeium)

Strengths

  • Cascade agentic engine
  • Free tier available
  • 70+ languages
  • VS Code compatible

Limitations

  • New product, less mature than Cursor
  • Cognition acquisition uncertainty

Frequently Asked Questions

What is the difference between Aider and Windsurf (formerly Codeium)?

Aider is ai pair programming in your terminal with git integration, while Windsurf (formerly Codeium) is ai-first ide, now devin desktop (renamed from windsurf on 2 june 2026). Aider is designed for Code Assistance; Windsurf (formerly Codeium) is designed for Code Assistance. The right fit depends on your specific requirements.

How do the pricing models compare?

Aider is available under a Free model. Windsurf (formerly Codeium) is available under a Freemium model. Always verify pricing on each vendor's official website as it may change.

How do I choose between Aider and Windsurf (formerly Codeium)?

Consider your team's technical requirements, budget, existing tooling, and use case before deciding. We recommend signing up for free trials or demos of both tools where available, and consulting each vendor's documentation. AIHub provides this comparison for informational purposes only.