Aider vs Devin: Side-by-Side Comparison 2026

Aider vs Devin comparison for 2026. Features, pricing, AI capabilities, and editor support analyzed side by side to help you choose the right coding tool for your workflow.

Aider is a CLI-based coding agent from Paul Gauthier (Open Source) — ai pair programming in your terminal. Devin is an AI agent from Cognition — fully autonomous ai software engineer.

Aider

Open-source CLI tool for AI pair programming. Works with OpenAI, Claude, and other models to edit code in your local git repo.

  • ✓ Git-aware editing
  • ✓ Multi-file editing
  • ✓ Model agnostic
  • ✓ Voice coding
  • ✓ Image support

Free · 1 plan

Devin

Autonomous AI coding agent by Cognition. Handles full development tasks end-to-end. Cognition also owns Windsurf, integrating IDE and agent workflows.

  • ✓ AI chat
  • ✓ Agentic mode
  • ✓ Multi-file editing
  • ✓ Terminal commands
  • ✓ Test generation

$20/mo · 3 plans

Feature Aider Devin
Category CLIAgent
Starting Price Free $20/mo
Model Family Multi-model (any)Proprietary
Documentation — ✓
Voice Input ✓ —
Git Integration — ✓
Open Source Yes (Apache 2.0)No

Pricing verified May 4, 2026. Aider pricing | Devin pricing

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Key Differences

  • Category: Aider is a CLI-based coding agent; Devin is an AI agent.
  • Free tier: Aider has a free tier; Devin does not.
  • Starting price: Aider starts at free / BYOK; Devin starts at $20/mo.
  • Model family: Aider uses Multi-model (any); Devin uses Proprietary.
  • Open source: Aider: Yes (Apache 2.0). Devin: No.
  • Bring your own key: Aider supports BYOK; Devin does not.
  • Platforms: Aider runs on Linux, Windows, macOS; Devin runs on Web.
  • Provider: Aider is built by Paul Gauthier (Open Source); Devin is built by Cognition.
  • Capabilities: Aider has voice input.

Which Should You Choose?

Choose Aider if you want a fully open-source tool with transparent development. Choose Devin if you want fully autonomous engineering tasks with minimal supervision. Read our full reviews to see which fits your workflow.

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