Aider vs Devin: Side-by-Side Comparison 2026

Aider vs Devin comparison 2026. Side-by-side features, pricing & capabilities.

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 Mar 20, 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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