Aider vs Devin
A side-by-side comparison of capabilities, autonomy, integrations, and pricing to help you choose.
Short answer: choose Aider if you want open-source ai pair programming in your terminal, backed by git (Supervised agent, free); choose Devin if you want autonomous ai software engineer that takes delegated tickets to a reviewed pr (Supervised agent, usage).
| Aider | Devin | |
|---|---|---|
| What it is | Open-source AI pair programming in your terminal, backed by Git | Autonomous AI software engineer that takes delegated tickets to a reviewed PR |
| Type | agent | agent |
| Autonomy | Supervised agent | Supervised agent |
| Pricing | free · Free (open source; pay your own model costs) | usage · $20/mo + usage (ACU credits) |
| Best for | developers | enterprise, mid-market, developers |
| Deployment | self-hosted | saas, api |
| Modalities | text, code | text, code, browser, api |
| Models | model-agnostic | claude, proprietary |
| Protocols | function-calling, rest-api | mcp, rest-api, function-calling |
| Integrations | Git, GitHub, OpenAI, Anthropic, Google Gemini, DeepSeek | GitHub, GitLab, Bitbucket, Slack, Microsoft Teams, Jira |
| Capabilities | 4 documented | 4 documented |
Aider
- +Fully open source (Apache-2.0) and free; you only pay your chosen model provider
- +Git-native: every AI change is a reviewable, revertible commit
- +Model-agnostic with a repo map that scales to larger codebases
- -Terminal-only with no GUI or IDE-native experience for those who want one
- -Runs locally and edits real files, so a human must review every change
Devin
- +Genuinely async, delegated model: handles whole tickets and large parallel migrations rather than line-by-line autocomplete
- +Deep workflow integration (Slack, Jira, Linear, GitHub) plus DeepWiki codebase indexing and a public API
- +Validated at large, complex enterprises
- -Best on clear, verifiable tasks; Cognition's own framing acknowledges it can make mistakes or get stuck on complex work and needs human review
- -Usage-based ACU billing can get expensive and unpredictable on open-ended work
Which should you choose?
Aider is open-source ai pair programming in your terminal, backed by git, best for developers. Devin is autonomous ai software engineer that takes delegated tickets to a reviewed pr, best for enterprise, mid-market, developers. The right choice depends on the autonomy level you want, your existing integrations, and your budget, all compared above.