Aider vs Devin

Aider (Paul Gauthier (open source)) and Devin (Cognition) compared head-to-head: prices from $0 and $20, model-dependent vs. agentic sandbox context, free tiers, models, limits plus strengths and weaknesses. Find out which AI coding agent fits your workflow.

Aider vs Devin — Category side-by-side

Provider	Aider Paul Gauthier (open source)	Devin Cognition
From /month	Free	$20
Billing	BYO-key (usage)	subscription + usage (ACU)
Top models	Claude Sonnet 4, GPT-5, DeepSeek	Devin (Cognition)
Context	model-dependent	agentic sandbox
Limits	whatever your API key allows	ACU-based; ~$9/h of Devin time
Free tier	free software (model usage billed separately)	no — paid only
Best for	Terminal-first devs who want git-native AI edits	Offloading well-scoped engineering tasks to an autonomous agent
Strengths	Git-native workflow Works with any API provider Lightweight CLI	Truly autonomous end-to-end agent Parallel tasks PR-ready output
Weaknesses	CLI only You supply & pay for the model	Expensive at scale Needs well-scoped tasks

Recommendation by priority

💰 On a budget? Aider ($0) is cheaper than Devin ($20).

Aider is especially strong when you care about "Terminal-first devs who want git-native AI edits".

🆫 Start without budget? Aider shines with a free tier (free software (model usage billed separately)).

Aider is especially strong when you care about "Terminal-first devs who want git-native AI edits".

Go to Aider → Go to Devin →

Frequently asked questions: Aider vs Devin

Aider or Devin: which is cheaper?

The entry price depends on each provider and plan tier. This page shows the current indicative values side by side.

Which offers more context — Aider or Devin?

Aider reaches model-dependent, Devin reaches agentic sandbox. More context helps with long files and large repos.

Is there a free tier for Aider or Devin?

Yes — details on free tiers and free quotas are in the side-by-side table above.