Devin (Cognition AI)
An autonomous AI software engineer that plans, writes, and ships code
Overview
Devin was one of the first AI tools marketed explicitly as an "AI software engineer" rather than an autocomplete or chat assistant, and it went viral for that framing back when it launched. It plans out a coding task, writes the implementation, tests it, and can open a pull request, working more independently than most coding copilots which wait for you to accept or reject each suggestion. It's designed to work inside a real codebase, not a toy sandbox, which is the whole point: hand it a ticket and get back something closer to a finished PR.
Pricing is built around Agent Compute Units, a normalized measure of the VM time, model inference, and bandwidth Devin uses while actively working, with one ACU representing roughly 15 minutes of autonomous work. The Core plan starts at $20 with pay-as-you-go billing at $2.25 per ACU, while Team runs $500/month with a bundled 250 ACUs at a slightly discounted rate. It's a genuinely capable tool, but it's built for teams that already understand agentic coding workflows and are comfortable reviewing AI-generated pull requests, not a beginner-friendly on-ramp to coding.
Key Features
Autonomous Task Execution: Plans, writes, tests, and ships code with minimal human intervention.
Existing Codebase Integration: Works inside your current repositories and toolchain rather than a sandboxed demo environment.
Concurrent Sessions: Run multiple Devin sessions on different tasks at once, with higher caps on paid plans.
ACU-Based Billing: Pay for actual compute used rather than a flat seat license.
Enterprise Deployment: VPC deployment, SSO, and admin controls for large organizations.
Team Onboarding: Optional onboarding calls and early access to research previews on the Team plan.
Pricing
Starting price
$20/mo (Core plan, pay-as-you-go at $2.25 per ACU)
Core: Starts at $20, pay-as-you-go at $2.25 per ACU, up to 10 concurrent sessions.
Team: $500/month. 250 ACUs included at $2.00 per ACU, unlimited concurrent sessions, early feature access.
Enterprise: Custom pricing. VPC deployment, SSO, dedicated account team, custom terms.
Disclaimer: ACU-based pricing changes with usage and updates, confirm exact rates on Devin's own pricing page before buying.
Pros
Genuinely Autonomous: Handles multi-step coding tasks with less hand-holding than most AI coding assistants.
Works In Real Codebases: Integrates with your existing repos and tools rather than a limited demo environment.
Pay For What You Use: ACU-based pricing means light users aren't stuck with an unused flat subscription.
Enterprise-Ready: VPC deployment, SSO, and admin controls for organizations with real security requirements.
Cons
Costs Add Up Fast: ACU billing at $2.25 each can get expensive quickly on complex, long-running tasks.
Needs Careful Review: Autonomous output still requires a human to review pull requests before merging, especially on unfamiliar code.
Steep Learning Curve: Not a beginner tool, best suited to teams already comfortable with agentic coding workflows.
Team Plan Is A Big Jump: $500/month for Team is a significant leap from the pay-as-you-go Core plan.
What Makes It Unique
Full Task Autonomy: Plans, writes, tests, and ships code end-to-end on a task, rather than only suggesting code for a human to accept.
Kay Score
7.6
/ 10
Tool Information
Pricing
$20/mo (Core plan, pay-as-you-go at $2.25 per ACU)
Category
Coding & Development
Platform
Web / iOS / Android
Last Updated
