What is Devin?
Devin, from Cognition, was presented as the first AI software engineer: it works inside a virtual machine with its own browser and terminal, and you assign it tasks like a teammate rather than an autocomplete. It plans, writes, tests and opens the pull request. After launching at a prohibitive $500/month, in 2026 it dropped to a $20 individual plan.
Pros
- Works complete tasks without constant supervision
- Its own environment with browser and terminal: it never touches your machine
- Dropped 96% in price: entry at $20/month
- Fits into the team workflow by opening pull requests
Cons
- ACU usage escalates quickly on long tasks
- It fails on ambiguous or poorly specified problems
- English-only interface and a focus on technical teams
Frequently asked questions
How much does Devin cost?
The Core plan starts at $20/month with ACU-based usage (compute units, around $2.25 each). The Team plan costs $500/month and includes 250 ACUs.
What is an ACU?
Devin's usage unit: it measures the compute work it puts into a task. Long or complex tasks consume far more.
Does it replace a developer?
No. It performs well on well-scoped, clearly described tasks, but gets lost on ambiguous problems. It works better as a boost to the team than as a replacement.