Stoneforge vs Devin AI

Devin AI vs Stoneforge: autonomous engineer vs multi-agent orchestration

Devin AI and Stoneforge represent two different philosophies for AI-assisted software development. Devin AI aims to be an autonomous software engineer that works independently in the cloud. Stoneforge is an open-source AI coding agent orchestration layer that keeps you in control while coordinating multiple agents locally.

If you’re evaluating a Devin AI alternative, understanding these architectural differences will help you choose the right tool for your workflow.

What is Devin AI?

Devin AI, built by Cognition, is designed to handle entire engineering tasks end-to-end. You give it a task — a Jira ticket, a Slack message, a bug report — and it plans, writes code, tests, and opens a pull request. It runs in a cloud sandbox with its own terminal, code editor, and browser, so it can read documentation, install dependencies, and debug issues without human intervention.

Under the hood, Devin AI uses a compound AI system with specialized models: a Planner for breaking down tasks, a Coder for implementation, and a Critic for reviewing code quality and security. This architecture lets it handle complex, multi-step tasks autonomously.

Devin AI’s strength is convenience. You describe what you want, and it delivers a PR. The trade-off is that you’re delegating control to a cloud-based system you can’t self-host (outside of Enterprise VPC), and you’re locked into Devin AI’s own models.

Stoneforge: self-hosted AI coding agent orchestration

Stoneforge takes a different approach. Instead of being an AI engineer itself, it orchestrates other AI coding agents — Claude Code, Codex, OpenCode, or any CLI-based agent you prefer. You act as the Director, defining tasks with priorities and dependencies. The Daemon dispatches tasks to available agents, each working in an isolated git worktree. Steward agents handle merge and review automatically.

Everything runs locally on your machine. You choose which agents to use, you see exactly what they’re doing, and your code never leaves your infrastructure. For teams that need a self-hosted AI coding agent, this is a key advantage over Devin AI.

The autonomy trade-off

The core difference is how much control you want:

• Devin AI optimizes for autonomy. It’s best when you want to hand off a task and get a PR back without managing the process. This works well for well-defined tasks where you trust the AI to make good decisions.
• Stoneforge optimizes for structured coordination. It’s best when you have many tasks with dependencies, want to choose your own agents, or need to keep code local. You stay involved as the Director, but agents do the implementation work.

# Stoneforge: structured task orchestration with dependencies
sf plan create --title "Payment System Overhaul"

sf task create --title "Add Stripe webhook handlers" --plan "Payment System Overhaul"
sf task create --title "Implement subscription billing" --plan "Payment System Overhaul"

# This task waits until webhook handlers are merged
sf task create --title "Add payment failure retry logic" --plan "Payment System Overhaul" \
  --depends-on "Add Stripe webhook handlers"

Multi-agent parallelism vs single-agent sessions

Devin AI runs as a single agent per session. You can start multiple sessions on different tasks, but there’s no built-in coordination between them — if two sessions touch overlapping code, you resolve conflicts manually.

Stoneforge is designed for multi-agent development from the ground up. The Daemon manages a task queue, respects dependency ordering, and dispatches work to available agents automatically. Steward agents handle merging, so conflicts are caught and resolved as part of the workflow.

Devin AI pricing vs Stoneforge

Devin AI price starts at $20/month for the Core plan with pay-per-use pricing ($2.25 per Agent Compute Unit). The Devin AI Teams plan costs $500/month. Enterprise pricing is custom.

Stoneforge is free and open-source. Your cost is whatever the underlying AI agents charge for API usage. Since you bring your own agents and API keys, you have full control over spending. See how Stoneforge compares to other AI coding agents for more details.