Devin vs Jules (2026)

Devin

by Cognition

Jules

by Google

Pros

• ✓Cognition names Citi, Mercedes-Benz, Goldman Sachs, Elevance, Dell, Santander and the U.S. Army and Navy among customers, publishes more than thirty customer stories, and reported crossing $1 billion in annualized revenue run rate in September 2026.
• ✓Devin Desktop, formerly Windsurf, is bundled into every paid plan, so Pro at $20 per month covers both autonomous cloud sessions and agentic coding in a local IDE under one subscription rather than two.
• ✓MCP works in both directions. Cognition publishes an MCP server at mcp.devin.ai that external agents connect into to manage sessions, playbooks and schedules, and Devin consumes external servers through its MCP Marketplace.

Limitations

• –Devin Cloud sessions run asynchronously, so tasks take minutes to hours rather than the near-instant responses developers expect in an editor. Live debugging and pair programming move to Devin Desktop or the CLI, which run against the same usage quota.
• –Cognition publishes no autonomous task-completion rate. Its 89% figure measures share of commits inside Cognition itself rather than the proportion of assigned tasks completed, and its own case-study language describes a human approving changes on large migrations.
• –Usage past the included quota bills at API rates, so monthly spend is hard to predict for teams running several concurrent sessions, and Enterprise moves to Agent Compute Unit billing with no published rate.

Pros

• ✓Runs tasks in the background in a fresh cloud VM and returns a pull request, with a plan to review first and the option to steer while it works.
• ✓Free plan with 15 daily tasks, and paid limits come bundled with Google AI Pro or Ultra subscriptions rather than a separate Jules bill.
• ✓Suggested tasks, scheduled tasks, automatic CI fixes and a Render integration let it keep working on a repository without a new prompt each time.

Limitations

• –Paid plans are limited to personal @gmail.com accounts: Google Workspace and enterprise accounts cannot upgrade yet.
• –MCP connections are limited to a vetted list of servers, so teams cannot plug in their own MCP tools.
• –Setup scripts cannot run long-lived processes such as dev servers, and Google says it works best with JavaScript and TypeScript, Python, Go, Java and Rust.