DevinvsJules
Generated from the two spec rows. Green marks the better value where a spec has a clear direction. Everything else is just different.
Devin
Cognition · Autonomous SWE
#139MCP
Panel
5.32 spec wins
- Reliability
- 5.3
- Usefulness
- 5.8
- Cost
- 4.3
- Longevity
- 5.5
“Replaced ACUs with credits in April 2026, so now the meter runs in a unit you already understand.”
Jules
Google · Autonomous SWE
#141MCP
Panel
5.71 spec wins
- Reliability
- 5.3
- Usefulness
- 5.8
- Cost
- 6.3
- Longevity
- 5.3
“Fifteen free tasks a day, as long as you are over 18 and using a personal Gmail rather than the company account.”
Spec by spec
| Spec | Devin | Jules |
|---|---|---|
| Architecture | ||
| Category | Autonomous SWE | Autonomous SWE |
| Runs | cloud, sandbox, local | cloud, sandbox |
| Platforms | web, macos, linux, windows | web, macos, linux, windows |
| Context window | not documented | not documented |
| Protocols | ||
| MCP client | Yes | Yes |
| MCP server | Yes | No |
| Capabilities | ||
| Runs terminal commands | Yes | Yes |
| Multi-file edits | Yes | Yes |
| Git operations | Yes | Yes |
| Browser control | YesCloud sessions ship a first-party interactive Browser tool alongside the shell and IDE, with saved browser profiles for authenticated sites (https://docs.devin.ai/work-with-devin/browser-auth). | YesThe default VM image includes Playwright and chromedriver, and Jules renders a front end and returns screenshots to verify its work (https://jules.google/docs/environment). |
| Sandboxed execution | YesCloud sessions run on a dedicated Devin machine built from environment blueprints and snapshots, and the Devin CLI adds OS-level isolation locally (https://docs.devin.ai/cli/sandbox). | YesEach task gets a secure, short-lived Ubuntu VM with internet access (https://jules.google/docs/environment). |
| Multi-agent orchestration | Yes | No |
| Headless / CI mode | Yes | YesScriptable through `jules remote new --repo ... --session "..."` and the REST API (https://jules.google/docs/cli/reference). |
| Models | ||
| Backbone | Undisclosed (Cognition-managed models) | Gemini 3 Flash, Gemini 3.1 Pro |
| Bring your own model | NoA cross-provider model picker (`--model` / `/model` / config `agent.model`) selects between Anthropic, OpenAI, Google, Cognition and open-source models, but every one of them is served by Cognition: the CLI model reference documents no API key, base URL, gateway, Bedrock, Vertex or Azure deployment of your own, matching pricing.byok = false. | NoJules runs only on Google-hosted Gemini models; there is no provider picker, custom base URL, gateway or cloud deployment of your own. |
| Local models | NoNo base URL, gateway or local endpoint setting exists in the Devin CLI config reference (https://docs.devin.ai/cli/reference/configuration/config-file). | NoTasks run in a Google-hosted VM with no configurable model endpoint, so no local LLM can be used. |
| Cost | ||
| Pricing model | mixed | subscription |
| Starts at | $20/mo | $19.99/mo |
| Free tier | Yes | Yes |
| Bring your own key | NoUsage is billed in Cognition ACUs and no LLM provider key can be supplied; Devin Outposts (https://docs.devin.ai/cloud/outposts/overview) only moves session compute onto your own machines. | NoAccess comes from a Google AI plan; no Gemini API key or Google Cloud project of your own can be attached. |
| Openness | ||
| Open source | No | No |
| License | proprietary | proprietary |
| GitHub stars | n/a | n/a |
Which one would each critic pick
| Critic | Devin | Jules | Pick |
|---|---|---|---|
| El Juez | — | — | not enough reviews |
| El Amigo | 6.3 | 6.8 | Jules — Use Jules for the backlog you never get to, fifteen free tasks a day on a personal Google account, and do not adopt it as a team tool because the paid plans do not accept business accounts yet. |
| El Crítico | 5.3 | 6.3 | Jules — Jules runs your repo in a VM you cannot inspect on a model you cannot choose, and the failure mode is a pull request built on an environment that never installed correctly. |
| El Profesor | 5.0 | 6.3 | Jules — Jules has the correct autonomous architecture, an isolated VM, a plan reviewed before edits, tests run in place, and publishes no benchmark by which to judge what it does with it. |
| La Inversora | 6.8 | 6.0 | Devin — Well funded, acquisitive, and repricing in public; the Windsurf purchase bought distribution, and the April 2026 plan change says the ACU math was not working. |
| La Jefa | 5.8 | 4.8 | Devin — Teams at $80 plus $40 per full seat with shared credits, and Enterprise by quote; the free flex seats are the part finance will like. |
| El Hacker | 2.5 | 4.3 | Jules — A closed VM, Gemini only, a curated MCP list and no key of my own; the CLI and REST API are the only handles, and they are decent handles. |
Picks are derived from each critic's own scores. Humans vote on matchups on the duels page.