Developer tools decision
Windsurf
A capable engineer can build a narrow local agent+IDE replacement (editor, terminal, agent runner, Git integration) but cannot cheaply reproduce the vendor’s bundled high-performance models, cloud agents, and enterprise polish—so building is viable for limited workflows but not a full replacement.
Visit website↗Open-source builds that already do this
Every project below is open source and already does this job today. Fork one, self-host it, or take the parts you need — the build prompt further down assumes an empty file, and this is the shortcut past that. Licences differ; check the one on each card before you ship.
What a replacement has to do
- Accept a developer task, run an agent that edits code and runs tests, present changes in an embedded editor/terminal, and commit or hand off the result.
What it still won’t have
- Proprietary high-performance models (SWE-1.6 / SWE-1.7) bundled by the vendor
- Integrated cloud agents and hosted Devin Cloud
- Built-in enterprise admin features (SSO, VPC deploys, centralized billing)
- Vendor integrations marketplace and polished IDE experience
What remains hard
- Proprietary models
Free world-class models Unlimited access to SWE-1.6, the fastest coding model in the world.
- Brand trust
1M+ Users Trusted by over a million developers worldwide
First-year cost
Keep paying
Paying is—cheaper in year one.
On cash alone, building overtakes the subscription at 3 seats.
Money you would actually spend
Time you would spend
—
What you would spend
What we assumed
The verdict above measures whether you could build it. This one is only about money.
Runnable build prompt
Build a minimal self-hosted 'agent IDE' using Electron + Node.js backend and Monaco editor. Scope: (1) a local agent runner process that accepts a task, runs shell/git commands, captures stdout/stderr, and returns structured step logs; (2) embedded editor (Monaco) showing repo files and a patch/apply flow; (3) terminal pane streaming agent command output and allowing manual input; (4) Git integration to create branches and commits; (5) a lightweight orchestration UI to start/stop sessions and view logs. Out of scope: training or hosting large proprietary models, multi-tenant enterprise admin, cloud agent fleet. Include error handling for crashed agents, file IO conflicts, and Git failures; add unit tests for agent runner, Git integration, and editor patch apply logic; provide a docker-compose for local dev and a README with startup steps.
How we checked
How the score was reached
- Pay verdict base20
- An open-source build was found+5
- 5 cited sources+3
- Price verified on pricing page+3
- 3/3 assessment runs agreed+4
- Hard moats found in the evidence-3
- Evidence score32
The base comes from the verdict. Everything under it is a check that either happened or did not, and each one is a fact frozen in this record rather than a judgement made at render time — so the same evidence always produces the same number.
How scoring works →Cited sources · 5
Every page the run actually retrieved.
- official productDevin Desktop | Devin Product
- official pricingPlans and Pricing | Devin Product
- official docsIntroducing Devin - Devin Docs
- open sourcelib4u/rufler
- open sourcedsj1984/mandrel
Integrity checks
What held up, and what did not.
