Developer tools decision
Devin
A capable engineer can reproduce a useful single-repo agent (PR generation, test run, CLI/mini UI) in ~30 hours using open models and tooling, but Devin's proprietary model (SWE 1.7) and enterprise features (VPC/SSO/scale orchestration) are material differentiators that are costly or impractical to replicate fully.
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
- Index a git repo, generate code changes with an LLM given ticket instructions, create a PR via Git provider API, run tests/CI and report results, accept human review/merge.
What it still won’t have
- Access to Devin's proprietary model SWE 1.7 and any fine-tuned models
- Enterprise features: VPC deployment, SAML/OIDC SSO, centralized admin controls
- Built-in integrations and multi-repo orchestration at scale
- Vendor support, onboarding, and product-level analytics
What remains hard
- Proprietary models
SWE 1.7, our latest model, is now available →
- Proprietary models
Free use of SWE 1.7 and leading open source models
First-year cost
Keep paying
Paying is—cheaper in year one.
On cash alone, building overtakes the subscription at 6 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 an autonomous repo-to-PR agent (stack: Node.js or Python backend, Postgres, Redis, Next.js or minimal React UI) that: 1) clones and indexes a single git repo into embeddings (use OpenAI or an open LLM + local vector DB like Milvus/FAISS), 2) accepts a ticket/prompt and calls an LLM to produce a patch/diff, 3) applies the patch in a feature branch and opens a PR via GitHub API, 4) runs tests in a container (Docker) and reports pass/fail, 5) exposes a CLI and a minimal web UI to review session logs and approve/merge. Out of scope: multi-repo fleet orchestration, proprietary model training, enterprise SSO/VPC. Include error handling for failed merges, CI failures, LLM timeouts, and unit tests for core flows.
How we checked
How the score was reached
- Partly verdict base52
- An open-source build was found+5
- 5 cited sources+3
- Price verified on pricing page+3
- Hard moats found in the evidence-3
- Evidence score60
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 | The AI Software Engineer
- official pricingPlans and Pricing | Devin Product
- official docsIntroducing Devin - Devin Docs
- open sourceTabbyML/tabby
- open sourceOpenHands/OpenHands
Integrity checks
What held up, and what did not.
