KeelenCompare — Keelen vs Lovable
Lovable builds version one. Keelen ships every version after.
Lovable and Keelen solve different halves of the same project. A prompt-to-app builder is the fastest way to get a first working version in front of people: you describe an app and it generates one. Keelen is what happens next. It connects to the GitHub repository your project exports to and keeps developing it: turning written requests into roadmap items and dev-ready tasks, writing the code in isolated single-use VMs on your own Claude, Codex, GLM, or Kimi credentials, and shipping each change as a pull request that has passed test and review gates.
The handover point is the export. Once the code lives in a repository you own, it is ordinary software, and what it needs is ordinary software practice: tests, review, CI, and someone shipping on a rhythm.
✓ / ~ / — describe the designed workflow of each product category, not a version-by-version feature audit — products evolve, so check the vendor's docs for current capabilities. The Keelen column is backed by shipped, tested code.
Different halves, honestly
Generating a working first version from a description is a hard problem, and builders are good at it. Keelen does not do it: it has no visual editor, no preview pane, and no way to produce an app from a single sentence. It starts from a repository.
What builders are not built for is the second year: dependency patches, bugs real users hit, small improvements every week, and a test suite that keeps all of it safe. That work is repetitive, well-specified, and continuous, which is exactly what a standing loop is for.
Why the second change is the hard one
The first version of a generated app is coherent because one pass wrote all of it. The second change has to fit code nobody has read, usually with no tests to say whether it still works. That is not a defect in the builder; it is the normal cost of software that has started to have a past.
Keelen's answer is the gates rather than better prompting. Five gates stand between the AI and your main branch. New tests are applied without the implementation first and must fail — tests born green are rejected. An independent adversarial reviewer that shares no context with the dev run reviews the diff. Your real test suite runs on a clean checkout. Nothing merges over a red required CI check. And gated auto-merge waits out a review window — or you can replace it entirely with plan-review sign-off, manual merge, or branch-only mode.
Use both
The sensible pattern is a builder for the first version and a loop for everything after it. Export to GitHub, connect the repository, and ask for a smoke test and a CI workflow as your first requests. From there the app is maintainable by anyone, including you later.
Keelen runs on credentials you connect: Anthropic Claude (subscription login or API key, via Claude Code), OpenAI Codex, Zhipu GLM, or Moonshot Kimi. Token usage bills to your own provider account at cost — Keelen charges a flat monthly tier ($29 / $79 / $299) and never marks up tokens.
FAQ
Can Keelen work inside Lovable?
No. Keelen works on a GitHub repository. Export your project first, connect that repository, and the loop takes it from there. You can keep using the builder alongside it if you want.
My generated app has no tests. Can Keelen still work on it?
Yes, and building that floor is usually the first work. Ask for a smoke test and a CI workflow as your opening requests. Until a suite exists, keep the project on manual merge so you review each pull request yourself.
Will it regenerate or rewrite my app?
No. Work arrives as one task per pull request, scoped to the request you wrote. Anything too large or cross-cutting is refused at planning time and sent back for splitting rather than attempted as one sweeping change.
What does it cost compared with a builder subscription?
Keelen runs on credentials you connect: Anthropic Claude (subscription login or API key, via Claude Code), OpenAI Codex, Zhipu GLM, or Moonshot Kimi. Token usage bills to your own provider account at cost — Keelen charges a flat monthly tier ($29 / $79 / $299) and never marks up tokens.