Replace / SonarCloud
Best free SonarCloud alternatives (open source, self-hosted) 2026
The best open-source alternative to SonarCloud is SonarQube or Semgrep, self-hosted on Railway. Code inspection you host. SonarQube Community is LGPL-3.0; Semgrep OSS is LGPL-2.1 — SonarCloud without the analysis seat.
Estimated save $1,200 a year.
Open the stackStart on Railway
How SonarCloud compares
| SonarCloud | SonarQube / Semgrep | |
|---|---|---|
| Pricing model | Hosted subscription | Open-source or fair-code license; you pay the host |
| Hosting | Vendor cloud | Self-hosted on Railway or any VPS |
| Rough monthly cost | Public list price not verified this run | Hosting only — no SaaS seat meter in this repo |
- SonarQube
LGPL-3.0 continuous inspection (Community Build; skip commercial editions)
- Semgrep
LGPL-2.1 pattern-based static analysis if you want that CLI
FAQ
- What is the best free open-source SonarCloud alternative?
- The best open-source alternative to SonarCloud is SonarQube or Semgrep, self-hosted on Railway. Code inspection you host. SonarQube Community is LGPL-3.0; Semgrep OSS is LGPL-2.1 — SonarCloud without the analysis seat.
- Is it free?
- The SonarQube / Semgrep licenses are open source or fair-code. You still pay hosting (Railway or any VPS) and any APIs the stack calls. There is no SonarCloud seat or task bill on this path.
- Can I migrate from SonarCloud?
- Yes. Start with the workflows or data you actually use, then cut over. The SonarQube / Semgrep stack page has the agent prompt and the cost table; most teams rebuild the slice that matters and leave old SonarCloud links until they expire.
- How do I deploy it?
- Open the SonarQube / Semgrep stack, copy the agent prompt, and deploy on Railway (one service, PORT, and a volume when the app needs disk). Placeholder: SonarQube + a database and a volume. Bind HTTP to 0.0.0.0:$PORT. Semgrep is a CLI you run in CI. No one-click template in this repo yet — Start on Railway. Image CVEs stay on /stacks/trivy-scan.
- What does this replace?
- SonarCloud. The published small-team estimate on this stack is $1,200 a year.
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