SonarQube Alternatives 2026: 5 Free Options
SonarQube alternatives: Semgrep, Codacy, DeepSource, Snyk and 1 more. Prices and licenses checked October 22, 2026.
•3 min read•Security Software & Testing
Verdict:Few teams need to leave SonarQube for cost reasons alone, because the Community Build is free under LGPL-3.0 and SonarQube Cloud is free up to 50k lines of code for private projects. The usual reasons are different: a Community Build that is missing features reserved for paid editions, a server you would rather not maintain, or a need for stronger security scanning than code-smell rules provide. If security is the goal, Semgrep is the best first look; the engine is open source, rules are readable and editable, and the hosted free tier allows 10 contributors. Snyk is better where dependencies and known vulnerabilities matter as much as your own code. Codacy and DeepSource are the closest hosted replacements for quality gates on pull requests, with free entry points and no server to patch. GitHub CodeQL suits public repositories already on GitHub. The trade-off to accept is rule coverage: SonarQube's maintainability metrics, duplication and technical debt reporting have no exact equivalent in the security-first tools, so you may need two tools, not one. Run the candidate on one repository next to SonarQube for a sprint and compare findings; false-positive rates differ more than feature lists suggest, and thresholds in your CI will need rewriting.
Quick comparison
| Tool | Price | Platforms | Best for | Tested |
|---|---|---|---|---|
| Semgrep | Free (up to 10 contributors); paid from $30 per contributor/month (Teams, Code or Supply Chain; Secrets $15) | CLI, CI, Semgrep Cloud | Security-focused scanning in CI | Docs only |
| Codacy | Free (Developer plan, free forever, includes IDE plugin and SAST, SCA and secrets scans); paid from $18 per dev/month, billed yearly (Team; $21 monthly) | Web, IDE plugins | Hosted quality gates for small teams | Docs only |
| DeepSource | Free (free for open-source projects); paid from $24 per user/month, billed yearly (Team) | Web | Open-source projects and PR feedback | Docs only |
| Snyk | Free (100 Snyk Code tests per month); paid from $25 per month, Team plan for up to 10 developers (1,000 Snyk Code tests) | Web, CLI, IDE plugins | Vulnerability and dependency scanning | Docs only |
| GitHub CodeQL code scanning | Free (listed for public repositories on the Free plan) | GitHub | Open-source projects hosted on GitHub | Docs only |
Independent comparison. Paid placements are labelled separately; editorial links earn no affiliate commissions. Learn more.
Good fit if
- You mainly want security findings in CI (Semgrep is the pick)
- You want hosted quality gates with a free plan (Codacy is the pick)
- You care about vulnerable dependencies (Snyk is the pick)
- Your project is open source (DeepSource is the pick)
- Your public repositories already live on GitHub (GitHub CodeQL code scanning is the pick)
Not ideal if
- You rely on SonarQube features or integrations that these tools do not replicate
SonarQube today: Free (Community Build is free; SonarQube Cloud free up to 50k lines of code on private projects) (SonarQube pricing, checked 2026-10-22).
Why people look for SonarQube alternatives
SonarQube's paid server editions, Developer, Enterprise and Data Center, are priced per instance per year based on lines of code, and the pricing page lists no figures. The Community Build is described as an open source edition for developers and small teams. SonarQube Cloud is free for private projects up to 50k lines, then the Team plan starts at $34 a month for up to 100k lines; only the largest branch of each project counts toward the limit. Enterprise is custom priced, with commercial support included starting at 5M lines. Costs therefore follow codebase size.
Semgrep
Compared with SonarQube: LGPL-2.1 open-source scanner for security patterns, with a hosted platform that is free for up to 10 contributors. Stronger on security rules than SonarQube, lighter on code-smell and maintainability metrics; Teams is $30 per contributor.
Price: Free (up to 10 contributors); paid from $30 per contributor/month (Teams, Code or Supply Chain; Secrets $15) (Semgrep pricing, checked 2026-10-22).
Platforms and license: CLI, CI, Semgrep Cloud. LGPL-2.1 (Semgrep CE engine) (open source).
Project activity: 17.3k GitHub stars · latest release v1.182.0 (Oct 20, 2026) · last commit Oct 28, 2026
Best for: Security-focused scanning in CI.
Worth knowing: The open-source engine is free; the managed platform has the contributor limits.
Codacy
Compared with SonarQube: Hosted code quality and security with a free Developer plan including IDE plugins. Team starts at $18 per developer a month billed yearly. Less self-hosting control than SonarQube Community Build, but nothing to run.
Price: Free (Developer plan, free forever, includes IDE plugin and SAST, SCA and secrets scans); paid from $18 per dev/month, billed yearly (Team; $21 monthly) (Codacy pricing, checked 2026-10-22).
Platforms and license: Web, IDE plugins. Proprietary SaaS.
Best for: Hosted quality gates for small teams.
Worth knowing: Prices are 'starting at'.
DeepSource
Compared with SonarQube: Hosted static analysis free for open-source projects, with Team at $24 per user a month billed yearly. Fewer language and rule options than SonarQube, but quick setup and auto-fix suggestions on pull requests.
Price: Free (free for open-source projects); paid from $24 per user/month, billed yearly (Team) (DeepSource pricing, checked 2026-10-22).
Platforms and license: Web. Proprietary SaaS.
Best for: Open-source projects and PR feedback.
Snyk
Compared with SonarQube: Security-first scanner whose free plan gives 100 Snyk Code tests a month; Team is $25 a month for up to 10 developers. Better on dependencies and vulnerabilities than SonarQube, with weaker maintainability reporting.
Price: Free (100 Snyk Code tests per month); paid from $25 per month, Team plan for up to 10 developers (1,000 Snyk Code tests) (Snyk pricing, checked 2026-10-22).
Platforms and license: Web, CLI, IDE plugins. Proprietary SaaS.
Best for: Vulnerability and dependency scanning.
GitHub CodeQL code scanning
Compared with SonarQube: Code scanning inside GitHub, listed for public repositories on the Free plan. No server to host, unlike SonarQube, but it is tied to GitHub and private repositories need a paid add-on so check the vendor page for its price.
Price: Free (listed for public repositories on the Free plan) (GitHub CodeQL code scanning pricing, checked 2026-10-22).
Platforms and license: GitHub. Proprietary engine; CodeQL queries MIT.
Best for: Open-source projects hosted on GitHub.
Which one to pick
- You mainly want security findings in CI: Semgrep
- You want hosted quality gates with a free plan: Codacy
- You care about vulnerable dependencies: Snyk
- Your project is open source: DeepSource
- Your public repositories already live on GitHub: GitHub CodeQL code scanning
Limits of this review
Docs-only for Semgrep, Codacy, DeepSource, Snyk, GitHub CodeQL code scanning: we did not install or run them, so feature claims come from vendor pages and we did not test import from SonarQube. Vendor prices and free limits change; confirm on the linked pricing page before you buy or migrate.
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Kevin Fan
Kevin Fan is a SaaS founder. He runs Free Instead Of, which tracks free and open-source alternatives to paid software and checks each price and free-plan limit against the vendor's own pages.
Methodology
Based on official pricing and product pages checked 2026-10-22: SonarQube, Semgrep, Codacy, DeepSource, Snyk, GitHub CodeQL code scanning. Prices, free limits and licenses are the figures shown on those pages on those dates. No tool on this page was installed or run. No accounts were created.