The Semgrep CLI installs in 30 seconds and immediately starts finding bugs in your code. No credit card. No account creation. No corporate handshake required. So why do thousands of teams pay $35 per developer per month for the cloud version?
Because the free tier is playing checkers while the paid version plays chess.
The Free Semgrep Situation (It’s Actually Not a Trap)
Let’s be honest: open-source security tools have a reputation. They ship half-baked, then spend three years adding features that should’ve shipped day one. Semgrep OSS isn’t that story.
The open-source command-line scanner is a real product that real teams run in production. It’s fast—10 seconds for most codebases—and it speaks 30+ languages including Python, JavaScript, Go, Java, Rust, and a dozen others. You get 2,800 community-maintained rules covering OWASP Top 10 stuff: SQL injection in Django, XSS in React, insecure deserialization in Java. The usual suspects.
Better: you can write custom rules in YAML that detect security patterns specific to your codebase. Banning deprecated APIs, enforcing logging standards, catching architectural violations—this is where Semgrep OSS actually shines. For teams that need to enforce internal standards, the custom rule system is genuinely powerful and costs nothing.
“The scanning engine is the same binary that powers the commercial platform. The difference is not in the engine itself but in which analysis modes are enabled.”
That quote matters. Semgrep isn’t artificially crippling the free version. The same binary runs everywhere. The difference is which analysis modes flip on.
Why You Should Probably Still Pay
Here’s where the pitch gets uncomfortable. Independent testing shows the free CLI catches 44-48% of vulnerabilities. The paid Pro engine? 72-75%.
That’s not a rounding error. That’s half your bugs staying invisible.
Why the gap? Single-file analysis vs. cross-file dataflow tracking. The free CLI analyzes each file in isolation—it can catch a SQL injection if the vulnerable code lives in one place. But if the attack surface spans multiple files? If tainted user input flows from one module to another to another? The free version can’t trace that chain. It’s like checking a building’s foundation one room at a time instead of understanding the load-bearing walls.
The paid Cloud Platform adds:
Cross-file dataflow analysis. Traces how data moves through your entire codebase, not just within single files.
20,000+ Pro rules. These aren’t community contributions—they’re proprietary, battle-tested rules built by Semgrep’s team. They catch more variants, produce fewer false positives, and cover edge cases the open-source rules miss.
Software composition analysis with reachability. It doesn’t just flag vulnerable dependencies—it checks if your code actually calls the vulnerable function. (Most SCA tools don’t. This matters.)
Secrets detection and AI-powered triage. The free version doesn’t have this at all. The paid version finds hardcoded API keys, database credentials, and SSH keys—then uses machine learning to cut false positives by 80%+.
Centralized dashboard. For teams with 50+ developers and 100+ repositories, managing Semgrep from the CLI becomes untenable. The cloud dashboard gives you visibility, policy enforcement, and integrated issue tracking.
So the real question isn’t “Is Semgrep free?” It’s “Is Semgrep’s free tier enough for your security needs?”
When Free Is Actually Fine
Semgrep OSS works if:
You’re a small team (under 20 developers) that can afford to miss half your vulnerabilities in exchange for zero cost and zero operational overhead. You’re okay with catching obvious, single-file security issues but missing complex dataflow vulnerabilities.
You care more about enforcing internal standards than finding every bug. Semgrep’s custom rule system for YAML is phenomenal for this—and it’s free.
You’re building a new internal security tool and need a scanning engine that doesn’t require a commercial license. The LGPL-2.1 license gives you that freedom.
You’re in a highly regulated environment (finance, healthcare, government) where you need to prove you’re using an open-source tool with no vendor lock-in. This matters more than you’d think.
The Pricing Reality
$35 per contributor per month on the Team plan. Custom pricing for Enterprise (usually 2-3x the Team plan cost). No per-scan fees, no repository caps, no seat-counting games—just headcount.
For a 50-person engineering team, you’re looking at $21,000 a year. That’s meaningful. For a 500-person organization, it’s $210,000. At that scale, Semgrep’s management dashboard and integration with your existing security workflow probably justifies it. At smaller scales, you’re betting that the extra 24-27% vulnerability detection is worth the cash.
The Uncomfortable Truth
Semgrep is doing something interesting here: shipping a genuinely useful free product while also shipping a genuinely better paid product. Most companies either gimp the free tier (hello, npm) or give away so much that the paid version feels unnecessary.
Semgrep’s balance isn’t perfect. The 44-48% vs. 72-75% gap feels like it could be narrower if they invested more in cross-file analysis for the free tier. And the marketing around “2,800 community rules” is slightly misleading—rule count doesn’t matter if half of them are low-quality or too narrow for real-world code.
But the underlying product design is honest. They’re not punishing you for using the free version. They’re just charging for capabilities that genuinely are harder to build and maintain—cross-file analysis, proprietary rules, AI triage, operational tooling.
Should You Switch to Semgrep?
If you’re currently using nothing, Semgrep OSS is a no-brainer—it’s free and it’s solid. If you’re paying for another SAST tool and getting 60-70% coverage for 5x the cost, Semgrep Cloud is probably a win. If you’re using Snyk or Checkmarx and you’re happy, there’s no emergency to move.
But if you haven’t kicked the tires on Semgrep in the last year, now’s the time. The free version is legitimate. The paid version is faster and smarter. And the custom rule system is genuinely better than what competitors offer at any price point.
Just go in with eyes open about what “free” actually includes. It’s not a trial. It’s not a trap. It’s a real tool with real limitations. That clarity is rare in software. Worth respecting.
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Frequently Asked Questions
Is Semgrep free for production use?
Yes. The Semgrep CLI is open-source under LGPL-2.1, and you can run it in production without paying or creating an account. No restrictions on usage, repositories, or number of scans. The limitation is technical (single-file analysis), not commercial.
What’s the difference between Semgrep OSS and Semgrep Cloud?
Semgrep OSS is a free command-line scanner with single-file analysis and 2,800 community rules. Semgrep Cloud ($35/developer/month) adds cross-file dataflow analysis, 20,000+ proprietary rules, software composition analysis, secrets detection, AI triage, and a centralized dashboard. The same scanning engine powers both—the difference is which analysis modes are enabled.
Does Semgrep OSS catch enough vulnerabilities?
Depends on your risk tolerance. Independent testing shows it catches 44-48% of vulnerabilities compared to 72-75% for the paid Pro engine. For obvious, single-file issues it’s solid. For complex dataflow vulnerabilities spanning multiple files, it misses a lot. Small teams with limited security needs might find it sufficient; larger organizations usually need the paid version.
