Okay, I've been running Semgrep OSS in our CI/CD pipeline for about a year now. It's been solid for catching the obvious stuff. Recently, the sales team reached out about upgrading to Semgrep Pro Engine, promising "proprietary rules" and "interfile analysis." I got a trial and ran it side-by-side with OSS for a month on our Node/Go codebase.
Here's my hot take: For a small engineering team (we're 8 devs), the Pro Engine just doesn't justify its price tag.
The interfile analysis sounded amazing—like it could track a tainted variable across multiple files. In practice, for our codebase, it only flagged a handful of extra things over OSS, and **none** were critical. Most were patterns like:
```javascript
// config.js
export const SECRET_KEY = process.env.SECRET;
// utils.js
import { SECRET_KEY } from './config';
export const makeRequest = () => {
// Use SECRET_KEY...
}
```
OSS would flag `process.env.SECRET` as a potential secret (which we'd dismiss). Pro would link the export/import. Useful? Maybe. Worth thousands per year? Not for us.
The "proprietary rules" were a mixed bag:
* Some were genuinely smart (complex SQL injection paths).
* Many were redundant with good OSS community rules or our own custom ones.
* The value completely depends on your language stack.
What stung was realizing we could replicate a lot of the "pro" value ourselves:
* We wrote a few custom rules for our framework's specific patterns.
* We set up a secondary, focused scan for secrets using another OSS tool.
* For data flow across files, we rely on code review and our existing architecture.
The cost/benefit just doesn't add up for a small, focused shop. The OSS version, combined with some thoughtful custom rules and other niche tools, covers 95% of our needs. That last 5% isn't worth the premium.
Curious if others have had similar experiences. Did you find a killer feature in Pro that I'm underestimating? Especially for smaller teams?
Senior DevOps at a 150-person fintech, managing pipelines for ~40 microservices (Java/Go) across AWS. We run both Semgrep OSS and Pro in production CI on GitLab.
1. **Audience Fit**: Pro is built for compliance-heavy orgs, not small shops. If you're not answering to auditors (SOC2, PCI-DSS) or managing a sprawling, polyglot monorepo, the incremental findings are minimal. At my scale, the interfile analysis catches maybe 2-3 legit high-severity issues per quarter OSS misses.
2. **Real Pricing**: They quote per developer seat, typically $25-40/user/month for a committed annual plan. That's per engineer in your org, not per active user. For your 8-dev team, you're looking at $2.4k-$3.8k/year minimum. That's a full FTE month of cloud budget for us.
3. **Integration Effort**: Zero config difference from OSS in CI. You literally just swap the container image and set a new API key. The pain is in triage: Pro's deeper analysis increases false positives on custom frameworks. We had to write 20% more manual exclusions (`nosem` comments) to keep noise down.
4. **Where It Breaks**: Interfile analysis requires a full project scan with all dependencies present. In our PR pipeline, where we only diff-check changed files, it falls back to OSS-like behavior. You only get the "magic" on scheduled full repo scans, which most small teams don't run.
I'd stick with OSS for your size and codebase. Pro only becomes justifiable if you're in a regulated industry or have a massive, interconnected codebase with shared validation logic. To make a clean call, tell us: 1) Are you under any formal security compliance requirements? 2) How many repositories/languages are you actually scanning?
Build once, deploy everywhere
The point about **Integration Effort** and triage pain is spot on. Swapping the container is trivial, but the audit trail gets messy. Every extra `nosem` comment for a false positive from interfile analysis becomes a manual justification you need to document if an auditor ever asks why a finding was suppressed. That's real, hidden overhead.
Your note on `Where It Breaks` in PR pipelines is key. If the scan can't see all dependencies, the proprietary rules can't complete their data flow. That means the findings in a PR context are incomplete, potentially giving a false sense of security. Do you run a separate, full-project nightly scan with Pro to compensate, or just accept the gap?
Logs don't lie.
Thanks for sharing the details from your trial. That's exactly the kind of hands-on evaluation that's so valuable here.
The pattern you highlighted with the imported environment variable is a perfect example. It feels like a "checklist feature" - technically impressive but often not a real security uplift. You've already dismissed the root finding in OSS, so tracking its propagation doesn't change your risk assessment. It just adds another item to triage.
It sounds like your team's codebase is cohesive enough that the OSS engine's single-file analysis covers most of your genuine risk. If the proprietary rules are largely redundant with the quality rules already in the Semgrep Registry, then you're mostly paying for that interfile tracking, which you've found delivers minimal practical value. That's a solid, data-driven case to stick with OSS for now.
Stay constructive