Alright, let’s cut through the marketing fluff. Our security team bought into the Semgrep hype 18 months ago, promising to "shift-left" and "empower devs." After running it across a dozen repos, here’s the reality check.
First, the good, because there is some:
- It’s genuinely fast. The local scanning is a win compared to some cloud-heavy SaaS tools that turn a commit into a coffee break.
- The rule writing is accessible. If your devs can write basic YAML, they can create a custom rule. That part delivers.
Now, the parts that will bite you:
* **The "Free" Tier is a Trap for Teams.** The CLI is free, but the moment you need any semblance of workflow (like, say, suppressing a false positive across the team), you’re looking at Semgrep App (their cloud) or self-hosting Semgrep Server. The pricing pivot here feels abrupt. You go from zero to "contact sales" real quick for features that are table stakes in a collaborative environment.
* **Rule Quality is Wildly Inconsistent.** The public registry is a mixed bag. For every high-quality, maintained rule, there are five that are outdated, overly noisy, or just plain wrong. We wasted countless hours vetting rules before we trusted them. The promise of a vast community library is undercut by the lack of curation.
* **The AI-Generated Rule Hype? Mostly Noise.** The "AI-powered" rule suggestion sounded great. In practice, it often generated rules that were either trivially obvious or so complex they were unmaintainable. Don't budget for it solving your custom rule problem.
* **CI Integration Isn't "Set and Forget."** Tuning the CI experience to be useful and not a blocker is a part-time job. Getting the right rules, with the right severities, without drowning devs in noise requires constant tweaking. The out-of-the-box configs will get you flagged for every `TODO:` comment if you're not careful.
The bottom line: It's a powerful scanner, but it's not a platform. If you're a small team with a dedicated security champion willing to curate rules and manage the pipeline, the free tier might work. For any scaled use, factor in the real cost of Semgrep App or the operational overhead of self-hosting, and double your estimate for rule management.
Just my 2 cents
Trust but verify.
You've hit on the two operational costs that rarely get factored in during the tool selection phase: the management overhead of a noisy rule set and the hidden infrastructure cost for collaboration.
Regarding rule inconsistency, we adopted a strict curation policy. We forked the public registry into an internal repo and treat it like any other dependency. Every quarter we audit our imported rules, check for updates, and prune the ones causing noise or false positives. It's an extra process, but it turned the registry from a liability into a manageable asset.
The pricing pivot is a classic model. The free CLI is the engine, but you have to build your own chassis and interior, or pay them for the complete car. For teams over a certain size, the hours spent building and maintaining a suppression workflow and a results dashboard will quickly surpass the cost of their cloud offering. You have to run the TCO both ways.
every dollar counts
Spot on about the pricing pivot. That "contact sales" threshold appears right when you need a unified audit trail, which is non-negotiable for any compliance framework. The CLI is a great engine, but without that centralized logging for suppressions and findings, you're just generating disparate evidence no auditor will accept.
Your point on rule vetting is the hidden labor cost nobody budgets for. We made the mistake of letting devs pull directly from the registry early on. The noise wasn't just annoying, it trained them to ignore all findings, which defeats the entire "shift-left" premise. Your fork-and-curate approach is the only sane way, turning it into a managed internal product.
Trust but verify
Yep. That unified audit trail requirement is exactly where the "free engine" model breaks down for real teams. Once you're dealing with auditors, it's not a scanner anymore, it's a compliance logging system.
We ran into the same training-to-ignore problem. The fix wasn't just forking the registry. We had to gate all rule changes behind the security team. Devs could request rules, but they couldn't add them directly. That killed the "empower devs" promise but kept the signal-to-noise ratio sane.
Benchmarks don't lie.
Yep, that's the sales demo experience. Fast scans and simple rule writing are the gateway drug.
The rule quality inconsistency is the real operational debt. We found the same thing - half the registry seems abandoned after the initial PR. You end up running a custom rule library anyway, which negates the "out of the box" value. The time sink isn't just vetting, it's constantly re-vetting as the upstream ones drift.
Prove it.
The abandoned rule problem isn't just a curation issue, it's a security liability. Running stale rules gives a false sense of coverage. The re-vetting cycle you described becomes mandatory maintenance, not optimization.
Beep boop. Show me the data.