Hey everyone. I just finished a year-long project migrating our SAST from Fortify to Semgrep at my company. Wanted to share some notes, since this forum was super helpful when I was researching.
The main driver was cost and speed. Fortify scans were taking hours. With Semgrep, we got most scans down to minutes by integrating it into our CI/CD pipelines. The learning curve was steep for writing custom rules (coming from a Linux admin background), but the community rules and the Semgrep Registry saved us a ton of time initially.
Biggest win? The developers actually use it. The faster feedback and clearer error messages mean they fix things before merging. We still have some gaps in coverage for certain frameworks compared to Fortify, but we're closing them slowly with custom rules. Overall, a positive shift for our security posture and dev experience. Happy to answer any basic questions from another beginner's perspective!
I'm the security lead for a fintech's platform group, managing the appsec pipeline across about 300 devs. We've run both tools: Fortify on-prem for legacy monoliths and Semgrep Cloud for everything born in the last three years.
* **Deployment & Dev Experience:** Fortify is a suite you install; getting the SCA and scan engines talking in CI was a multi-quarter infrastructure project. Semgrep's SaaS model got us vulnerability checks in PRs in a sprint. The speed difference is absolute: Fortify full scans on our main codebase took 4-6 hours. Semgrep completes in under 8 minutes. Developer adoption isn't a soft metric; it's a direct function of feedback latency.
* **Rule Writing & Customization:** Fortify's custom rules are Java-based and require a deep dive into their AST. It's powerful for complex data-flow, but it's specialist work. Semgrep's pattern matching feels like grep++. My team, who are ex-developers, wrote their first custom rule for a bespoke API framework in an afternoon. The trade-off is semantic depth; Fortify's taint tracking still catches some sneaky vulnerabilities our Semgrep rules miss.
* **Total Cost & Licensing:** Fortify's annual quote wasn't just per-seat; it was per-core for the scan engines, plus maintenance, plus the VMs to run it. All-in, it was a six-figure line item. Semgrep Cloud lists at $45/seat/month billed annually for the platform tier we use. The hidden cost with Semgrep is in-house expertise time to build out custom rules for proprietary frameworks, which is a real consideration if your stack is unique.
* **Enterprise Integration & Oversight:** This is Fortify's home turf. Its audit trails, role-based access control, and report formatting for compliance audits (think SOC2) are baked-in and mature. With Semgrep, we had to build more of that ourselves via their API and feed data into our own SIEM. For a large, regulated environment, Fortify's out-of-the-box governance is a tangible reduction in operational burden.
I'd recommend Semgrep for any shop with a cloud-native, multi-repo setup that needs to move fast and has some appsec bandwidth to tailor rules. Stick with Fortify if you're in a heavily regulated industry (think healthcare, core banking) with a few massive, ancient codebases and your primary buyer is the CISO office, not engineering. If you're on the fence, tell me your team's ratio of appsec engineers to developers and whether you need FedRAMP authorization.
Attribution is a lie, but we need the lie.
That point about developers actually using it is everything. So many security tools get built and then ignored because they're a bottleneck. Getting that fast feedback loop into the pipeline changes it from a "security check" to just part of coding.
The rule gap you mentioned is real. We hit that too, especially with some in-house libraries. One thing that helped us bridge it was pairing a senior dev with a sec engineer for a few afternoons to crank out a handful of those custom rules together. The dev understood the patterns, the sec person understood the Semgrep syntax, and the collaboration built a ton of goodwill.
Glad your shift worked out! The speed difference alone must feel like a breath of fresh air.