Fuzze.rs vs ClusterFuzz
ClusterFuzz is powerful, but operating it is its own full-time job. Fuzze.rs gives you the same outcomes without the infrastructure burden.
ClusterFuzz is the open-source backbone behind OSS-Fuzz and Chrome's fuzzing programme.
Running your own ClusterFuzz cluster means standing up GCP / AWS infra, App Engine, datastore, bot pools, and ongoing maintenance.
Fuzze.rs delivers the same fuzzer set with a managed dashboard and REST API — no infrastructure to operate.
Side-by-side
| Feature | Fuzze.rs | ClusterFuzz | Edge |
|---|---|---|---|
| Infrastructure required | None — fully managed | GCP App Engine + datastore + bot pools | |
| Time to first crash | Hours (push a Dockerfile, start job) | Days to weeks (deploy cluster, configure) | |
| Fuzzers supported | AFL++, libFuzzer, Centipede, Honggfuzz | AFL++, libFuzzer, Honggfuzz, Centipede | |
| Maintenance burden | Zero — we operate the platform | Ongoing — patches, bot fleet, storage | |
| Crash triage UI | Per-job dashboard, dedup, stack traces | Built-in, requires self-hosted UI deployment | |
| REST API for CI/CD | First-class, documented | Available, requires client tooling | |
| Cost predictability | Flat monthly per compute tier | Variable GCP usage + engineering time | |
| Source code transparency | Closed-source platform, OSS fuzzers | Fully open-source (Apache 2.0) |
Pick Fuzze.rs when
- You don't want to maintain App Engine apps, bot worker pools, datastores, and credentials yourself.
- You need fuzzing results in days, not the weeks a self-hosted deployment takes to stabilise.
- Your team's time is better spent on fuzz harnesses and triage than on cluster operations.
- You want a single REST API to drive jobs from CI/CD, without writing your own client tooling.
Pick ClusterFuzz when
- You have dedicated SRE / infra capacity and want full source-level control of the fuzzing platform.
- Your security posture requires every byte of fuzzing infra to live inside your own cloud account.
- You're already a Google Cloud shop and the GCP-native deployment is genuinely cheaper than a managed plan at your scale.
FAQ
Is Fuzze.rs built on top of ClusterFuzz?
No. Fuzze.rs runs the same upstream fuzzers (AFL++, libFuzzer, Honggfuzz, Centipede) on its own purpose-built scheduling and reporting layer. We don't depend on the ClusterFuzz codebase.
Can I migrate from a self-hosted ClusterFuzz cluster to Fuzze.rs?
Yes. Your fuzz harnesses are portable — they're standard libFuzzer or AFL++ targets. Most teams migrate by re-pointing their CI step from their ClusterFuzz API to the Fuzze.rs REST API.
What about ClusterFuzzLite for CI-only fuzzing?
ClusterFuzzLite is a good fit for short fuzz runs inside a CI job. Fuzze.rs covers a broader use case — continuous long-running fuzzing, scheduled campaigns, and persistent crash tracking.
First month 50% off. Cancel anytime.