ClusterFuzz vs OSS-Fuzz
ClusterFuzz
google.github.io
OSS-Fuzz
google.github.ioSide by side
| Figure | ClusterFuzz | OSS-Fuzz |
|---|---|---|
| Price from | Free | Free |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | — | — |
| Web | Yes | Yes |
| Windows | Yes | — |
| macOS | Yes | — |
| Linux | Yes | — |
| Self-hosted | Yes | — |
| Plans published | 1 | 1 |
| Spec score · Fuzz Testing Software | 8.9 (#2) | 7.3 (#19) |
| Fuzzing engines | It supports libFuzzer, AFL++, and Honggfuzz for coverage-guided fuzzing, as well as blackbox fuzzing. | The documentation lists libFuzzer, AFL++, Honggfuzz and Centipede, with Centipede identified as experimental in the FAQ. |
| Purpose | ClusterFuzz is scalable fuzzing infrastructure that finds security and stability issues in software. | OSS-Fuzz runs fuzzers for open-source projects and privately alerts developers to bugs it detects. |
Plans
In their own words
ClusterFuzz
ClusterFuzz is open-source infrastructure for finding security and stability problems in software through fuzzing. It supports coverage-guided engines libFuzzer, AFL++, and Honggfuzz, alongside blackbox fuzzing. Its workflow can find crashes, group duplicates, minimize testcases, use bisection to locate regressions, and verify fixes. It can also file, triage, and close bugs automatically. Google uses ClusterFuzz across its products and as the fuzzing backend for OSS-Fuzz. The system is designed to run on clusters of any size; Google’s instance runs on 30,000 VMs. Production deployments use Google Cloud services, including App Engine, Cloud Storage, Cloud Datastore, Cloud Pub/Sub, BigQuery, and Stackdriver Logging and Monitoring. Local instances are supported on Linux and macOS, with some BigQuery- and Stackdriver-dependent features disabled. Although the overview mentions Monorail and Jira as examples, the architecture currently supports only Chromium-hosted Monorail. The software runs on Linux, macOS, and Windows and is licensed under Apache-2.0. Its listed price is free.
OSS-Fuzz
OSS-Fuzz has no write-up on Specifiction yet; its figures are above.