Kusari vs Sigstore

Kusari is a software supply chain security platform that maps components across repositories, images, and pipelines in an evolving knowledge graph called the Trust Fabric. It builds that graph from source and build artifacts and enriches each node. Its Kusari Score weighs technical severity alongside reachability, exploitability, blast radius, effort to fix, ownership, and license. The platform accepts source and build artifacts, CycloneDX and SPDX SBOMs, VEX, and existing scanner output. Inspector reviews pull requests through GitHub, GitLab, or the CLI, returning a merge decision and a fix. Its checks cover vulnerabilities, transitive dependencies, secrets, typosquatted packages, licensing, unmaintained components, code weaknesses, and pipeline or image configuration. Reviews can include up to 2,000 dependency changes, with up to 1,000 high-priority changes examined in depth. Kusari lists integrations including GitHub, Jenkins, Jira, ServiceNow, Slack, and Microsoft Teams. The free plan includes unlimited public repositories and one private repository; Starter Team is $50 a month, with a 30-day free period.

Sigstore is a free, open source project for signing and verifying software artifacts to improve supply chain security. It supports release files, container images, binaries, software bills of materials, and more. Signatures use temporary keys, so developers do not have to manage signing keys; events are recorded in a tamper-resistant public log for audit. Its components include Cosign, Fulcio, Rekor, OpenID Connect, and Policy Controller. Cosign signs and verifies artifacts and stores signatures in an OCI registry. Fulcio issues temporary certificates to authorized identities, while Rekor keeps signed metadata in a searchable ledger. OpenID Connect authenticates users through providers such as GitHub and Google. The trust root uses The Update Framework and is maintained by five keyholders from different companies and academic institutions. Sigstore provides GitHub Actions, documents GitLab CI installation, and offers official clients for Go, Java, JavaScript, Python, Ruby, and Rust. It supports API, Linux, macOS, Windows, and self-hosted environments. One integration caveat is that Cosign has no API stability guarantees, does not follow semantic versioning, and is not recommended for application integration because of its dependencies.