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Migration guides, technical deep-dives, and the strategy behind SpecShield.
Optic was archived on January 12, 2026. How to move your OpenAPI breaking-change checks off it: CI examples, honest alternatives, and the gaps to plan for.
We scanned 1,939 GitHub repositories. Of the 85 with a real first-party OpenAPI spec, 81 had no breaking-change check in CI. Method, data, and corrections.
Both catch breaking changes in OpenAPI specs, but they solve different problems. Rule depth, hosting, PR workflow, and when to pick each.
PactFlow invented bi-directional contract testing and is the enterprise category leader. SpecShield is the lighter, OpenAPI-native, cheaper alternative. An honest comparison of CDCT vs BDCT, the Pact ecosystem, pricing models, and who each is really for.