Comparison page
FetchSandbox as a Postman Mock Alternative
Postman mocks are good when you need a fast stub. They get less helpful when the bugs you care about live in state, retries, and the steps after the first request.
Where Postman mocks are strong
Postman is great for request authoring, collections, and quick static mocks. If your team needs example responses during early frontend work, that can be enough.
Where FetchSandbox is different
FetchSandbox starts to make more sense when the team is tired of proving one mocked response works while the real integration keeps failing two or three steps later. That is the gap we care about. For the head-term framing (sandbox for APIs vs mock server), see API sandbox and FetchSandbox vs Postman.