Gostly vs the alternatives

Beeceptor is a hosted, rule-authored mock service. Gostly is self-hosted and records real traffic — replayed byte-for-byte inside your perimeter. Where each one wins.

How Gostly differs from WireMock: traffic-derived libraries, structural redaction, and an AI-at-the-edge match cascade rather than hand-written stub mappings.

How Gostly differs from Mockoon: real-traffic learning vs hand-built mocks, with tenant-aware persistence.

How Gostly differs from Postman Mock Servers: in-process replay, tenant isolation, no manual mock authoring.

Mountebank virtualizes services with hand-authored imposters and predicates on Node. Gostly records your real upstream and replays it byte-for-byte from a self-hosted stack in your perimeter (Docker Compose). Where each one wins.

Prism mocks your OpenAPI spec. Gostly records your real upstream and replays it byte-for-byte. Polymorphism, drift, and stateful flows where Prism falls short.

How Gostly differs from Microcks: contract-light, traffic-derived, structural security model.

How Gostly differs from Hoverfly: learning from real traffic, structural redaction, AI-only-at-the-edge match cascade.

How Gostly differs from Speedscale and proxymock: the whole product runs in your perimeter with Docker Compose, no Speedscale account, no kernel-privileged DaemonSet, and a mock miss that never falls through to the live provider.

Keploy is a genuinely open eBPF recorder that auto-generates CI test cases. Gostly serves the recording as durable, standing infrastructure from a userspace proxy — no eBPF, no kernel privileges, cross-platform — with recorded traffic and source code that never leave your host.

How Gostly differs from llmock, aimock, and VCR-style LLM cassettes: a self-hosted proxy you point your agent's provider base URL at — record real model responses and replay them deterministically, in your own perimeter, with drift detection and statechart state for multi-step tool flows.