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Start with fundamentals, then move into provider-specific webhook testing and production hardening.

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These pages explain what each tool does, when to use it, and how it fits into a webhook debugging workflow.

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Use these setup guides when you want forwarding rules, custom responses, security checks, or multi-destination fanout.

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Use these pages to compare developer workflows, pricing tradeoffs, and feature differences between webhook tools.

Quick Answer

Mockoon is a desktop app — it mocks locally on your machine. When CI, a remote teammate, or a third-party service needs to hit the same endpoint, Mockoon's local server isn't reachable without ngrok or port forwarding. Requex mock servers are hosted: a stable public HTTPS URL is live immediately, no tunneling needed.

Mockoon Alternative — Mock APIs That Are Actually Reachable

Mockoon is a solid local mock tool. But "local" is the limiting word. This page covers what changes when you need your mock API to be a real HTTPS endpoint anyone can hit.

Last updated: April 2026 • 7 min read

Mockoon's Limitation: It's Only on Your Machine

Mockoon is well-designed. The desktop GUI is clean, and it supports a good range of route options. But the moment you need another developer, a CI job, or a webhook from Stripe to hit your mock, you have a problem: Mockoon runs on localhost.

The typical workaround is adding ngrok or Cloudflare Tunnel in front of Mockoon. That works — but now you're managing two tools, restarting tunnels, and dealing with ephemeral URLs that change on restart.

Requex mock servers bypass this entirely. Every server gets a permanent api.requex.me/mock/{id} URL. No local process. No tunneling. Share it with your team and it works.

Feature Comparison: Requex vs Mockoon

FeatureRequex.meMockoon
Hosted (no local process)✓✗ (desktop only)
Stable public HTTPS URL✓Needs ngrok/tunnel
Accessible from CI✓Only with tunnel
Route params (:id)✓✓
Per-method responses✓✓
Response delay✓✓
Conditional responses✓ (header/query/body rules)✓ (rules engine)
Auth simulation✓ (Bearer, HMAC, API key, Basic)Limited
Webhook inspection✓ (real-time WebSocket)✗
No install required✓ (browser)✗ (desktop app)
PriceFreeFree (desktop) / paid cloud

Mockoon data sourced from mockoon.com — as of April 2026.

Where Mockoon Beats Requex

Mockoon has deeper local tooling. Its GUI allows complex templating (Handlebars/Faker.js helpers), response rules based on request body paths, and data buckets for simulating stateful APIs. If you're building a full API simulation offline — no internet, no external endpoints — Mockoon is excellent.

Requex focuses on the hosted, shareable workflow. The conditional logic is simpler (header/query/body matching) but covers most practical cases. If you need Faker.js templating or offline development, Mockoon is worth keeping.

The CI/CD Problem with Local Mock Tools

Frontend teams often hit this wall: the mock works on the developer's machine, but the CI build fails because it can't reach localhost. The standard fixes — spin up the mock in CI, add a Docker image, configure port exposure — all add complexity to the pipeline.

With Requex, the CI job hits the same URL your local dev environment uses. No extra setup. The endpoint is always live because it's not tied to any local process.

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