Dev tools · alternatives · 2026

Mock FedCM Integrations is a free testing tool that provides both a Relying Party and Identity Provider for developers working with FedCM (Federated Credential Management) authentication. It allows developers to… Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes.

1. 1
   Mockaroo▲354

   A realistic data generator to test your app

   2015 · mockaroo.com · its alternatives →

2. 2
   Mocke▲519

   Mock email campaigns: know your reply rate without launching

   2025 · mocke.co · its alternatives →

3. 3
   HTTP Mock – Intercept, debug and mock HTTP(S) with zero setup▲341

   Beautiful, cross-platform & open-source tools for debugging, testing and building with HTTP(S), on Windows, Linux & Mac.

   2019 · httptoolkit.tech · its alternatives →

4. 4AF
   A fake SMTP server for software integration testing▲127

   This is a side project of mine. Use this as your SMTP server in a test environment to guarantee that your users don't receive test emails. Looking for feedback, especially on the security side.

   2024 · fakemail.stream · its alternatives →

5. 5
   Secure MCP Framework by Arcade.dev▲272

   Skip migration and launch MCP with built-in Auth

   Nov 2025 · arcade.dev · its alternatives →

6. 6FS
   Fake SMTP server as a service▲149

   2017 · develmail.com · its alternatives →

7. 7
   MockIPFS – a mock node and MitM proxy for IPFS testing and debugging▲29

   Powerful friendly IPFS mock node & proxy. Contribute to httptoolkit/mockipfs development by creating an account on GitHub.

   2022 · github.com · its alternatives →

8. 8
   Mockplus Cloud Beta▲67

   Handoff designs with accurate specs, assets, code snippets

   2018 · mockplus.com · its alternatives →

9. 9
   Mock SAML▲9

   A free SAML 2.0 Identity Provider for testing SAML SSO

   2022 · mocksaml.com · its alternatives →

10. 10
    MockingBot▲82

    A rapid prototyping, design collaboration and handoff tool

    2018 · its alternatives →

11. 11
    Signadot▲187

    Hi again HN, we’re Arjun and Anirudh, founders of Signadot (YC W20). Signadot helps teams developing microservices test their changes using lightweight environments called “Sandboxes”. We use a relatively new approach, using traffic labeling (using OpenTelemetry) and request routing (using a Service Mesh) to isolate environments in a shared Kubernetes cluster. Today, we’re launching a new feature to help developers with local testing of microservices during the iterative development process. When we initially launched in September last year…

    2022 · signadot.com · its alternatives →

12. 12
    MCP Playground▲160

    MCP Playground is a Postman-style tool for MCP — inspect servers, execute tools live, test your client, all from the browser. Four things in one place: 1. Free hosted MCP servers — four public test servers anyone can point their client at: Echo (connectivity), Auth (Bearer token flow), Error (error handling), Complex (multi-tool schemas).No sign-up, just use the URL. 2. Server inspector — paste any remote MCP server URL, see all its tools/resources/prompts, execute them live, inspect the full JSON-RPC log. HTTP, SSE, and WebSocket all supported. 3. Registry — 10,000+ servers…

    Nov 2025 · mcpplayground.io · its alternatives →

13. 13MO
    Mockit – Open-source app to create and configure HTTP mocked endpoints▲158

    2019 · mockit.netlify.com · its alternatives →

14. 14
    Mockingjay – Fake servers and consumer-driven contracts▲39

    Fake server, Consumer Driven Contracts and help with testing performance from one configuration file with zero system dependencies and no coding whatsoever - quii/mockingjay-server

    2015 · github.com · its alternatives →

15. 15
    Mockoon – mock REST APIs in seconds▲68

    Mockoon is the easiest and quickest way to run mock REST API servers. No remote deployment, no account required, free, open source and cross-platform.

    2017 · mockoon.com · its alternatives →

16. 16
    Mati▲184

    Legally verify users with a few lines of JS

    2018 · metamap.com · its alternatives →

17. 17
    MockAPI Dog▲122

    Instant mock REST & LLM APIs - free, no signup required

    Feb 2026 · mockapi.dog · its alternatives →

18. 18MM
    Mocksup, my mockup prototyping & review webapp▲95

    2010 · mocksup.com · its alternatives →

19. 19
    MockRTC – a mock peer and MitM proxy library for WebRTC▲30

    Powerful friendly WebRTC mock peer & proxy. Contribute to httptoolkit/mockrtc development by creating an account on GitHub.

    2022 · github.com · its alternatives →

20. 20
    Fake API for Devs▲8

    Free mock api generator for developers | instant test data

    Nov 2025 · fakeapifordevs.vercel.app · its alternatives →

21. 21
    Broker-less simulation and mocking for Kafka▲36

    Simple configuration and mocking of Kafka clients. Contribute to obsidiandynamics/jackdaw development by creating an account on GitHub.

    2019 · github.com · its alternatives →

22. 22
    Mockoon▲89

    Mock servers in seconds

    2017 · mockoon.com · its alternatives →

23. 23
    Prism▲79

    Accelerate API development with realistic mock servers

    2023 · stoplight.io · its alternatives →

24. 24
    Mocktail – Free, open-source mock API server with a built-in dashboard▲25

    Hi HN, I built the first version of Mocktail years ago. I recently came back to the project, and after a pretty substantial rebuild, v4 is now out. Mocktail is a free and open-source, self-hosted mock API server with a built-in dashboard and database, packaged as a single ~25 MB binary. You can run it locally or on your own infrastructure — no account or hosted service required. You can define endpoints and responses, generate realistic data per request, customize headers, status codes and latency, and inspect incoming requests in real time. With v4, I also added MCP support, so coding…

    Aug 2026 · getmocktail.com · its alternatives →

Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →