Whitespace.
See who already built your idea — and the space they left open.

CLUSTER MOCK-API-ENDPOINTS · 21 ENTRIES · EARLIEST ENTRY 2025-11-06

API testing and management tools

This cluster comprises web-based and desktop tools for building, testing, and managing HTTP and WebSocket APIs, including request builders, collection organizers, environment managers, and prompt-engineering workspaces. Dated entries before the index start show an initial grouping from November 2025 through January 2026, followed by a single entry in July 2026. PostmanLite leads traction with 11 stars, ahead of OpenBox and ericaqa-api-runner.

Entry timeline

ENTRY TIMELINE

NOV 2025: 3DEC 2025: 2JAN 2026: 1JUL 2026: 1AUG 2026: 8SEP 2026: 5OCT 2026: 1
NOV 2025OCT 2026

Each bar is the month a member carries, which is a creation date where the source published one and a crawl date otherwise. Nothing in the index was found before 11 August 2026, and coverage broadened sharply on 14–15 August, so a bar from then on reports how much we found that month, not how much was built; an earlier bar reports how far back a member's own source dated it — not how long we have been watching.

Members by activity

Activity signals, not revenue.

Build origin · 2 ai-built · 18 unlabelled

Operator · 10 hobby · 1 commercial · 1 open source · 8 unlabelled

Two labels per entry, never collapsed into one: how it was built, and who stands behind it. Counted over the 20 listed below. Unlabelled means nothing has decided yet — not that the answer is small.

  1. 01OpenBox2★2 moliveopen sourceCommunity-driven open-source web app that aggregates, verifies, and rates free APIs, proxies, servers, and other resources.
  2. 02PostmanLite12★1 moliveWeb app that automates API testing by running saved request collections and reporting results.
  3. 03sms0★24 daysliveWeb tool for testing HTTP endpoints against an allowed-host list and managing saved endpoints through an admin page.
  4. 04adr4agents0★10 days—hobbyWeb app that documents architecture decisions, stores projects, decisions, tags, and comments, and exposes them through an API.
  5. 05api-client-web0★18 days—hobbyWeb app that sends HTTP requests with query parameters, headers, authentication, request bodies, test scripts, history, collections, and environment variables.
  6. 06promptforge0★13 days—hobbyWeb app that lets prompt engineers version prompts, fill named variables, and compare test cases against mock model responses, all stored locally.
  7. 07Devapishub3★2 molivehobbyWeb platform that curates and documents free public APIs so developers can browse, copy, and test endpoints.
  8. 08PlayGen1★1 mo—Web platform that captures browser network traffic and generates API test cases with scheduling and execution.
  9. 09hermes0★1 mo—Web application that lets developers build, test, and organize HTTP API requests as a self-hosted alternative to commercial API clients.
  10. 10api-doctor0★1 molivehobbyWeb app that lets developers send HTTP requests, configure authentication, inspect responses, and manage request history from the browser.
  11. 11octavia-laravel0★1 mo—Web platform that benchmarks, evolves, and version-tracks prompts through automated testing and mutation, with a marketplace for sharing them.
  12. 12ApexCall1★9 mostalelivehobbyA web-based API testing tool for building requests, saving history and collections, and managing environment variables.
  13. 13Api-testing-tool0★5 mo—hobbyWeb application for testing HTTP APIs with custom headers, parameters, and bodies, supporting saved collections, environments, and request history.
  14. 14apify1★11 mostaleliveai-builthobbyWeb platform that lets users test and explore APIs from any website, manage API keys, track request history, and view documentation.
  15. 15EdgeMan0★10 mostalelivehobbyWeb platform where developers create, organize, and run API requests with saved collections, environments, and request history.
  16. 16EdgeMan-b0★10 mostale—hobbyWeb platform that lets developers test APIs, save request collections, and manage environment variables and request history.
  17. 17TypeSpec Playground0★unknownliveWeb playground for editing and testing TypeSpec API definitions.
  18. 1840 Free APIs for Developers — No Credit Card, Instant Access | Clawdia0★unknownlivecommercialDirectory platform giving developers free access to dozens of REST APIs covering geolocation, crypto prices, web scraping, DNS lookup, and document generation.
  19. 19API Configurator0★unknownliveai-builtWeb tool that lets users configure and manage API endpoints and integration settings for their applications.
  20. 20ReAPI Client0★unknownliveAPI testing web app with request history, repeat request from history, code snippet generation, and light/dark theme.

Ranked by traction, highest first, and paged 20 at a time — this is a window on the cluster, never the whole of it. Ties are broken by a stable id so a product cannot appear on two pages or fall between them. Browse every cluster.