Open-source Testfully alternatives

Hoppscotch is an open-source API development ecosystem for sending requests, inspecting responses and organizing API work. It is positioned as an alternative to Postman and Insomnia and runs in the browser, as a desktop app and from a command line interface, with offline, on-premises and cloud options.

The request builder supports the standard HTTP methods plus custom ones, and the toolset extends to GraphQL and WebSocket testing. You can generate code snippets for more than ten languages and frameworks, share requests through public URLs, and install the web app as a progressive web app for offline use. The interface is lightweight, with light, dark and black themes, a choice of accent colors and a distraction-free Zen mode.

Hoppscotch is MIT licensed and written mainly in TypeScript with Vue. Teams that need to keep API traffic and collections inside their own network can self-host it, while the hosted service at hoppscotch.io suits individuals who just want to start sending requests.

Bruno is an open-source API client and testing environment, described as a lightweight alternative to Postman and Insomnia. It supports REST, GraphQL, gRPC and WebSocket requests, and runs on macOS, Windows and Linux.

Its distinguishing idea is that collections live directly in a folder on your filesystem, saved in a plain text markup language called Bru. That means you can version and share API collections with Git or any version control system you already use. Bruno is offline only, and the maintainers state they have no plans to add cloud sync, because they believe your data should stay on your device. A CLI runs collections from the command line for automated testing and CI/CD, and a Docker option is also documented.

The core is MIT licensed, and the project offers paid versions that add further features for teams that want them. Bruno can be installed from the website or through Homebrew, Chocolatey, Scoop, Snap, Flatpak and Apt. It suits developers who prefer keeping API definitions next to their code.

Karate is an open-source tool that unifies API testing, mocks, performance testing and UI automation in one framework with a single readable syntax. Tests are written as feature files, so people who are not Java developers can read and write them, and the project is written in Java.

Its documentation highlights the match keyword for validating complete responses, headers and arrays, parallel execution of features, scenarios and example rows, reusable flows by calling one feature from another, and test doubles that stand up HTTP, gRPC and message-queue mocks from a feature file. Karate v2 adds virtual threads, a single-binary CLI, JavaScript debugging and soft assertions. There are extensions for VS Code and IntelliJ, plus Karate Agent and Karate Xplorer products.

Tests can be run through JUnit, the command line or CI/CD pipelines. Karate is licensed under MIT, and topics mention BDD, Cucumber, contract testing, load testing and WebDriver. It suits QA engineers and developers who want one tool for API-level and UI-level checks.

Step CI is an API quality assurance framework aimed at developers who need to test several different API styles within the same test workflow, rather than using separate tools for REST, GraphQL and other protocols. It is language-agnostic, letting workflows be configured in YAML, JSON or JavaScript.

It supports testing REST, GraphQL, gRPC, tRPC and SOAP APIs, can run self-hosted on a local network, locally, or inside a CI/CD pipeline, and integrates with other tooling such as GitHub Actions. The README specifically calls out migration guidance for users coming from Postman and Insomnia, and an online playground is available to try workflows without installing anything.

The CLI can be installed via Node.js or Homebrew, and by default collects anonymous usage data, including a unique user ID, OS name, Node version and which commands are run, which can be disabled with an environment variable. Step CI is written in TypeScript and released under the Mozilla Public License 2.0, with a separate paid support plan offering SLA-backed support, onboarding and prioritized feature requests on top of the free core.