Find Open-Source Alternatives
Discover powerful open-source replacements for popular commercial software. Save on costs, gain transparency, and join a community of developers.
Discover powerful open-source replacements for popular commercial software. Save on costs, gain transparency, and join a community of developers.
Compare community-driven replacements for Testfully in api clients & testing workflows. We curate active, self-hostable options with transparent licensing so you can evaluate the right fit quickly.
Run on infrastructure you control
Recent commits in the last 6 months
MIT, Apache, and similar licenses
Counts reflect projects currently indexed as alternatives to Testfully.
These projects match the most common migration paths for teams replacing Testfully.
Why teams pick it
Active roadmap with CLI, self-hosting, and AI features planned
Why teams pick it
Self-hosted with multi-user authentication and permission management
Beautiful cross-platform API client with multimedia response preview
Why teams choose it
Watch for
WebSocket, MQTT, and gRPC support still in development
Migration highlight
Testing Image Processing APIs
Directly preview generated images, thumbnails, and visual transformations without downloading files or switching tools
Run and test HTTP requests from a single fast CLI
Instant, offline‑first OpenAPI client with modern interactive docs
Why teams choose it
Developer-first multi-protocol API platform with VSCode-inspired experience
Self-hosted, collaborative API development environment with multi-user support
Cross-platform API client for REST, GraphQL, gRPC, and more
Offline-First HTTP & Socket Testing Client for Web & Desktop
Native graphical HTTP client for testing APIs freely
HTTP testing tool with HTTP/2, HTTP/3, and WebSocket support
Local‑first API client that stores collections as plain files
Human-friendly command-line HTTP client for the API era
Curlie: curl’s power with httpie’s friendly syntax
Local-first API client, interceptor, and mocking platform.
Fast, privacy-first desktop API client for modern protocols
In-browser, text-driven HTTP client for rapid API testing.
Lightweight API development ecosystem for testing and collaboration
Terminal-based API client for free, offline HTTP testing
Teams replacing Testfully in api clients & testing workflows typically weigh self-hosting needs, integration coverage, and licensing obligations.
Tip: shortlist one hosted and one self-hosted option so stakeholders can compare trade-offs before migrating away from Testfully.
Why teams choose it
Watch for
No graphical interface for interactive debugging
Migration highlight
CI pipeline validation
Run .hurl files during builds to ensure API endpoints return expected status codes and payloads, failing the pipeline on mismatches.
Why teams choose it
Watch for
Requires a valid OpenAPI/Swagger document
Migration highlight
Generate live API docs from a FastAPI project
Developers push changes; Scalar’s watch mode updates the reference instantly, keeping docs in sync with code.
Watch for
Beta software with potential breaking changes before v1 release
Migration highlight
Microservices Development Testing
Developers test gRPC endpoints locally with saved collections, rapidly iterating on service contracts and streaming implementations.
Why teams choose it
Watch for
AGPL-3.0 license may require legal review for commercial use
Migration highlight
Real-Time Chat API Development
Debug WebSocket and Socket.IO events visually, monitor emitters and listeners, and collaborate on event-driven API collections across frontend and backend teams.
Why teams choose it
Watch for
Browser extension required for CORS proxy functionality adds setup complexity
Migration highlight
Secure Internal API Testing
Development teams store production API keys and test sensitive endpoints without exposing credentials to third-party cloud services
Why teams choose it
Watch for
Account required for most features beyond basic Scratch Pad mode
Migration highlight
Multi-Protocol API Development
Debug REST endpoints, test GraphQL mutations, and validate gRPC services in one unified client without switching tools.
Why teams choose it
Watch for
Fewer enterprise features compared to established tools like Postman
Migration highlight
Local Development Testing
Test APIs during development without internet dependency, maintaining full functionality on flights or in offline environments
Why teams choose it
Watch for
Requires GNOME SDK 46+ dependencies, which may be heavy on non-GNOME systems
Migration highlight
Version-Controlled API Development
Store request collections in Git alongside code, enabling team collaboration and historical tracking of API endpoint changes without external services.
Why teams choose it
Watch for
HTTP/3 support limited to Linux and Windows 11 or later
Migration highlight
HTTP/3 API Development
Test and validate next-generation HTTP/3 endpoints with native protocol support, ensuring compatibility before production deployment
Why teams choose it
Watch for
No built‑in cloud sync or shared workspace
Migration highlight
Version‑controlled API collection management
Teams can track, branch, and merge API request files using Git, providing auditability and rollback.
Why teams choose it
Watch for
Python dependency may add overhead in minimal environments
Migration highlight
API endpoint testing during development
Quickly validate request/response behavior with readable syntax and formatted JSON output for faster debugging cycles
Why teams choose it
Watch for
Learning curve for mixed curl and httpie syntax
Migration highlight
Quick API GET request
Retrieve and view JSON responses with automatic pretty‑printing, reducing manual parsing.
Why teams choose it
Watch for
No active open‑source contribution workflow currently.
Migration highlight
Rapid Frontend Development
Mock backend endpoints locally, allowing UI work to continue while APIs are under construction.
Why teams choose it
Watch for
Contribution policy limited to bug fixes; feature contributions not accepted
Migration highlight
Microservices Testing with Git Workflows
Mirror API collections to a Git repository, enabling code review for request changes and version-controlled environment configurations across dev, staging, and production.
Why teams choose it
Watch for
Relies on a backend proxy; cannot bypass CORS without self‑hosting.
Migration highlight
Validate webhook payloads
Send sample POST requests with file uploads and view the exact response chain to ensure webhook handling works.
Why teams choose it
Watch for
SSO and advanced enterprise features require paid edition
Migration highlight
GraphQL Schema Exploration
Set endpoint, retrieve schema with multi-column docs, and query with custom headers in a single interface
Why teams choose it
Watch for
Terminal-only interface may have a learning curve for users accustomed to GUI clients
Migration highlight
Remote server API debugging
SSH into production servers and test internal APIs directly without installing heavy GUI tools or exposing endpoints externally.