10 Best Open Source Testfully Alternatives
A curated collection of the 10 best open source and self-hosted alternatives to Testfully in 2026.
Looking for a free, privacy-friendly, or self-hosted replacement for Testfully in 2026? The top open-source alternative is Hoppscotch — Open-source API development ecosystem.
Other highly rated open-source Testfully alternatives include Bruno, Insomnia and Yaak.
Open-source API development ecosystem
Hoppscotch is an open-source API development ecosystem designed to help developers create, test, and share APIs efficiently. Built by developers for developers, it combines speed, collaboration, and flexibility to streamline API workflows. - API Client: Send HTTP requests with support for methods, headers, parameters, and authentication. - Workspaces: Organize projects and collaborate with teams in real-time. - Collections & Folders: Structure and share API requests efficiently. - Environment Variables: Manage and reuse variables across requests. - Real-Time Collaboration: Work simultaneously with team members. - On-Prem Deployment: Self-host Hoppscotch for full data control. - Pre-Request Scripts: Modify headers, generate data, and authenticate requests dynamically. - Post-Request Tests: Write assertions to validate API responses. - History Tracking: Review and manage past API requests. - Audit Logs: Monitor workspace activities and user actions. - Single-Sign-On (SSO): Integrate with existing identity providers. - Admin Dashboard: Manage users, workspaces, and permissions. - Multi-Language Support: Use Hoppscotch in 30+ languages. Hoppscotch is open-source and can be self-hosted on your own infrastructure. It supports Docker deployments and provides comprehensive documentation for setup. The platform is built with modern web technologies and is compatible with all major browsers.
Git-native API client for REST, GraphQL, gRPC and WebSocket
Bruno is the Git-native API client for REST, GraphQL, gRPC and WebSocket. A local and open-source solution to Postman. Fast, developer-first, and no cloud syncing. - Git-Native Collections: Store API collections as plain-text YAML files in your Git repository for version control and collaboration. - Multi-Protocol Support: Works with REST, GraphQL, gRPC, and WebSocket APIs. - Local-First & Secure: No cloud sync, no account required, and no AI training on your data. - IDE Integration: Runs directly in your IDE (VS Code) and terminal. - Enterprise Ready: SOC 2 Type II compliant with SSO/SAML, SCIM, and secret manager integrations (Vault, AWS, Azure). - Open Standard: Built on OpenCollection, the open standard for API collections. - Cross-Platform: Available for Linux, macOS, and Windows. - VS Code Extension: Enhance your development workflow with Bruno's VS Code extension. Bruno is a self-hosted application that runs entirely on your local machine or within your enterprise's security perimeter. No cloud infrastructure is required. The application is open-source (MIT License) and can be deployed via: - Native installers for Linux, macOS, and Windows - VS Code extension - Docker container (community-supported) For enterprise deployments, Bruno integrates seamlessly with existing identity providers (IdP), secret managers, and network controls (VPN, proxy, firewalls).
Intuitive API client for REST, GraphQL, and gRPC. Debug, test, and collaborate on APIs with ease across platforms.
Intuitive API client for REST, GraphQL, and gRPC. Debug, test, and collaborate on APIs with ease across platforms.
Local-first API client for HTTP, GraphQL, gRPC, and more
Yaak is a local-first API client designed for developers who value privacy, simplicity, and flexibility. Unlike traditional API clients, Yaak works entirely offline with no account required, storing all data locally and offering plain-text Git sync for collaboration. - Multi-protocol support: Send HTTP, GraphQL, gRPC, WebSocket, and Server-Sent Events (SSE) requests from a single workspace. - Local-first architecture: All requests, history, and data remain on your device with no cloud dependency. - Git synchronization: Store API collections as plain-text files for seamless version control with Git or Dropbox. - Encrypted secrets: Securely manage API keys and sensitive data using ChaCha20-Poly1305 encryption with OS keychain integration. - Agent-friendly CLI: Full command-line interface for integrating with AI agents or automating workflows. - Dynamic request templating: Use variables, template functions, and request chaining for reusable configurations. - Advanced debugging: Debug redirects, cookies, payloads, headers, and more with detailed request inspection. - Multi-window support: Work on multiple projects simultaneously with independent windows. - Import/export flexibility: Easily migrate data from Postman, Insomnia, OpenAPI, Swagger, or cURL. - Rich authentication handling: Support for OAuth 1/2, AWS v4, JWT, Basic, Bearer, API keys, and custom authentication methods. - Zero telemetry: No analytics, tracking, or data collection—ensuring complete privacy. - Cross-platform availability: Native builds for macOS, Windows, and Linux. Yaak is a fully self-hosted desktop application built with Tauri, offering native performance and a lightweight footprint. The application is open-source (MIT licensed) and can be audited or self-built from the GitHub repository. No server infrastructure is required—everything runs locally on your machine.
Open-source API documentation & SDK platform
Scalar is a modern platform for building, documenting, and managing APIs with full developer experience in mind. It enables teams to generate beautiful, interactive API documentation, type-safe SDKs, and secure MCP servers directly from OpenAPI specifications. Scalar keeps all interfaces synchronized as APIs evolve, reducing manual maintenance and ensuring consistency. - OpenAPI & AsyncAPI Support: Generate documentation and SDKs from industry-standard API specifications. - Automated SDK Generation: Create type-safe client libraries in multiple languages (TypeScript, Python, Java, Go, Rust, etc.) with a single commit. - Interactive API Docs: Build beautiful, customizable documentation with Markdown, MDX, and embedded API references. - Two-Way Git Sync: Keep docs and code in perfect sync with automatic updates from your repository. - MCP Server Integration: Deploy secure Model Context Protocol servers for AI agent interactions. - Private & Public Portals: Control access with customizable visibility for internal teams or public audiences. - Custom Branding: Tailor HTML/CSS/JS to match your brand identity. - AI & MCP Chat: Enable AI-powered interactions with your API documentation. - Registry & CLI Tools: Manage APIs, SDKs, and documentation through a centralized registry and command-line interface. Scalar is primarily a cloud-based platform with a free tier available. The core components are open-source, allowing for self-hosting of documentation and registry services. The platform emphasizes open standards (OpenAPI, AsyncAPI) and provides tools for seamless CI/CD integration. For enterprise needs, Scalar offers managed services with advanced features and support.
Create mock REST APIs in seconds
Mockoon is the easiest and quickest way to design and run mock REST APIs. Whether you need a simple mock server for testing or a complex API with dynamic responses, Mockoon provides a powerful yet intuitive interface to get started in seconds. - Instant API Mocking: Create realistic mock REST APIs in seconds with an intuitive GUI - Cross-Platform: Available as a desktop application, CLI tool, and cloud service - Dynamic Templating: Generate dynamic responses using templating and rules-matching systems - OpenAPI Compatibility: Import and export OpenAPI specifications for seamless integration - Advanced Routing: Set up complex routing with proxy mode, webhooks, and TLS support - JSON Database: Store and retrieve data with built-in JSON database functionality - Chaos Engineering: Test edge cases and simulate real-world scenarios - No Remote Deployment Needed: Run mock servers locally without any cloud dependencies - CLI Support: Manage mock servers programmatically with the command-line interface - Integration Testing: Record HTTP requests and perform integration testing Mockoon is available as: - Desktop Application: Download for Windows, macOS, or Linux - CLI Tool: Install via npm or standalone binary - Cloud Service: Deploy mock APIs in the cloud with Mockoon Cloud The open-source core is self-hostable and can be deployed anywhere. The cloud service offers additional features and managed deployments. Download | Documentation | GitHub Repository
Git-native API client for teams to design, build and test APIs
Requestly is a Git-native API client designed for teams that ship at scale. It combines API design, testing, and automation in a single workspace with built-in enterprise security features. - Git-native Collections: Store API collections as local JSON files and sync with Git for version control. - Environments & Variables: Easily switch between dev, staging, and prod environments with dynamic variable support. - GraphQL & gRPC Support: Full support for GraphQL queries, mutations, and introspection, plus SOAP and gRPC streaming. - API Testing & Assertions: Run collections in order with the Collection Runner and validate responses using assertions. - AI Test Case Generator: Generate test cases from plain-English prompts for faster test creation. - Vault for Secrets: Encrypted secrets management with role-based access control (RBAC) and audit logs. - Team Workspaces: Collaborate with shared projects, synced across teams with SOC-2 compliance. - Requestly CLI: Execute collections in CI pipelines for automated testing. - Enterprise Security: SOC-2, SSO, RBAC, and audit logs for secure team collaboration. Requestly offers a cloud-hosted solution with enterprise-grade security. While the core product is cloud-based, teams can leverage local projects and Git integration for self-hosted workflows. The platform is compatible with Mac, Windows, and Linux, ensuring broad accessibility for development teams.
Human-friendly API testing client for developers
HTTPie is a modern, user-friendly API testing client designed to make working with HTTP servers, RESTful APIs, and web services effortless. Whether you prefer the command line or a sleek graphical interface, HTTPie provides a seamless experience for developers. - Intuitive CLI: Simple and readable syntax for HTTP requests, replacing complex curl commands - Cross-platform: Available as a terminal client, desktop app, and web interface - JSON Support: Built-in JSON handling with syntax highlighting and pretty-printing - Session Management: Save and reuse API requests with session support - Request History: Track and revisit previous API calls easily - Authentication: Supports various auth methods including OAuth, Basic Auth, and Bearer tokens - Extensible: Plugin system for adding custom functionality - Community-Driven: Open-source with active development and extensive documentation HTTPie is primarily a client-side tool with no server component required. The desktop and web versions are distributed as standalone applications. The open-source CLI is available via package managers (brew, apt, pip, etc.) and can be self-hosted by building from source. No backend infrastructure is needed for basic usage.
All-in-one platform for API testing, documentation, and collaboration, simplifying the entire API development lifecycle.
All-in-one platform for API testing, documentation, and collaboration, simplifying the entire API development lifecycle.
Offline Git-native API workspace
Voiden.md is an offline-first, Git-native API workspace that unifies API specs, documentation, tests, and mocks using programmable Markdown blocks. Built for developers who treat API work like code. - Git-Native Workflow: Store API specs, tests, and docs in .void files committed directly to your Git repository - Executable Markdown: Combine requests, documentation, and context in a single plain-text file that executes in place - Reusable Blocks: Decompose API requests into composable components (endpoints, headers, auth, params) for reuse across files - Offline-First: Works entirely locally with no cloud dependency, no accounts, and no telemetry - CI/CD Integration: Run API tests headlessly in pipelines using @voiden/runner with deterministic exit codes - No Vendor Lock-in: Pure Markdown format with Git as the storage layer, ensuring full portability - Cross-Platform: Available as a desktop app with plugins and a CLI runner for terminal environments - Developer-Friendly: Built by developers for developers who value version control, privacy, and ownership Voiden.md is open-source software that runs entirely on your local machine. The desktop application is available for Windows, macOS, and Linux, while the @voiden/runner CLI can be deployed in any Node.js environment including CI/CD pipelines. No server infrastructure is required as all data remains local to your device.
About Testfully
Testfully is a comprehensive API development platform that combines an API client, automated testing, and monitoring into a single tool. Designed for developers who need flexibility, it offers both cloud-based and offline storage options without compromising on privacy or functionality.
Key Features of Testfully
API Client
- Easy migration from Postman or Insomnia
- Flexible storage (cloud or local)
- Modern JavaScript scripting for custom requests
- Global, environment, and folder variables
- Robust request editor with customizable auth, parameters, and headers
- Team collaboration with role-based access control
- Support for OAuth2 and other authorization schemes
- Compatibility with RESTful, GraphQL, and XML APIs
API Testing
- No-code testing for quick validation
- Folder runner for batch execution
- Request chaining for realistic scenarios
- CLI for terminal integration and CI/CD pipelines
- Modern JavaScript scripting support
- Universal connectivity for local, protected, and public APIs
API Monitoring
- Health checks and functional testing
- Reuse existing requests for monitoring
- Secure whitelisting with IP addresses
- Multi-channel notifications (email, SMS, Slack, PagerDuty)
- Complete history for failure analysis
- Task grouping for organized monitoring setups
Tech / Self-Hosting
Testfully offers both cloud-based and offline versions, ensuring developers can work securely regardless of their connectivity requirements. The platform is SOC 2 Type 2, ISO 27001:2022, and HIPAA compliant, making it suitable for enterprises with strict security and privacy requirements.