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>log in to commentI built Zorvik as a free, open‑source desktop workbench that lets you build, test, mock and load‑test APIs across HTTP, GraphQL, gRPC, WebSocket, MQTT, TCP, UDP, DNS and more, all locally on Windows, macOS or Linux. It’s a single app instead of juggling multiple tools. I’d love to hear your thoughts!
Zorvik is a free, open-source desktop app to build, test, mock and load-test APIs across many protocols locally.
- for
- Developers and QA engineers needing offline, multi-protocol API tooling
- pricing
- free
- license
- Apache-2.0
Key features
- Multi-protocol support — Handles HTTP/1-3, GraphQL, gRPC, WebSocket, Socket.IO, SSE, MQTT, TCP, UDP and DNS in one app.
- Mock server & routes — Create mock endpoints with params, delays, faults, CORS and forwarding.
- Load testing — Run virtual-user or arrival-rate load tests with configurable thresholds.
- MCP testing for AI agents — Test and mock MCP servers that AI agents use, with schema validation.
- Plain-file workspaces — All requests and configs are stored as readable YAML files in Git-friendly folders.
- CLI for CI/CD — Command-line tools (zorvik run, load, serve, mcp) integrate with pipelines and generate JUnit reports.
- Network inspector tools — Built-in TLS inspector, DNS lookup, port check, ping and encoders for Base64, JWT, hashes.
- Built-in learning bootcamp — Interactive lessons and labs teach API concepts and testing within the app.
Use cases
- Mock third-party APIs locally for integration testing
- Run load tests on a development machine before staging
- Validate MCP tool responses for AI agents in CI pipelines
- Create version-controlled API collections stored as YAML
- Teach new team members API testing with the built-in bootcamp
Zorvik vs alternatives
 Zorvik |  Bruno |  Insomnia |  Postman | |
|---|---|---|---|---|
| Best for | All-in-one offline API workbench | Offline-first API client | Open-source API client | API platform with collaboration |
| Pricing | Free | Free | Free | Subscription |
| DevHunt upvotes | 1 | 0 | 0 | 0 |
| Launched | Oct 2026 | — | — | — |
- Zorvik vs Bruno: Bruno is also offline-first and Git-friendly but focuses on a single protocol per workspace, whereas Zorvik unifies many protocols in one app.
- Zorvik vs Insomnia: Insomnia supports REST, GraphQL and gRPC with a GUI, but lacks the built-in load testing and MCP features of Zorvik.
- Zorvik vs Postman: Postman offers cloud sync, collaboration and a paid tier; Zorvik is fully local, free and open source with broader protocol coverage.
Zorvik FAQ
Do I need an account or internet connection to use Zorvik?+
No. Zorvik is local-first, works offline, and does not require any sign-in or cloud sync.
Is Zorvik open source?+
Yes, it is released under MIT or Apache-2.0 licenses by the LibreGuild community.
Can I run Zorvik in CI pipelines?+
Yes, the CLI commands (zorvik run, load, serve, mcp) work on headless machines and can output JUnit or JSON reports.
How are my secrets stored?+
Secret values, cookies and tokens stay on your computer and are never written to shared files or sent elsewhere.
What file format does Zorvik use for collections?+
Requests and environments are stored as plain YAML files in a folder you own, making them Git-compatible.
Does Zorvik support testing AI agent tools?+
Yes, it includes MCP server support to test and mock the tools and schemas that AI agents consume.
Summarized by DevHunt from libreguild.github.io · Oct 2, 2026. Details may change; check the official site.
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