About Bowire

One API workbench for every protocol your .NET services speak.

Why Bowire exists

Modern .NET services rarely speak just one protocol. A typical backend mixes gRPC for internal service-to-service calls, REST for a public API, SignalR for real-time UI, maybe MQTT for IoT, and increasingly MCP for AI agents. Each protocol historically comes with its own testing tool — each with its own quirks, its own UI, its own mental model.

Bowire is the single workbench that covers all of them. Embed it in your ASP.NET service with one line, or run it standalone against any URL — same UI, every protocol.

Built by Küstenlogik

Bowire is designed and maintained by Küstenlogik, a software studio based in Northern Germany. We build distributed-system tooling — Storm, Charter, Beacon, Estuary, and Bowire — for teams running production-grade .NET services, and back our products with commercial support and integration work. The kind of workloads where “pass the curl command to the intern” isn’t a viable testing strategy.

If you need help embedding Bowire in your stack, extending it with a custom protocol plugin, or want to talk through a specific integration challenge — reach out.

Open by default

Apache 2.0, developed publicly on GitHub. Every feature on the landing page is in the free tier, because there is no other tier. Fork it, audit it, embed it in commercial products — no asterisks, no seat count, no account required.

This is deliberate. Local-first developer tools should stay that way — developer-owned, not hostage to a cloud sync service’s pricing page.

Get in touch

For bug reports, feature requests, pull requests, and general OSS contribution — join the crew. The issue tracker, PR queue, roadmap, and contributor guide are all linked from there.

For commercial support, custom protocol plugins, or integration help on your .NET stack — reach out to Küstenlogik directly.