KlarFunk

KlarFunk — klar (clear) plus Funk (radio) — is German-engineered spectrum scanning and frequency coordination for wireless microphones and in-ear monitors. Plug in a supported USB device, press Space, and a few seconds later you see the UHF band as it really is in your room: what is occupied, what is free, and where your mics and IEMs should go.

KlarFunk is a desktop app for macOS and Windows. It runs entirely on your computer: no account, no cloud, and it works with the internet switched off. That matters on show networks — a Dante or console VLAN with no route to the internet is the normal case, and KlarFunk starts normally on one.

Who it is for

• Freelance FOH and monitor engineers walking into an unknown venue.
• RF techs on small and mid-size tours without a receiver-network rig.
• Festival stages, theatres and houses of worship sharing crowded spectrum.
• Rental companies prepping a kit with a coordination sheet in the case.

What makes it different

• Measured, not assumed. Planning tools coordinate against a database; KlarFunk coordinates against the room you are standing in.
• Three-state occupancy. Your own carriers (green), contention on your channel (amber) and unknown interference (red) — not a single threshold.
• Vendor-neutral, cheap hardware. An RTL-SDR stick at around €40 is the reference device; tinySA, RF Explorer, HackRF, Airspy and SDRplay all work.
• Dozens of device families and 8 regulatory regions — group/channel picks resolve to exact MHz and each device gets a licence verdict.
• Fully offline and private. No telemetry, no cloud; spectrum data never leaves your machine.
• Try it first. Every install runs a 14-day full-feature trial, and a free browser demo on the platform runs the real spectrum view on synthetic data.

Pages in this guide

• Getting started — download, install, first launch, first scan.
• Supported hardware — every supported device, what each one can and cannot do.
• Find a free frequency window — find a free window, use the waterfall, listen, compare scans.
• Register your equipment — register your gear, save lists, keep a history.
• Coordinate a show with the Frequency Advisor — coordinate a show and set your region.
• Export and import — CSV, JSON, Wireless Workbench, the A4 sheet.
• Licence, trial and your data — trial, activation, three computers, and where your data lives.
• FAQ — hardware, internet, accuracy, licensing.
• Troubleshooting — demo mode, Gatekeeper, SmartScreen, blank windows.