Features

By what you want to do. Everything here is in the free version too, unless it says Full.

Hear what is on the air

• The whole band at once. A tuning is split into every channel it holds, hundreds of them, each with the right width and mode for the band. Each channel is measured against the band's own noise floor, so one squelch works everywhere.
• The chart. A bar per channel: heard now, locked out, muted, saved, set aside. Inside each bar, the spectrum of that channel. Under the chart, a waterfall of the band.
• Open channels. A transmission opens its channel while it lasts, with its signal strength, its tone or code, and the words as they come. Hold a channel to stay on it. Let it go to carry on.
• Speech only. Play what has a voice in it. Skip steady carriers and data bursts. A channel that keeps opening for nothing is set aside for a while, and you see why.
• Morse. Morse code is recognised on every mode and written out live.
• AM, NFM, WFM, USB and LSB, with CTCSS and DCS tones decoded.

Name and keep channels

• Name a channel while it is open. The name follows it everywhere.
• Lock out for good, or until the next start. Mute it and still see it.
• Saved channels with tags. A starter set for your region: airband, marine, amateur bands, PMR446/FRS/GMRS.
• Profiles: every setting under a name, swapped with one click.
• SDR# import of frequency lists.

Record and read back

• The record button keeps every transmission as a small Opus file, sorted by day and channel. The folder has a limit you set.
• Heard recently and the conversation view: what was heard today, playable from the list.
• Full: speech to text, on your own computer. Nothing is sent anywhere. The words come a few seconds after each transmission.
• Full: the activity log as a CSV file, for a spreadsheet.
• Full: IQ recording of a held channel's whole tuning, and playing an IQ file back as a receiver.

Several receivers

• Full: as many dongles as you have, sharing the bands between them. The band is covered that many times faster. Or one receiver holds a channel while the others keep scanning.
• Full: audio for other programs on the same computer: decoders, recorders.

Looks after itself

• Gain. The app rides it, and backs off when a strong signal overloads the dongle.
• Receivers. The app finds what is plugged in and starts rtl_tcp for a dongle when you say so. When something is missing, it says in plain words what is wrong and what to do.
• Privacy. Everything stays on your computer. No account, no statistics, no network connection of the app's own, except a weekly look at the list of refunded licences, which carries nothing about you. A problem report goes to the developer only when you press Send, after you have read it. Privacy.
• Updates on request only, from the app itself.