Native RF analysis for macOS

Capture, analyze, and decode radio signals in one app.

Work from a live SDR or an IQ recording. Investigate unfamiliar signals, inspect their bits, and decode supported protocols in Sigil’s native Mac workspace.

Request beta access See the workflow

macOS 14 or later. Currently an invitation-only beta.

A generated 2-FSK recording in Sigil. Two peaks appear in the spectrum above a waterfall showing the changing tones. Both plots are visible together in the standard stacked layout. — Generated 2-FSK sample in Sigil: the spectrum shows the two tones, with their changes over time in the waterfall below. 200 baud, ±4 kHz deviation; no radio hardware required.
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The analysis workflow

From a selected signal
to structured output.

Move from the spectrum to a closer look at the waveform, bits, and decoded output in the same workspace.

Know the protocol?

Select the signal and run its decoder. Inspect the results and export the output your decoder provides.

Explore the decoders

Investigating something unfamiliar?

Examine modulation, recover a bitstream, and work out the frame structure. Adjust the analysis as you learn more.

Explore the workbenches

01 / Capture and select

Find the signal worth a closer look.

Explore a live receiver or open a recording. Select a signal in the spectrum and waterfall to focus your analysis.

Working with a selection

The selected 40 kHz channel around a generated OOK sensor signal, with two transmissions visible in the waterfall. — A generated sensor recording. The selected channel is centered at 433.9525 MHz; both transmissions remain visible.
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02 / Demodulate

Inspect the waveform. Recover the bits.

Investigate the modulation and symbol rate in the demodulation workbench. Adjust the settings and pass the recovered stream to Bits.

Analysis and decoding

The OOK demodulation waveform with a measured rate of 4032 chips per second. — The first burst, with OOK selected manually. Sigil estimates about 4,032 chips per second and recovers 1,159 chips for the Bits workbench.
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03 / Frame and interpret

Turn repeated bits into fields.

Compare frames, annotate fields, and investigate checksums. Give the recovered data a structure you can inspect. Save the interpretation as a protocol map and reuse it on matching bitstreams.

Annotated sensor fields: sync, sensor ID, counter, temperature, battery, and CRC. — Manchester decoding reveals eight 72-bit frames. Field names and temperature scaling were entered using the generated sample’s known layout.
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04 / Validate and export

Take the result into your next task.

Check the interpreted fields in a frame table and export them as CSV. For known protocols, run the corresponding decoder and export the output it provides.

Check output formats

Sensor frame table showing temperatures 23.4 through 23.9 degrees Celsius and passing CRC checks for all eight rows. — All eight frames pass CRC-8/SMBUS over the selected payload fields. The exported CSV matches the sample’s counters and temperatures.
Full app screenshot

Check your setup

Work from recordings
or a live receiver.

You need an SDR for live reception. You can analyze a recording without connecting any radio hardware.

Compatibility and specifications

Mac: macOS 14 or later.
Recordings: SigMF, WAV, and raw IQ, with additional formats listed in the specifications.
Receivers: Drivers for RTL-SDR, HackRF, USRP, and more. Required libraries and device-specific details are on the Compatibility page.

Start from a recording

Your first result.
No radio needed.

Load the built-in sample and run the CW decoder to read “WELCOME TO SIGIL.” You can also open your own IQ recording and explore it in the same workspace.

Read the getting-started guide

Command-line tools

Keep going at the command line.

Analyze recordings and use structured output in your own scripts. The bundled CLI extends the workflow beyond the app window.

CLI documentation Automation API

Analyze a recording as JSON

sigil analyze recording.sigmf --json

Replace recording.sigmf with your own file.

One planned edition

The complete workflow.
A one-time purchase.

Planned: $39.99 USD one-time purchase.
Full 30-day trial at launch.

Sigil is currently in beta. The public trial and checkout are not available yet.

Pricing and availability

Available by invitation

Bring your next signal to Sigil.

Tell us about your Mac, your SDR or recording format, and what you’d like to investigate.

Request beta access

Access is by invitation, with a named, expiring evaluation key. The public trial and checkout are not available yet.

Email a beta request

Opens your email app. You can also write directly to
support@sigil.radio

A request does not enroll you automatically. Participation is under the beta agreement.