Native RF analysis for macOS

From live spectrum to decoded bits.

Sigil puts a live spectrum and waterfall on your SDR, cuts any burst straight to an IQ recording, and takes it apart: symbols, bits, decoded messages. It's a true Mac app, SwiftUI and Metal front to back, and just as at home with a recording as with live air.

Coming soon beta invites go out first

macOS 14 or later · Apple Silicon & Intel

HackRF One 433.920 MHz · 10 MS/s LiveAnalysis

Decoder Symbols Bits TPMS · 2 sensors

14:32:07.412	1C6F02A4	Schrader-EG53MA4	temp=21°C pressure=32.5PSI
14:32:09.876	0F58C11D	Toyota	temp=24°C pressure=35.1PSI
14:32:11.204	1C6F02A4	Schrader-EG53MA4	temp=21°C pressure=32.4PSI

Works with

RTL-SDR
HackRF One
USRP UHD
SignalHound BB60
HydraSDR RFOne
SoapySDR any device

Each device's free library loads at runtime — a one-line Homebrew install. Opening recordings needs no drivers at all.

Inside the instrument

Anything you can see, you can capture

Live spectrum and waterfall render on Metal at your display's refresh rate, while a rolling buffer holds the raw IQ behind everything on screen. Shift-drag a box around a burst as it scrolls past and Sigil cuts that slice out as a SigMF recording, straight into analysis. A click-to-tune VFO plays live audio: NBFM, WFM, AM, USB/LSB.

60–120 fps Metal spectrum + waterfall, vsync-paced
Rolling IQ buffer sized to your Mac's memory
Jump into analysis without stopping the SDR

Box-select a burst to cut a SigMF capture

Make sense of an unknown burst

Point the symbol analyzer at a burst you can't identify and it recovers the carrier, the baud, and the constellation — blind. The lock chip is honest: you get QPSK · EVM 4.2% only when there's a real symbol lock, never a decorated guess. Eye diagrams, channel measurements, and a modulation classifier that names what it sees: CW, CSS, FM, M-FSK, PSK, OOK, FSK.

Blind carrier / baud / constellation recovery
Eye diagram with strobe-aligned traces
Band power, occupied bandwidth, channel SNR

Constellation SYM 9600 · QPSK · EVM 4.2%

Eye · I

Symbols tab — constellation and eye diagram

A workbench for raw bits

Decoded a frame nobody documents? Drag across the bit grid to carve fields, read each one as hex, decimal, binary, or ASCII, and let the checksum search work out which known CRC model connects the message to its check bytes. Reverse-engineering, minus the spreadsheet.

Drag-select field annotation over raw decoder bits
51-model verified CRC catalog
Checksum identification over any selection

Bits 96 bits · FSK burst

SYNC 0x2DD4 ADDR · 21 bits 0x15D2A9 PAYLOAD · 40 bits CRC-16/CCITT-FALSE ✓

Bit workbench — field carving and CRC identification

Decoders that show their work

When a decoder comes up empty it tells you why: which stage gave up, and what to try next. A silent capture is a clue, not a dead end.

Decoder	Modulation	What you get
CW	On-off keyed Morse	Text with adaptive WPM tracking
OOK	Pulse trains	Bits, Manchester decode, protocol matching
FSK	2-level FSK	NRZ bitstream with symbol-center clock recovery
POCSAG	FSK · 512–2400 Bd	Pager messages — address, function, alpha/numeric
FLEX	2/4-level FSK · 1600/3200 Bd	BCH-checked pager frames, full field table
TPMS	OOK / FSK bursts	Tire sensor ID, pressure, temperature
LRS	FSK paging	Restaurant pager transmissions

Unknown signal? analyze gives you a modulation verdict first, then you pick the decoder.

The engine ships as a CLI, too

The same DSP core behind the app — pure Swift and Accelerate — drives the command-line tools: decode recordings in batch, generate synthetic IQ for testing, or run captures headless.

zsh — sigil

$ decode drive.sigmf -d tpms
  [structured] Schrader-EG53MA4 id=1C6F02A4 temp=21°C pressure=32.5PSI
$ generate psk random:2000 --order 4 --symbol-rate 9600 -o qpsk.sigmf
$ capture --device hackrf -c 433.92e6 -s 10e6 -o band.sigmf

Reads

SigMF
fc32 / cf32
cs16 / sc16
cu8
cs8
WAV
BLUE .cdif / .blue
SDVR
raw

Coming soon.

Sigil for macOS

1.0 in development

Every decoder and SDR driver included
The full analysis suite: symbols, bits, measurements, classifier
One-time purchase — no subscription

Pricing announced at launch. Secure checkout through Paddle, VAT handled.

Beta program

Beta opening soon

Full app, no feature gates
Signed, notarized builds with auto-update
Open a SigMF recording — no hardware needed

Ask for an invite

macOS 14 Sonoma or later · universal binary (Apple Silicon & Intel)