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Heard a signal you can't identify? Bandline narrows 520 known signals down to a handful — from what you can actually measure. Enter a frequency, hold your phone to the receiver, or match a waterfall shape by eye. Everything works offline, in the field, with no account and no connection. — THREE WAYS IN — BY FREQUENCY Type any frequency and see the full allocation stack: primary and secondary service, national applications, footnotes, licence class and power limits. Then see which known signals actually live in that band, ranked by how commonly they're heard. BY EAR (the interesting one) Hold your phone near the receiver's speaker, or plug in a line-in cable. Bandline records a short sample and measures: - occupied bandwidth (−26 dB) - autocorrelation peaks (ACF, in milliseconds) - tone count and tone spacing for MFSK - estimated symbol rate - burst length, duty cycle, on/off periodicity - modulation class (AM, FM, SSB, PSK, FSK, OFDM-like) Each measurement becomes a filter. The candidate list narrows as you go — 520, then 12, then 3. Drop a chip if a reading looks off. Every measurement shows a confidence indicator, because measuring through a phone mic is honest work but not laboratory work. BY SHAPE Browse a visual grid of reference waterfalls, filtered by band and category. You already know what CODAR and STANAG look like — this is faster than reading a list. — SIGNAL CARDS — Name and aliases, category, active status, frequency ranges, modulation, bandwidth, ACF, symbol rate and mode. A reference waterfall you can pinch-zoom and compare side by side with your own capture on a matched frequency axis. A playable audio sample with a live spectrogram. Protocol notes and links to specifications and decoder software. — ALLOCATIONS — Switzerland, Germany, France, the UK and the USA at launch, from official national tables and the European ECA/EFIS data. IARU amateur band plans included. Auto-detects your region, or set it manually. — BUILT FOR FIELD USE — Fully offline once your library is downloaded. Dark theme with an optional red night mode. Monospace numerics throughout. Density over whitespace — the numbers stay on screen. — WHAT THIS ISN'T — Bandline is an instrument and a reference, not a receiver. It does not connect to SDR hardware; it works alongside whatever radio you already own. It identifies signal types, never message content. No decryption, no descrambling, no guidance on intercepting protected communications — by design, permanently. — PRO — One-time purchase, no subscription, ever. Removes ads, unlocks all offline packs, plus unlimited saved captures, waterfall export and a private custom signal library. Signal reference informed by the community work at sigidwiki.com. Corrections welcome from every card.