RF Signal Detector vs Bandline

Protect your peace of mind with ReFi. A secure, offline tool to find hidden devices and cameras. Are You Truly Alone? Hidden spy cameras, rogue microphones, and trackers are smaller and easier to hide than ever before. Whether you are in a hotel, an Airbnb, or a sensitive meeting, your privacy matters. Meet ReFi, your essential rf signal detector designed to help you scan your surroundings, locate suspicious electronic emissions, and secure your personal space. Why Choose ReFi? Most security apps require intrusive permissions or upload your data. Not us. Our usp is a privacy first rf detector. We believe a tool built to protect you should never track you. 100% Offline Processing: All scans happen entirely on your device. Zero Account Required: No registration, no emails, no tracking. No Data Sharing: We never collect, sell, or share your metrics. Key Features Smart RF Detector: Detect electromagnetic fields emitted by hidden electronic devices, lenses, and spy bugs. Network Scanner: Identify unauthorized devices connected to local Wi-Fi or Bluetooth networks. Real-Time Visualizer: Easy-to-read signal strength charts spike as you get closer to a threat. Haptic & Audio Alerts: Receive instant sound and vibration feedback to help you sweep a room discreetly. Perfect For: Travelers: Sweep vacation rentals and hotel rooms. Professionals: Secure conference rooms before sensitive discussions. Privacy Enthusiasts: Add an extra layer of daily defense against surveillance. Disclaimer: ReFi uses your phone’s built-in magnetometer and wireless sensors to locate potential threats. While highly effective as a first line of defense, standard smartphones cannot detect all dormant or military-grade signals. Download ReFi today—secure your space and keep your personal life private. Terms(EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy policy:https://nulladevs.com/app-privacy-policy/

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.