ChirpHound: Smoke Alarm Finder

That periodic chirp is real. ChirpHound helps you work out which device and which room it is coming from, privately and offline. Start with Auto Discover or choose a frequency preset, then walk through the space. ChirpHound learns the local noise floor, isolates repeatable tonal energy, and gives you live warmer/colder evidence as you approach the source. NEW IN 4.1 — NEXT CHIRP CLOCK The beep you’re hunting only sounds once a minute. After two chirps, ChirpHound times this device’s rhythm. • Countdown to the next chirp, with WALK / FREEZE / NOW coaching • Freeze in the last few seconds so the measurement is honest • Listen window: slightly more sensitive only when the chirp is due • Adaptive lock onto the tone actually in the room, without narrowing the band FIND THE BAND • Auto Discover scans 24 bands from 400 Hz to 6 kHz • Repeatability and tonality ranking helps reject broad household noise • 15 curated presets cover alarms, appliances, leak sensors, UPS units, smart devices, and more • A live spectrogram shows where tonal energy is building COMPARE LOCATIONS FAIRLY • Arm a room and let the next detected chirp become its evidence • Re-measuring a room replaces stale evidence instead of creating duplicates • Rank rooms by detected peak with a clear confidence margin • Keep the screen awake while waiting through long chirp intervals PRACTICE AND SEARCH OFFLINE • Signal Lab includes 18 original synthetic scenes for timing, echoes, distance, fan masking, and common household sources • Hidden Source Checklist covers 43 places and device types people often miss • Chirp Field Guide includes 44 original visual plates with safety and technique references • Everything is bundled in the app and available without an account FIELD EVIDENCE • Live relative-dB warmth gauge and optional directional estimate • Adaptive calibration, active microphone route, format, and tonality diagnostics • Chirp log with timestamps, intervals, and burst grouping • Sweep Plan with evidence-based next steps • Local history, notes, CSV export, and PDF field reports SAFETY-FIRST PATTERN GUIDANCE ChirpHound recognizes repeated groups as well as periodic single chirps. A three-beep alarm pattern is treated as possible smoke or fire. A four-beep alarm pattern is treated as possible carbon monoxide. Maintenance codes vary by manufacturer and model, so the app asks you to verify the exact device manual instead of making a universal claim. BUILT FOR PRIVACY • Audio is analyzed live on this device. • Audio is not recorded or uploaded. • No account is required. • No advertising, analytics, tracking, or third-party SDKs. • Hunt and checklist data remain in the app container unless you explicitly export a report. ChirpHound is a locating and reference aid. It is not a smoke alarm, carbon-monoxide alarm, calibrated sound-level meter, or substitute for emergency action. If a real alarm is sounding, leave the area, follow its instructions, and contact emergency services from a safe location. NEW IN 4.2 - PERSONAL FIELD BASELINE After two hunts, Insights compares your five most recent completed hunts with the five before them. See whether signal yield and find rate are improving on this device, without uploading a recording or creating an account.