ChirpHound

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.