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 out of ordinary household noise, and gives you live warmer/colder evidence as you approach the source.

THE HOT-AND-COLD GAME, BETWEEN CHIRPS

The beep you are hunting only sounds once every 30-60 seconds, so an instant meter is not enough.

- Chirp Trail gives every new chirp a verdict: WARMER or COLDER than the last one, with the dB change and a trail of recent chirps

- True-peak measurement reads the whole chirp, not a single instant, so every dB level and frequency estimate is honest

- Live relative-dB warmth gauge and, on multi-microphone devices, a directional bearing arrow

FIND THE BAND

- Auto Discover scans 24 bands from 400 Hz to 6 kHz and ranks repeatable, tonal candidates

- 15 curated presets cover alarms, appliances, leak sensors, UPS units, smart devices, and more, plus your own custom presets

- A live spectrogram shows where tonal energy is building; freeze it to inspect a beep you missed

HEARING ASSIST

Cannot hear high-pitched beeps? Your phone can.

- Screen flash and torch blink the instant a chirp is heard

- Spoken guidance tells you warmer or colder as you move

- With headphones on, a low-pitched tone you CAN hear tracks the signal

NAME THE DEVICE

- Device Dossier identifies the likely source (for example, one chirp every ~40 s at 3.2 kHz, smoke-alarm low battery), shows its evidence and sources, and gives you the exact fix

- Tap-to-Mark: if a beep is too faint for the mic, tap when you hear it and ChirpHound still decodes the pattern and identifies the device

COMPARE ROOMS FAIRLY

- Arm a room and let the next detected chirp become its evidence

- Re-measuring a room replaces stale evidence instead of duplicating it

- Rank rooms by detected peak with a clear confidence margin

- Keep the screen awake through long chirp intervals

CLOSE THE HUNT

- Sonar Mode is a full-screen, one-handed display for when you are up a step-stool

- Tap Found It to save the hunt with the device, the room, and how long it took

- 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 pattern is treated as possible smoke or fire; a four-beep pattern 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 stay in the app 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.