Keep a record of sound, time and place.
Help & Support
Updated October 15, 2026
Start and save
Tap 开始测量 (Start measurement) and allow microphone access. Location permission is optional. Observe the reading and curve, then tap 结束并保存 (Finish and save). Records include minimum, energy mean, maximum, timestamps and duration.
Audio and export
Enable 保留原声 (Preserve Audio) in settings before starting a new session if you want to retain audio. It is OFF by default. Record details support notes and export through the native share sheet with an image, CSV, JSON, checksum manifest and optional audio.
Delete and manage permissions
Open the history list and swipe a record to delete it and retained audio. Manage microphone and location permissions in iOS Settings. Removing the app removes local records, but does not withdraw files already sent or saved elsewhere.
Measurement limitations
Levels are unweighted estimates from microphone dBFS plus a calibration offset, not certified A-weighted dB(A). You can adjust the offset against a calibrated sound level meter. The app does not replace professional measurement or third-party assessment. Device time, location and SHA-256 checks do not provide a trusted timestamp or tamper-proof certification.
Automatic session ending
Backgrounding, audio interruptions, input-device changes or the one-hour session limit finish and save a session. Use the app in the foreground; overnight background monitoring is not supported. Denying location does not prevent level measurement.
Contact support
Email 510245979@qq.com with your device model, iOS version, app version and issue. You may attach a screenshot you are comfortable sharing. No password, payment details or private recording is needed.