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Soundmark is an offline field-recording notebook: record a sound from the world around you, trim it, name it, note where you were, and the app analyses its waveform and spectrum on the device. No accounts, no servers — which means your recordings stay with you, and we can't see anything from here.
Write to us
Include what happened, your iPhone model and your iOS version — it saves us a round trip.
support@ozlab.xyzWe usually reply within one or two working days.
Frequently asked
How do I record a sound?
Tap the green button at the bottom of the library to open the recorder, then tap once more to start. iOS asks for microphone permission the first time. Tap again to stop — you go straight to trimming.
How do I trim a recording?
Trimming opens automatically when you stop recording: drag the handles at each end of the waveform over the part worth keeping, then save to the library. Existing recordings can be re-trimmed too — the edit icon at the top right of a recording's page has an “AUDIO” block that opens the trimmer. Trimming re-runs the analysis and updates the duration and the colour.
How do I attach photos or video?
Edit icon at the top right → the “MEDIA” section → tap the last tile to open the system picker; photos and videos, multi-select. The app only ever receives the specific items you pick — iOS runs that picker outside the app, so Soundmark never gets access to your photo library. Whatever you pick is copied into the app's own storage.
What do the analysis metrics mean?
Dominant frequency is the strongest frequency in the recording (Hz) — roughly the pitch you hear. Loudness is the overall RMS level in dBFS (negative; closer to zero is louder). Spectral centroid is the centre of mass of the spectrum (Hz) — higher sounds brighter, thinner. Zero-crossing rate counts how often the waveform crosses zero: high for hiss and noise, low for a deep hum. The spectrogram is the spectrum over time (STFT), and the series view draws the five strongest frequency components as sine curves.
Where are my recordings stored?
In the app's own Documents directory: audio in Recordings/, attachments in Media/, and a library.json index. Only Soundmark can read those files, and they are not synced anywhere.
How do I get recordings off the phone?
Connect the iPhone to a computer and open Finder (macOS) or iTunes (Windows) → your device → Files → Soundmark, then drag the Recordings folder out. You can also reach it on the phone through the Files app under “On My iPhone”. The audio is linear PCM in a CAF container, which virtually every audio tool can open.
Why is there no cloud sync?
Because no sync means no servers; no servers means no accounts, no data processing to disclose, and nothing to leak. There is not a single network request in the entire codebase. The cost is that moving to a new phone means moving the files yourself, as above — we think that's a good trade.
How do I delete my data?
Long-press any recording in the library → Delete, confirm, and its audio and attachments are removed from disk permanently. To erase everything, delete the app: all of its data lives in its own container and iOS removes it along with the app. There is no copy on our side to delete, because we never had one.