Effective date: November 11, 2026
Developer: Digital NEXUS (digitalnexus.studio)
Package: com.decisafe.nexus
DeciSafe is a workplace noise log. Everything you enter stays on your phone. Digital NEXUS does not collect, receive, sell or share any of your data. The app has no account, no ads, no analytics and nothing to buy.
The app keeps a log of work shifts: the worker name, worker or badge ID, workstation, hearing protection and its NRR that you type in, and for each shift the date, the measured time, the calculation method (OSHA or NIOSH formula), the estimated noise levels, noise dose and peak, and the calibration offset used. The app also saves your calibration offset and chosen method. This data is saved in the app's private storage on your device. The app never sends it to us or to anyone else. If you log shifts for other people, please tell them what you record.
The app measures sound with your phone's microphone. It asks for the microphone permission when you first tap Start microphone or Start measuring, and uses the microphone only while the meter is on. The sound is analysed on your phone in real time, in memory: only the resulting numbers (sound levels in dB, noise dose and peak) are shown and, for shifts you save, stored. No audio is recorded, saved or sent, and no audio leaves your phone. If you refuse the permission, the app cannot measure and tells you how to allow it in Android settings.
The app asks for no other permission that needs your approval: no camera, location, contacts or files. It declares standard Android audio-settings permission alongside microphone measurement access (no INTERNET or ACCESS_NETWORK_STATE permissions and no Google Play Billing library). While the dosimeter is measuring, the app keeps the screen on, because Android does not let apps use the microphone in the background; this needs no permission.
From the latest offline build, the app's features and bundled typography work completely offline with zero network requests and zero billing libraries. (Earlier builds loaded fonts from Google Fonts and included the billing library without selling anything.)
If you tap Export / Print Shift Report, Android's print screen opens with your shift report. You choose a printer, or Save as PDF and where to save the file. That only happens when you do it, and the print service you choose is covered by its own privacy policy.
Clearing the app's storage in Android's settings, or uninstalling the app, deletes all of its data from your phone. The current version has no button to delete a single shift. If Android backup is turned on for your phone, Android may keep a copy of the app's data in your own Google account backup, which you manage in your Google account. Because we hold no data about you, there is nothing for us to delete on our side; you can still write to us with any question.
The app is a work tool for adults and is not directed at children.
DeciSafe is an independent app by Digital NEXUS. It is not affiliated with, endorsed by or connected to the U.S. Occupational Safety and Health Administration (OSHA), the National Institute for Occupational Safety and Health (NIOSH) or any government agency. A phone is not a calibrated sound level meter or noise dosimeter, and the app's reports are not official records.
If this policy changes, the new version will be posted on this page with a new effective date.
Digital NEXUS, [email protected], digitalnexus.studio