App: Check It (by Tetracta) · Android · Effective date: 28 June 2026
Check It is developed by Tetracta. Contact: [email protected] · tetracta.ai.
Check It listens to a machine through your phone's microphone and motion sensor to help you notice when its sound or vibration changes over time. The core change-tracking engine and all on-device tools run locally on your device and provide hints, not a diagnosis. The app also includes Oney, an optional AI maintenance advisor (a paid PRO feature) that is online and described in Section 4.
For everything except the optional Oney AI feature, we do not collect, transmit, sell, or share any data. Specifically, the core:
When you enable Oney and use it, to generate an answer the app sends, over the internet:
Oney gives hints, not a certified diagnosis; safety and qualified experts always come first. It will decline anything unsafe or unlawful.
| Permission | Why | Leaves the device? |
|---|---|---|
| Microphone (record audio) | To listen to the machine's sound. Required for the core function. | No — analyzed/stored locally only. |
| Internet · Network state | Used only by the optional Oney AI advisor, to send your question to the cloud AI provider. The on-device core does not use the network. | Only via Oney — and only when you enable it and consent (see Section 4). |
| Motion & temperature sensors | Accelerometer for vibration; ambient temperature if present. Read locally. | No |
| Vibrate | To briefly buzz the phone so the accelerometer activates before a measurement. | — |
| Location (optional, off by default) | Only if you turn on location logging for a machine, to tag a measurement's coordinates. You control this per machine. | No — kept on your phone; can be deleted anytime. |
The app requests the Internet permission solely for the optional Oney AI assistant; with Oney unused, the app makes no network connection of its own.
Machines, history, notes, saved sounds and any recordings are stored locally in the app's private storage on your device. You are in full control of your local data:
If you used Oney, the records described in Section 4 are held on our server; you can request access or deletion of those at [email protected]. Apart from Oney, nothing is sent to us, so there is nothing on our side to request, correct, or delete.
If you use a share feature (e.g. the health card or a report), Android's standard share sheet lets you choose where to send it (mail, messaging, etc.). That action, and where it goes, is entirely your choice and handled by the apps you pick — not by us.
Some buttons (user guide, contact, "check for updates") hand off to a web page in your own browser. For those buttons the app makes no network connection of its own; your browser does, subject to its own privacy terms. (The one place the app itself uses the network is the Oney AI feature, described in Section 4.)
Check It is a general-purpose utility and is not directed at children. The on-device core collects no data; the optional Oney AI is a paid feature behind a consent screen.
For the on-device core, we process no personal data, so GDPR (EU), KVKK (Türkiye) and similar regimes impose minimal obligations; we nonetheless follow their principles of data minimization and on-device processing. Machine sound/vibration is not personal data.
For the optional Oney AI feature, the legal basis is your explicit consent. Using Oney involves transferring the content you send to a third-party cloud AI provider — currently Anthropic, PBC (United States) — which processes it internationally (in the United States). We may change or add providers; we will keep this policy updated. You have the right to access, correct or delete the Oney records we hold; contact [email protected].
If this policy changes, we will update this page and its effective date. Material changes will be reflected in the app's release notes.
Questions about privacy? [email protected].