Privacy
Policy

1. Information We Collect

We collect no information. Sigma Vox does not collect, store, transmit, or process any personal data, usage data, or device data.

2. How the App Processes Data

All processing in Sigma Vox occurs exclusively on your device:

• Speech recognition — your voice is processed locally using Apple's Speech framework and on-device Siri language models. Audio is never sent to any server.
• Language understanding — questions are processed by Apple Intelligence (FoundationModels framework), which runs entirely on-device on Apple Silicon hardware.
• Voice synthesis — responses are spoken using AVSpeechSynthesizer, Apple's on-device text-to-speech engine.
• Knowledge file — the file you load is read into memory only. It is never written to Sigma Vox's storage and is not accessible after you close the app or clear the knowledge.

3. Data Sharing

We share no data with any third party — because we collect no data to share. Sigma Vox has no backend infrastructure, no analytics service, no advertising network, and no cloud dependency of any kind.

4. Network Access

Sigma Vox does not make network requests during normal operation. The app functions completely in airplane mode. No telemetry, crash reports, or usage data is transmitted over the network.

The only network activity that may occur is initiated by the operating system itself — for example, Apple's Speech framework may optionally use network-based recognition if on-device recognition is unavailable for a specific language. This behavior is controlled entirely by Apple and is governed by Apple's own privacy policy, not Sigma Vox's.

5. Device Permissions

Sigma Vox requests the following device permissions:

• Microphone — required to capture your voice for speech recognition. Audio is processed locally and never recorded or transmitted.
• Speech Recognition — required to use Apple's on-device speech-to-text capability. No audio leaves your device through Sigma Vox.
• File access (read only) — required so you can select a knowledge file from your device. Files are read once into memory and not copied or stored by the app.

You may revoke any permission at any time in Settings → Privacy & Security. Revoking the microphone or speech recognition permission will prevent voice input functionality.

6. Children's Privacy

Sigma Vox does not collect data from any user, including children under the age of 13. The app has no account system, no social features, and no content targeted at children. It complies with the Children's Online Privacy Protection Act (COPPA) by design — there is nothing to collect.

7. Data Retention

Sigma Vox stores only your preferences locally on your device — these include your selected input language, knowledge mode setting, and whether Totem Mode or Conversation Mode is enabled. These preferences contain no personal information and can be cleared at any time by deleting the app.

No voice recordings, transcripts, file contents, or interaction history are stored anywhere by Sigma Vox.

8. Your Rights

Because Sigma Vox collects no personal data, there is no data to access, correct, export, or delete. If you wish to remove the app's locally stored preferences, delete Sigma Vox from your device — this removes all data associated with the app.

9. Changes to This Policy

If this privacy policy changes in a future version of Sigma Vox, the updated policy will be posted at this URL with a new effective date. We will not reduce your privacy protections without providing clear notice.

10. Contact

Questions about this privacy policy or Sigma Vox's privacy practices: