PrivTTS Privacy Policy

Effective date: September 14, 2026

PrivTTS ("the app," "we," "our") is a text-to-speech reading app. This policy explains what happens to your data when you use it.

The short version

PrivTTS converts text to speech entirely on your device. We do not collect, transmit, sell, or share your text, documents, voice recordings of you (we never access your microphone), usage history, or any other personal data. The app does not require an account, login, or any personal information to function. The only outbound network requests PrivTTS makes are to download the open-source voice files you choose to install (see "Voice downloads" below) — your text and documents are never part of those requests, or of any other network activity.

What data PrivTTS accesses on your device

• Text you provide. Text you paste, type, or import (from TXT, DOCX, RTF, or PDF files you choose via your device's file picker) is processed and converted to speech locally, on your device's processor. It is never uploaded to us or to any third party, and we have no server that could receive it even if we wanted to.
• Files you import. When you use the "Import file" feature, PrivTTS reads the file you explicitly select through the operating system's document picker. PrivTTS does not browse, index, or access other files on your device.
• Playback state. Reading position, selected voice, and playback speed are stored locally on your device (e.g., to resume where you left off) and are never transmitted anywhere.

Voice downloads

PrivTTS ships with one voice built in and offers additional voices you can download from within the app (Voices screen). Downloading a voice fetches an open-source model file directly from the sherpa-onnx project's public GitHub release files — a plain file download, the same as downloading any file from a website. This request contains no personal data: not your text, not your device's advertising or account identifiers, nothing you've typed or imported. We do not operate or control the server that hosts these files; GitHub's own privacy statement governs that download request the same way it would for any file you downloaded from GitHub in a web browser. Once downloaded, a voice runs entirely on your device like the built-in one — no further network activity is needed to use it, and you can delete it at any time from the Voices screen.

What PrivTTS does not do

• We do not use your microphone. PrivTTS has no audio recording capability — it only plays synthesized speech back to you.
• We do not require or request an account, email address, or sign-in of any kind.
• We do not use third-party analytics, advertising, or tracking SDKs.
• We do not transmit your text, documents, or usage data to us or to any third party — the app has no backend server of its own, and the only network requests it ever makes are the plain file downloads described under "Voice downloads" above, which carry none of your content.
• We do not use your data to build any kind of profile, and we cannot, because we never receive it.

Diagnostics

PrivTTS may record basic technical information locally on your device (such as how long an operation took, or a generic error code) purely to help the app function correctly (e.g., detecting a failed synthesis attempt so it can be retried). This diagnostic information never includes the content of your text or documents, is stored only on your device, and is not transmitted to us.

Subscriptions

If PrivTTS offers a paid "Pro" tier, purchases are handled entirely by Apple's App Store / In-App Purchase system. We do not receive or store your payment information — Apple's own privacy policy governs that transaction.

Children's privacy

PrivTTS does not knowingly collect any personal data from anyone, including children, because it does not collect personal data from any user. The app is not directed at children specifically but contains no age-inappropriate content by design (it reads back whatever text the user provides).

Third-party open-source components

PrivTTS uses on-device, open-source speech synthesis models (see in-app Settings → Acknowledgements for the current list and their licenses, and "Voice downloads" above for how they reach your device). Once installed, they run entirely on your device and do not transmit any data anywhere.

Changes to this policy

If PrivTTS's data practices change (for example, if a future version adds cloud sync, an account system, or analytics), we will update this policy before that version is released and update the effective date above.

Contact

Questions about this policy: [email protected]