Privacy Policy
1. Introduction & Overview
At Kubun Labs, we prioritize your privacy and data transparency. Kubun Translate is designed as a privacy-conscious, real-time voice-to-voice translation application. This Privacy Policy details how voice audio, text transcripts, and API interactions are handled when you use the app.
Our core commitment is that we do not collect, store, or sell personal identifiers or persistent voice recordings on our servers. Audio processing occurs strictly on an ephemeral basis to deliver real-time translation during active conversation sessions.
2. Data Processing & Cloud Service Providers
To provide instantaneous speech-to-text, neural translation, and natural voice synthesis, spoken audio and temporary transcript payloads pass securely through our Cloudflare Worker API edge proxy to specified cloud AI service providers.
Data flows through the following specialized sub-processors:
- Deepgram API (Speech-to-Text): Captured audio segments are transmitted securely via TLS encryption to Deepgram solely for real-time speech transcription. Audio payloads are processed ephemerally in memory and are discarded immediately following transcription.
- DeepL API (Neural Machine Translation): Text transcripts generated from speech are sent to DeepL to convert text into the requested target language. DeepL processes text payloads ephemerally and does not use client text for model training.
- Inworld AI (Text-to-Speech): Translated target text is transmitted to Inworld AI to generate natural voice speech audio chunks. The resulting audio data is streamed back to your device and is not retained by the cloud provider.
3. Local Device Storage
Conversation logs, language preferences, and audio settings are stored exclusively on your device within an encrypted local Room Database.
- Local transcripts and history remain under your complete control.
- You can clear your local chat history at any time directly within the app settings.
- Local application data is excluded from automatic third-party cloud backups.
4. Android Device Permissions
Kubun Translate requests only the strictly necessary runtime permissions required for operational function:
- RECORD_AUDIO: Required to record microphone input for local VAD silence detection and real-time translation. Audio is recorded only when conversation mode is active.
- INTERNET: Required to transmit encrypted audio frames to our API proxy and stream translation results.
The app does not request or require access to your device location, contacts, media gallery, or external storage.
5. Data Security & Ephemeral Retention
All network communication between the Android application, Cloudflare Worker proxy, and third-party AI processing APIs uses HTTPS with mandatory Transport Layer Security (TLS 1.3).
Voice audio snippets sent to cloud providers are held in transient RAM only for the milliseconds required to return speech results and are deleted immediately thereafter.
6. Contact Information
If you have questions regarding this Privacy Policy or Kubun Translate architecture, please reach out to:
Kubun Labs Engineering
Email: support@kubunlabs.com