Privacy policy

Android edition · Updated October 5, 2026. StackWorks provides Write to Talk (かいて話そ).

Local board and storage

Drawn lines, typed or recognized text, personal phrases, cleared-board history and settings are handled on the device. The app does not transmit or synchronize them to our servers. Android automatic backup is disabled. There are no accounts, ads or developer-operated analytics.

Microphone and speech

Microphone permission is requested when you start listening. We use Android’s on-device Japanese SpeechRecognizer service when available, without switching to a cloud recognizer. The app does not record audio files or send speech or text to us. Listening stops when stopped by the user or when the app leaves the foreground. Recognized text appears on the board and is saved as history on clearing when that setting is enabled.

Preparing the language model may require communication with the speech service provider. The device, OS or service provider’s policies apply to its own technical diagnostics and data handling. The independent conversation sample uses neither the microphone nor the speech service.

Google Play purchases and diagnostics

Google Play Billing handles Plus product details, purchase status and purchase tokens for purchasing, verification and restoration. We do not receive payment card details. A verified entitlement result is cached locally. iOS purchases do not transfer to Android.

Billing SDK 9.1 sends technical diagnostic logs to Google about API use, results and billing connections. These include the package and app version, SDK and Android versions, and a random session identifier generated when the billing client initializes. This is not an Android ID or advertising ID. Logs may be sent during initialization, connection and verification even without purchasing; there is no app setting to disable only these SDK logs. Board text, drawings, audio, phrases and history are not passed into those logs. Google uses the diagnostics to improve service performance and address errors. Official Billing information

Deletion

Delete personal phrases or history in the app. Turning history off does not erase earlier records. Clear the app’s storage in Android settings or uninstall to remove all local settings and records. Purchase and refund records are managed by Google Play and are not changed by deleting app data.

Communication assistance

The app assists everyday communication, including written conversation. It does not use Health Connect, health-record APIs or AccessibilityService. Any medical content entered by the user receives the same local-only treatment as other board text.

External links and contact

External pages open in a browser and follow that website’s policies. Email content is used to respond to your inquiry. Do not send unnecessary conversation content or personal information. Contact StackWorks at contact@stack-works.dev. Changes to this policy will appear here.