Voxcast

Speak. Reshape. Send.

A serious voice-to-text Android keyboard. Hold the button, talk, release — your speech is transcribed and reformatted into the active preset's output style, then auto-copied to the clipboard.

Derivative of Crazy-Keyboard — same plumbing (Expo / React Native, OpenRouter audio input, Gemini Flash Lite), serious-tool framing instead of novelty.

Presets

Grouped in the picker:

• Cleanup
  • Basic Cleanup — light cleanup of punctuation, casing, filler words. Preserves the speaker's voice.
• Work
  • Business Email — professional English email (subject + body, both copyable).
  • AI Prompt — restructured general-purpose LLM prompt.
  • Dev Prompt — engineering-focused prompt for a coding agent.
• Personal
  • To-Do List — bulleted action items.
  • Note to Self — concise first-person note.
• Hebrew
  • Casual Hebrew — casual conversational Hebrew text (Hebrew script).
  • Email (Hebrew) — professional Hebrew email (subject + body, both copyable).

Exactly one preset is active at a time. No layering.

Settings

• Your name — used as context. You are the sender; never addressed as the recipient or signed off with.
• OpenRouter API key — required. Stored via expo-secure-store.

Architecture

• App.js — single-screen UI. Hold-to-talk button, mode picker modal, settings/history modals.
• src/modes.js — preset catalog, system-prompt builder, and email subject/body parser.
• src/api.js — single OpenRouter call with inline base64 audio. Model: google/gemini-3.1-flash-lite-preview. Temperature 0.3 (low — these are serious presets).
• src/storage.js — SecureStore (API key) + AsyncStorage (settings, history). History keeps the last 10 entries.

Email modes (businessEmail, emailHebrew) instruct the model to return:

SUBJECT: <one line>

BODY:
<multi-line body>

parseEmailOutput() splits this into { subject, body } so the UI can render two copy buttons.

Build & install (dev loop)

Same flow as Crazy-Keyboard:

cd android
ANDROID_HOME=$HOME/android/Sdk ./gradlew assembleRelease
adb install -r app/build/outputs/apk/release/app-release.apk

Package: com.danielrosehill.voxcast (so it installs alongside Crazy-Keyboard, not on top of it).

Never do

• Do not reintroduce expo-file-system File API or readAsStringAsync — they fail on release builds. Audio→base64 goes through fetch(uri) → blob → FileReader.readAsDataURL.
• Do not expo prebuild --clean — wipes the android/ native folder including signing config.
• Do not skip signing or use --no-verify.