catm

Tracking since May 29, 2026.

Changelog

• Jun 4, 2026
  description

  catm reads long-form text out loud, right inside your browser. Synthesis
    runs locally on your machine — no servers, no accounts, no telemetry.
    Text you select never leaves the browser.
  
    How it works
    ————————————
    1. Select any text on any page.
    2. Right-click → "Read it to me".
    3. The side panel opens and starts reading.
  
    What's in the side panel
    ————————————————————————
    • Four natural voices, previewable in one click before you commit.
    • Audio plays as it's generated — start listening within seconds of
      hitting Generate; the rest streams in as you go.
    • Text highlights along with the voice, so you can follow or skim.
    • Playback controls: pause, scrub, 0.75× – 2× speed.
    • A library of past readings, stored locally. Open old reads instantly.
    • Pop the panel out into a full tab when you want a wider reading view.
  
    How the privacy story holds up
    ——————————————————————————————
    • The Kokoro 82M TTS model downloads once into your browser cache
      (~310 MB) and runs via ONNX Runtime Web (WebGPU when available,
      WebAssembly fallback). Subsequent reads work fully offline.
    • Audio is encoded locally to fragmented MP4 and stored in OPFS — the
      browser's private file system for this extension alone.
    • No external scripts, no analytics, no remote requests after the
      first model download.
  
    Permissions
    ———————————
    • contextMenus — adds the "Read it to me" entry to the right-click menu.
    • storage — saves your voice choice and onboarding flag.
    • sidePanel — opens the reader in Chrome's side panel.
  
    Free and open source. MIT licensed.
    Source: github.com/catm-app/catm-app.github.io
    Privacy policy: catm-app.github.io/privacy.html

  catm reads long-form text out loud, right inside your browser. Synthesis
    runs locally on your machine — no servers, no accounts, no telemetry.
    Text you select never leaves the browser.

• Jun 4, 2026
  short_description

  On-device long-form text-to-speech in a side panel. Right-click selected text → Read it to me.

  On-device long-form text-to-speech in a side panel. Right-click → Read page.

• Jun 4, 2026
  permissions

  contextMenus, storage, sidePanel

  sidePanel, contextMenus, scripting, activeTab, storage

Permissions & access

Permissions

sidePanelcontextMenusscriptingactiveTabstorage

Host access

None declared

Screenshots