ThreadCast

Tracking since May 12, 2026.

Changelog

• Jun 19, 2026
  description

  ### Threads, now a podcast.
  
  ThreadCast turns any Reddit thread into a hands-free listening experience. Build a queue, press play, and let it narrate posts and top comments aloud — perfect for commuting, chores, the gym, or winding down for sleep.
  
  Three voice engines, eleven AI neural voices, eleven ambient soundscapes, full multi-voice narration. All on-device. All free. No accounts, no ads, no tracking.
  
  ---
  
  ### 🎙 Three voice engines, your choice
  
  ThreadCast ships with three different TTS engines so you can pick the trade-off that matches your machine:
  
  - **System voices** — instant. Uses the voices already installed on your operating system (Windows, macOS, Linux). Zero downloads, zero setup.
  - **AI neural · CPU** — natural-sounding speech from a 28-million-parameter neural model. Runs entirely on your CPU via WebAssembly. Downloads once (~30 MB per voice), then plays offline forever.
  - **AI neural · GPU** — premium quality from an 82-million-parameter neural model with eleven distinct voices and accents. Runs on your GPU via WebGPU. Downloads once (~310 MB), then plays offline forever.
  
  Switch engines at any time from the popup. ThreadCast remembers your pick.
  
  ### 🗣 Multi-voice narration
  
  Each Reddit author gets their own consistent voice. ThreadCast detects gender from username cues and pronouns, then assigns a voice from the rotation — so a thread reads like a real conversation between distinct people, not a single monotone reading.
  
  - Pick how many voices to rotate (up to 10)
  - Filter voices by accent
  - Set per-author overrides that persist across sessions
  - Preview any voice before committing
  
  ### 📰 Posts AND comments
  
  Add the post and the conversation. Or add comments only. Or specific comments, by clicking + on each one. Drag items in the queue to reorder. Skip, scrub, jump back — full transport control with a drag-to-seek scrubber so you can rewind that punch line.
  
  ### 😴 Sleep mode with ambient soundscapes
  
  A separate playback mode designed for falling asleep. Slowed narration layered over a choice of ten ambient soundscapes:
  
  Calm Night · Time · Twilight · Flute · Ocean · Lullaby · Stillness · Drift · Mellow · Cradle
  
  Set a sleep timer (15 / 30 / 60 / 90 minutes, or "until queue ends") and ThreadCast fades out gracefully so you drift off without a hard cut. Independent voice and ambient mix sliders. Configurable sleep playback rate.
  
  ### ⚙ Power-user settings
  
  A full options page with:
  
  - Speed, pitch, volume, and inter-sentence pause sliders
  - Multi-voice rotation control with manual overrides
  - Voice catalog with previews for every engine
  - Per-author voice overrides
  - Sleep mode rate, ambient category, and fade-out duration
  - Engine-specific download manager with per-file progress bars
  - Export / import all your settings as JSON
  
  ### 🔒 Private by design
  
  ThreadCast does not collect, transmit, or store what you read on Reddit. Speech synthesis runs entirely on your device — no audio is ever sent to a server.
  
  The optional AI neural engines download model weights once from a public Hugging Face mirror (huggingface.co/Pixel-Labs/threadcast-neural-models). After that, they run fully offline forever.
  
  No tracking. No analytics. No ads. No accounts.
  
  Full privacy policy: https://threadcast.app/legal/privacy
  
  ---
  
  ### How to use
  
  1. Install ThreadCast from the Chrome Web Store.
  2. Open Reddit (reddit.com or sh.reddit.com).
  3. Hover any post or comment and click the **+** chip to add it to the queue.
  4. Click the ThreadCast icon in your toolbar and press **▶ Play**.
  5. Open **⚙ Settings** to switch engines, customise voices, and configure sleep mode.
  
  ---
  
  ### Supported platforms
  
  - Chrome 113+ (and Chromium-based browsers: Edge, Brave, Opera, Vivaldi, Arc)
  - Manifest V3
  - Reddit: new Reddit (`reddit.com`, `sh.reddit.com`). old.reddit.com is not supported.
  - Language: English (United States, United Kingdom)
  - WebGPU is required only if you choose the GPU AI neural engine
  
  ### Open source
  
  ThreadCast is free forever for Reddit. No subscriptions. No accounts. No ads.
  
  ### Support
  
  - Email: [email protected]
  - Privacy: [email protected]
  - Website: https://threadcast.app
  
  ThreadCast is an independent project and is not affiliated with, endorsed by, or sponsored by Reddit, Inc.

  Threads, now a podcast.
  
  Play and replay long Reddit threads, nothing leaves your device.
  
  ThreadCast turns any Reddit thread into a hands-free listening experience. Build a queue, press play, and let it narrate posts and comments aloud, perfect for commuting, chores, the gym, or winding down for sleep.
  
  Four voice engines, multi-voice narration, ten ambient soundscapes, and a Chrome side panel that stays open beside Reddit while you read. All on-device. All free. No accounts, no ads, no tracking.
  
  
  🎙 Four voice engines, your choice
  
  ThreadCast ships with four voice engines so you can pick the trade-off that matches your machine.
  
  • System voices. Instant. Uses the voices already installed on your operating system (Windows, macOS, Linux). Zero downloads, zero setup.
  • AI Neural CPU. Natural-sounding neural speech that runs entirely on your CPU via WebAssembly. Downloads once, then plays offline.
  • AI Neural GPU Lite. A lighter neural engine that runs on your GPU via WebGPU. A smaller one-time download than the full GPU tier, with quality close behind it.
  • AI Neural GPU. The highest-quality engine, with eleven distinct voices and accents, running on your GPU via WebGPU. A larger one-time download, then fully offline.
  
  Switch engines any time from the popup or side panel. ThreadCast remembers your pick.
  
  
  🗣 Multi-voice narration
  
  Each Reddit author gets their own consistent voice. ThreadCast detects gender from username cues and pronouns, then assigns a voice from the rotation, so a thread reads like a real conversation between distinct people, not a single monotone reading.
  
  • Pick how many voices to rotate
  • Filter voices by accent
  • Set per-author overrides that persist across sessions
  • Preview any voice before committing
  
  
  📰 Posts and comments
  
  Add the post and the conversation. Or comments only. Or specific comments, by clicking + on each one. Reorder the queue, then skip, scrub, and jump back with full transport control and a drag-to-seek scrubber, so you can rewind that punch line.
  
  
  🪟 A side panel that stays put
  
  Open ThreadCast as a Chrome side panel and your queue and transport stay docked beside Reddit while you keep browsing, with no popup that closes the moment you click away. Prefer the classic popup? Switch between side panel and popup any time in Settings.
  
  
  😴 Sleep mode with ambient soundscapes
  
  A separate playback mode designed for falling asleep. Slowed narration layered over a choice of ten ambient soundscapes:
  
  Calm Night · Time · Twilight · Flute · Ocean · Lullaby · Stillness · Drift · Mellow · Cradle
  
  Set a sleep timer and ThreadCast fades out gracefully so you drift off without a hard cut. Independent voice and ambient mix sliders. Configurable sleep playback rate.
  
  
  ⚙ Power-user settings
  
  A full options page with:
  
  • Speed, pitch, volume, and inter-sentence pause sliders
  • Multi-voice rotation control with manual overrides
  • Voice catalog with previews for every engine
  • Per-author voice overrides
  • Sleep mode rate, ambient soundscape, and fade-out duration
  • Engine download manager with per-file progress bars
  • Light, dark, and system themes, plus a toolbar toggle between side panel and popup
  • Export and import all your settings as JSON
  
  
  🔒 Private by design
  
  ThreadCast does not collect, transmit, or store what you read on Reddit. Speech synthesis runs entirely on your device. No audio is ever sent to a server.
  
  The optional AI neural engines download model weights once from a public Hugging Face mirror. After that, they run fully offline.
  
  No tracking. No analytics. No ads. No accounts.
  
  Full privacy policy: https://threadcast.app/legal/privacy
  
  
  🚧 Coming soon
  
  We're actively building the next chapter of ThreadCast:
  
  • Save as MP3. Export a post, a comment, or your whole queue as a single audio file with chapters, to listen anywhere.
  • Beyond Reddit. Open PDFs, EPUBs, web articles, or your own text and listen with the same on-device voices.
  
  Both arrive in a future update.
  
  
  How to use
  
  1. Install ThreadCast from the Chrome Web Store.
  2. Open Reddit (reddit.com or sh.reddit.com).
  3. Hover any post or comment and click the + chip to add it to the queue.
  4. Click the ThreadCast icon in your toolbar (or open the side panel) and press Play.
  5. Open Settings to switch engines, customise voices, choose side panel vs popup, and configure sleep mode.
  
  
  Supported platforms
  
  • Chrome 114+ (and Chromium-based browsers: Edge, Brave, Opera, Vivaldi, Arc)
  • Manifest V3
  • Reddit: new Reddit (reddit.com, sh.reddit.com). old.reddit.com is not supported.
  • Language: English (United States, United Kingdom)
  • WebGPU is required only if you choose a GPU AI neural engine (GPU Lite or GPU)
  
  
  Free
  
  ThreadCast is free for Reddit. No subscriptions. No accounts. No ads.
  
  
  Support
  
  • Email: [email protected]
  • Privacy: [email protected]
  • Website: https://threadcast.app
  
  ThreadCast is an independent project and is not affiliated with, endorsed by, or sponsored by Reddit, Inc.

• Jun 19, 2026
  host_permissions

  *://*.reddit.com/*, https://huggingface.co/*, https://cdn-lfs.huggingface.co/*, https://cdn-lfs-us-1.huggingface.co/*

  *://*.reddit.com/*, https://huggingface.co/*, https://cdn-lfs.huggingface.co/*, https://cdn-lfs-us-1.huggingface.co/*, https://cas-bridge.xethub.hf.co/*, https://*.xethub.hf.co/*

• Jun 19, 2026
  permissions

  storage, activeTab, scripting, tabs, alarms, offscreen

  storage, activeTab, scripting, tabs, alarms, offscreen, sidePanel

Permissions & access

Permissions

storageactiveTabscriptingtabsalarmsoffscreensidePanel

Host access

*://*.reddit.com/*, https://huggingface.co/*, https://cdn-lfs.huggingface.co/*, https://cdn-lfs-us-1.huggingface.co/*, https://cas-bridge.xethub.hf.co/*, https://*.xethub.hf.co/*

Screenshots