A cross‑platform desktop screen recorder that captures your screen in high resolution with system audio and an isolated microphone track, then denoises your voice and merges everything into a single clean H.264 MP4 — all fully offline.
⬇️ One‑click download · Features · How it works · Build · Contributing
| 🎥 High‑res screen | Records at the source's native resolution (Retina/4K), up to 60 fps. |
| 🔊 System audio | Captures the actual computer output (app sound, video playback), not just the mic. |
| 🎙️ Isolated mic track | Your voice saved raw on its own track — no suppression, gain, or echo cancellation. |
| 🪄 Auto clean + merge | Denoises the voice and merges it with system audio into one H.264/AAC MP4. |
| 🗜️ Optional compression | One click to shrink the final file to 1080p or 720p for easy sharing. |
| 🪟 Pick any window | Choose a screen or any window — on macOS via Apple's picker (all desktops), on Windows/Linux via an in‑app grid. |
| 📁 Your save folder | Pick where recordings go, any time, from the in‑app Save to → Change… bar. |
| 🔒 Fully offline | All processing runs locally through a bundled ffmpeg. No cloud, no account, no model download. |
Get it in one click → (auto‑detects your OS)
Or pick a specific build from the Releases page:
| Platform | Installer |
|---|---|
| 🍎 macOS (Apple Silicon) | CrispCast-<ver>-arm64.dmg |
| 🍎 macOS (Intel) | CrispCast-<ver>.dmg |
| 🪟 Windows | CrispCast-Setup-<ver>.exe |
| 🐧 Linux | CrispCast-<ver>.AppImage / .deb |
First launch — the app is unsigned, so open it like this
Because the builds aren't code‑signed, the OS warns you the first time:
- macOS — right‑click (Control‑click) the app → Open → confirm. If needed, allow it under System Settings → Privacy & Security → Open Anyway. Also grant Screen Recording (System Settings → Privacy & Security → Screen Recording) and relaunch.
- Windows — on the SmartScreen prompt, click More info → Run anyway.
flowchart LR
A["🎥 Screen + 🔊 system audio<br/>+ 🎙️ raw mic"] --> B["🪄 Auto‑denoise<br/>the voice"]
B --> C["🎬 Merge into one<br/>clean H.264 MP4"]
C --> D["🗜️ Optional<br/>compress"]
Recordings save to a folder you choose (default Movies/CrispCast on macOS, Videos/CrispCast on Windows/Linux). The mic is kept on its own track so it can be cleaned independently, then remuxed back:
| File | Contents |
|---|---|
recording-<time>.webm |
Screen video (native res) + system audio |
recording-<time>-voice.webm |
Your microphone, raw |
recording-<time>-clean.mp4 |
Final video with the denoised voice mixed in |
The offline denoise chain is a simple ffmpeg filter — cut rumble/hiss/AC noise, then normalize loudness (tune VOICE_FILTER in main.js):
highpass=f=80 · afftdn · anlmdn · loudnorm
The raw .webm files are always kept, so you can re‑clean with different settings anytime.
| OS | Choose a window | System audio |
|---|---|---|
| 🍎 macOS 14+ | Native ScreenCaptureKit picker — all windows, all desktops | ✅ ScreenCaptureKit loopback |
| 🪟 Windows | In‑app grid — all windows | ✅ WASAPI loopback |
| 🐧 Linux | In‑app grid — all windows (X11; Wayland via PipeWire portal) |
Full per‑OS details, permissions, and packaging notes: CROSS_PLATFORM.md.
git clone https://github.com/codewithowais/CrispCast.git
cd CrispCast
npm install
npm startBuild installers for the current OS (needs Node ≥ 20):
npm run dist # → .dmg / .exe / .AppImage / .deb in dist/Releases are built automatically by GitHub Actions on every v* tag — see RELEASING.md.
Contributions are welcome! See CONTRIBUTING.md for setup, the project layout, running the self‑test (electron . --selftest), and how to open issues and PRs.
MIT © 2026 codewithowais