The short version
SiloCast collects no data. None.
No analytics. No telemetry. No account. No personal data. No usage metrics. No error beacons. No advertising IDs. No fingerprinting. No crash reports. No data of any kind is collected, stored, transmitted, or shared by SiloCast about you, your device, or your recordings.
Everything SiloCast does — multi-track recording, bleed and cross-talk separation, transcription, transcript-based editing, and content generation — runs entirely on your Mac, on-device, using a bundled local runtime and locally-stored open-weights models (a UVR separation model, a Whisper speech-to-text model, and a language model). There is no cloud component. There is no server. There is no SiloCast account.
What we don't have, and therefore never see
Because SiloCast has no server-side component, the following do not exist anywhere in our infrastructure (and our infrastructure consists of: nothing):
- Your name, email, phone, or address.
- Your IP address, device identifier, MAC address, or any other hardware fingerprint.
- The audio you record, the isolated tracks SiloCast produces, the transcripts it generates, the show notes and newsletters it drafts, or any file you export.
- The contents of your Documents, Downloads, Desktop, or any other folder.
- Session timing, feature usage, button clicks, or any other behavioural data.
- Crash reports. SiloCast does not implement a crash-reporting SDK.
We never see any of this because none of it is ever sent. The app does not phone home, ever.
The local backend is not a network service
SiloCast runs a small local Python (FastAPI) process to perform audio separation, transcription, and content generation. It binds strictly to the loopback interface (127.0.0.1:8765), never to a public or network-facing address. The SwiftUI host renders the editor in a WKWebView loaded from that same loopback origin. This is on-device inter-process communication (IPC) only — a private channel between the macOS capture layer and the on-device engines. It accepts no external connections and is not reachable from your network or the internet.
Outbound traffic you initiate
Three classes of outbound network traffic can originate from your Mac while SiloCast is running. None of them go to SiloCast. All of them are user-initiated:
- Model weight downloads. The first time you separate tracks, transcribe, or generate content, SiloCast downloads the relevant UVR, Whisper, and language model weights from public open-weights repositories — primarily Hugging Face. The download is anonymous by default; no token, account, or registration is required. Once the weights are on disk, every separation, transcript, and draft after that is fully offline.
- Mac App Store updates.When Apple ships a SiloCast update, the Mac App Store delivers it. This traffic is between your Mac and Apple's servers, governed by Apple's privacy policy. SiloCast is not involved.
- Links you click. If you click an external link inside the app (for example, opening this privacy policy), your default browser handles the request. SiloCast is not involved.
Permissions we request, and why
SiloCast asks for a single macOS permission, used only to capture audio on your device for local recording, and it never sends anything off your Mac:
- Microphone. macOS gates all audio-input capture behind the Microphone permission. SiloCast uses it to record your hosts and guests through your input devices — each microphone on its own track — and to capture the system audio loopback of a remote call, which macOS presents as an audio input device through Core Audio (AVAudioEngine).
That is the only permission SiloCast requests. It does not ask for Screen Recording, Camera, Contacts, Location, or Full Disk Access. System audio is captured as an input device, not by recording your screen.
On-device data you create
The audio you record, the tracks, transcripts, and marketing assets SiloCast produces, and your local preferences live on your disk under ~/Library/Containers/com.silosystems.silocast/Data/Library/Application Support/SiloCast/ (plus any folder you explicitly choose to export to). They are yours. We do not have access to them. Deleting SiloCast removes the app; your work remains under its container until you delete it manually.
Children's privacy
SiloCast is rated 4+ on the Mac App Store. Because no personal data is collected from any user, no special treatment is required for users under 13. Same policy applies regardless of age: nothing collected.
Third-party services
SiloCast uses these open-source components and public services. None of them receive any data about you from SiloCast:
- UVR / HT-Demucs (open-weights source-separation model) — runs locally to isolate tracks and remove bleed.
- Whisper (open-weights speech-to-text model, MLX port via mlx-whisper) — runs locally.
- Language model (open-weights instruction-tuned model) — runs locally via mlx-lm to draft show notes, chapters, and newsletters.
- MLX(Apple's on-device array/ML framework) — runs locally.
- Hugging Face Hub — contacted only when you run a step for the first time and the model weights are downloaded.
Changes
If we ever materially change how SiloCast handles data — for example, if a future version of the app ever begins to collect anything at all — we will publish an updated version of this page, announce the change prominently in the release notes, and require explicit consent in-app before any new collection begins. The effective date at the top of this document reflects the current policy.
The current policy is: nothing is collected.
Contact
Questions about this policy: admin@ohmslaw.net
For non-private inquiries you can also open an issue at github.com/flowmar47/SiloCast.