Where the model runs determines four things you actually care about: privacy, offline capability, speed consistency, and cost.
The model runs on your computer.
Advantages:
- Privacy — audio never leaves your machine. For unreleased work or client material under NDA, this can be the deciding factor.
- Offline — works on a plane, in a studio with no connectivity, anywhere.
- No per-use cost — run it a thousand times, it's free.
- No upload wait — a 50MB file doesn't need uploading.
Disadvantages:
- Hardware-bound. A five-year-old laptop will be slow. Some models simply won't fit in memory.
- Model size limits. The best models are large; smaller on-device versions are usually meaningfully worse.
- Update friction — you download new versions.
The model runs on a server.
Advantages:
- Bigger models. Server GPUs run models no laptop can hold.
- Consistent speed regardless of your hardware — a Chromebook gets the same result as a workstation.
- Always current. Improvements arrive without you doing anything.
- Light client. The app stays small.
Disadvantages:
- Your audio is uploaded. Read the terms.
- Needs a connection. No signal, no feature.
- Upload time for large files.
- Usually metered. Someone is paying for that GPU.
This is the one people skip. Before uploading unreleased material, check:
- Is user content used for training? Some services say explicitly no; others reserve the right.
- How long is audio retained?
- Who can access it?
- Is there a deletion path?
For a hobbyist demo this may not matter. For an unreleased album or client work under NDA, it very much does.
Most tools split it: light processing local, heavy models remote. A browser DAW mixes and plays locally while separation and generation run server-side.
That gives you responsive editing with access to large models — at the cost of needing a connection for the AI features specifically.
Practical advice: if you regularly work offline, verify which features survive disconnection before you depend on the tool. It's usually not in the marketing.
Related reading: cloud rendering for audio, offline-first web apps for music, and CPU vs GPU audio processing.
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