Here is the twist nobody tells you: the app is not the expensive part. The hardware is. Keep that in mind and the whole pricing picture makes sense.
Free on-device AI apps are real and good. The open-source ones, PocketPal AI on Android and iOS, give you genuine offline chat with GGUF models for nothing. If you want an on-device AI admin app, free and open, that is the honest starting point. The catch is the usual open-source deal: you are the support department. Model files, quantization choices, troubleshooting when something will not load, all you. For personal use, fair trade. For a business, a hidden cost wearing a free price tag.
Paid apps sell convenience, not models. Nicer interfaces, chat history sync, priority support, sometimes bundled model downloads so you skip the file hunt. Worth it? Depends what your time costs and how many people need the setup. But read what the payment actually covers. Some paid AI apps quietly route your chats through their own servers, which defeats the entire point of on-device. If the marketing will not say plainly where inference happens, assume the worst. I mean that.
Third price, the one nobody puts on the website: hardware for bigger models. A phone handles small models. A serious local setup wants a real GPU. That is where the actual budget goes. Every time.
Our database of 200 open-weight models shows what each one needs to run, so you can price the hardware honestly before committing. Best free LLM models for your machine, best local LLM for your budget, same search. Want the private setup without becoming your own IT department? I do private AI setup for businesses at privateaiagent.fyi. Your data never leaves.