A cloud AI service receives the words you send it. The company may retain them or use them to improve its models. Running AI locally changes where that information goes: a voice-enabled assistant can transcribe speech and generate replies on your Mac, without sending the conversation to a cloud service. section 1.1 section 1.0
The difference matters most when a conversation contains information you would not normally share with a third party:
- Personal conversations, such as journal entries or discussions about emotions. section 14.2.3
- Workplace information, such as customer data, source code, financial details, or internal plans. section 14.2.3
- Client, patient, or student information that may be subject to confidentiality rules or restrictions on sharing. section 14.2.3
Table 14.1 Comparing the privacy characteristics of cloud and local AI
| Aspect |
Cloud AI |
Local AI (Ollama) |
|---|---|---|
| Data location |
Company servers (often in US) |
Your device only |
| Data in transit |
Encrypted but transmitted |
Never transmitted |
| Data retention |
May be stored for 30+ days |
Not stored (unless you choose) |
| Training use |
May be used to improve models |
Never used by anyone |
| Staff access |
Support staff may review chats |
No external access |
| Breach risk |
Subject to server breaches |
Only if device is compromised |
| Regulatory compliance |
Varies; often unclear |
Full user control |
| Terms of service |
Company can change terms |
No third-party terms |
Compare where cloud and local AI place data, whether they transmit or retain it, and who may be able to access it. These are architectural differences, not a guarantee that every local application is private. section 14.2.3 section 14.6
Try an offline check
Put your Mac in airplane mode and try the Ollama-based chatbot. If it still works with full capability, you have verified that this chatbot does not need an internet connection for that interaction. Privacy also depends on the surrounding application, operating system, and network configuration. section 14.0 section 14.6
Local processing gives you more control over sensitive conversations, but it is not an accusation that cloud providers are careless: sending data to another server necessarily gives up some control. A practical choice is to use local AI for sensitive tasks and cloud AI when you need its greater capability. section 14.2.3 section 14.6
