AI on your phone or in the cloud: a table and 5 questions
The short answer: AI that runs on your phone processes text without sending it anywhere, works without a signal and uses the device's battery and memory. Cloud AI sends the text to a server, uses larger models and handles long texts better, but it depends on your connection and on the provider's policy.
How privacy differs between phone AI and cloud AI
With AI on your phone, the text being analysed never leaves the device during processing. With cloud AI, it travels to a server and is processed there. The difference is real, but it does not settle the privacy question on its own:
- Local does not mean isolated: if the app later syncs the result (a summary, a label, a suggested reply), that result does end up on a server.
- Cloud does not mean exposed: encryption in transit protects the text on its way, and the provider can commit to not storing it or using it to train models. What matters is what they put in writing.
- The server's country matters: the text may be processed inside or outside the European Union, and the privacy policy should say which.
- Your rights stay the same: the GDPR lets you request access to your data and its deletion; whoever processes it must respond within one month, which can be extended by two further months if the request is complex.
If the AI reads your email, the starting point is understanding what an assistant knows about you before deciding where you would rather it was processed.
How speed differs between phone AI and cloud AI
Local AI avoids the round trip over the network, so for short tasks it usually starts responding sooner: sorting an email, pulling out a date or suggesting a one-line reply. The cloud makes up for that trip with far more powerful machines. For longer tasks, such as summarising a lengthy thread or cross-checking the week's calendar against several emails, it can finish first even if it takes longer to get going.
Other factors come into play too:
- Your phone model: older devices cannot run certain models, so the app falls back on the cloud or switches the feature off.
- Battery and temperature: a hot phone or one in power-saving mode slows down, and local AI feels noticeably slower.
- Signal: in a tunnel, on a train or in a basement, cloud AI is left waiting while local AI carries on working.
There is no fixed rule: it depends on the device, the length of the text and the network at that moment.
Phone AI versus cloud AI: comparison table
| Aspect | AI on your phone | AI in the cloud |
|---|---|---|
| Where the text is processed | On the device itself | On the provider's servers |
| Works offline | Yes, if the model is downloaded | No |
| Short tasks | Usually starts sooner | Adds network time |
| Long texts or multiple sources | Limited by memory and battery | Larger models, more context |
| Battery use | Higher while processing | Lower, the server does the work |
| What to check | Whether the result is synced afterwards | Retention, server country, use for training |
| Model updates | Arrive with the app or the operating system | Change without touching your phone |
5 questions to find out where an app processes your text with AI
- What does the privacy policy say about AI?: check whether it names the model provider and the country where the text is processed.
- Does the feature respond in aeroplane mode?: if it keeps working without a network, it runs on the device; if it fails or hangs, it relies on the cloud.
- Is the text stored after processing?: check whether the provider keeps it and for how long, or discards it once it has responded.
- Is it used to train models?: the policy should say so explicitly; if it is unclear, ask the support team.
- Can you switch the AI off without losing the app?: a clear toggle lets you use the rest of the features while keeping your data away from the model.
Wherever they run, both options make similar mistakes, so it is worth reviewing common AI mistakes with dates before trusting a summary.
How Madrugo handles AI in the daily summary
Madrugo prepares your daily summary with AI using your email, calendar and tasks, and that AI may process the text outside the European Union, as explained in Madrugo's privacy policy. Madrugo's servers and database are in the European Union. If you would rather no model read your data, you can switch the AI off: the summary is still produced, but on the server and without it.
Some calculations stay on the iPhone itself. ‘Time to Leave’ uses Apple Maps to work out when to set off for your next appointment with an address, without sending your location to Madrugo. It is a good example of the general rule: anything that can be handled on the device does not need to travel.
Frequently asked questions
- Does phone AI work without the internet?
- AI that runs on your phone works without the internet as long as the model has been downloaded to the device. Features that rely on the cloud stop responding or hang until the connection returns, so aeroplane mode is a handy way to check where each one is processed.
- Is AI on your phone more private than AI in the cloud?
- AI on your phone is more private in one specific respect: the text does not leave the device while it is being processed. Overall privacy also depends on whether the result is synced afterwards and, in the cloud, on how long the text is stored and which country the server is in.
- Which AI responds faster, phone AI or cloud AI?
- Phone AI usually starts responding sooner on short tasks because it does not wait for the network. Cloud AI can finish first with long texts or multiple sources, because it uses more powerful machines. The outcome depends on the phone, the length of the text and the signal.
- Can I use Madrugo without the AI reading my email?
- Madrugo lets you switch the AI off. With the AI switched off, your daily summary is still prepared, but on Madrugo's server and without AI. Madrugo's servers and database are in the European Union, and the privacy policy explains where the AI may process the text.