Privacy-First iPhone Apps That Keep Data on Device

Privacy-first iPhone apps keep your data on your device and do their work there. A privacy-first app has no account, no server holding your content and no hidden tracking. Some apps still need the network for one task, such as an online search or ads. A good app says so clearly. This post explains what on-device means and shows how each of our apps handles data.

What on-device means

On-device means the app stores and processes your content in its own container on your iPhone. The container is a private storage area that iOS gives each app. When you delete the app, iOS removes that container and everything in it.

On-device processing goes one step further. The app does the work, such as converting a file or checking a calculation, on your phone instead of sending the content to a server. The app may still need the network for other tasks, so check each feature separately.

Four questions to ask about any app

Use these questions before you trust an app with personal content:

1. Does the app need an account? If yes, your content may live on a server.
2. Where is the content stored? Look for words such as "stored on your device" or "not uploaded".
3. What leaves the device? Look for search text, locations, identifiers or files sent to a service.
4. Which third parties are named? An ad network, an analytics tool or a payment provider each has its own privacy policy.

Read the privacy policy and the store listing. If they disagree, trust the policy and ask the developer.

How our apps handle data

Each app collects different things, so each has its own facts. The table summarizes them.

Calm PDF converts, merges, compresses and extracts text from documents on the device. You can read more on the Calm PDF page.

Percent & Finance Calc Pro runs all its calculations on the device. Your history and saved results stay on the phone. You can read more on the Percent & Finance Calc Pro page.

Notivation keeps your notes, decisions and tasks in its own container. We cannot read them because we do not receive them. You can read more on the Notivation page.

Honest exceptions

Privacy-first does not mean no network at all. Some features need it, and a good privacy policy says so.

MyCookNote searches recipe sites, cookbooks and food blogs online. When you search, only the search text is sent to those sources. No name, account or location is sent with it. Your saved recipes, meal plans and shopping lists stay on the device. See the MyCookNote page for the full details.

Clash Palette keeps progress on the device, but it shows ads to players without Premium. Google AdMob processes ad data under its own policy. Premium removes all ads. See the Clash Palette page for the details.

Islam Guide Pro uses your location to calculate prayer times and the qibla direction. Your bookmarks, fasting log and dhikr records stay on the device.

How to check a claim yourself

You do not need to trust a marketing line. Try these simple checks:

• Read the privacy label in the App Store and the privacy policy. Look for named third parties.
• Turn on Airplane Mode and use the main feature. If the feature still works, it does not need a server for that task.
• Check the permissions in iOS Settings. An app that asks for your camera or contacts should explain why.
• Look for an account screen. If there is no sign-up, there is no server account to hold your content.
• Check whether the app has a clear answer about backups, such as iCloud or device backups under Apple's terms.

None of these checks needs special tools. Together, they show what an app does and what it does not do.

Why we build this way

We build apps that keep content on the device wherever the task allows. We name every network use in the privacy text, and we avoid analytics and advertising where the app does not need them. When a feature needs a network service, we say which service, what it receives and why.

You can see the full set of our apps on the apps page.

Frequently asked questions

Does an on-device app work without internet?

Many core features do. Check each app's features, because a feature such as online search or ads needs a connection.

If my data stays on my phone, is it backed up?

Only if you turn on backups. iCloud or device backups may include an app's local data under Apple's terms. Check the app's privacy policy for details.

What is the difference between on-device and end-to-end encryption?

On-device means the data stays on your phone and the app does not upload it. End-to-end encryption means data is encrypted before it leaves a device. The two can work together, but they are not the same thing.

How do I know a privacy claim is true?

Read the privacy label, the policy and the permissions, then test the main feature offline. Compare what you see with the claim, and contact the developer with any question.