Lock a Single App on iPhone — Add One Step Before It Opens

Taking an icon off your first Home Screen page helps, but search still finds it. For the one or two apps that keep coming back, placement is not enough — you need something that sits in the way of opening them.

iPhone can require authentication for a single app, which turns opening it into a deliberate act instead of a reflex. This post covers only that: the one step before the app opens. For moving icons out of reach, see decluttering your Home Screen. For cutting off an app by the clock, see setting app time limits on iPhone.

Locking and hiding are two different settings

Apple’s iPhone User Guide covers both under “Lock or hide an app on iPhone.”

	What happens	The icon
Lock	Face ID, Touch ID or your passcode is required to open the app	Stays on the Home Screen
Hide	The app is removed from the Home Screen, App Library and search results, and moves to a Hidden folder at the bottom of App Library	Disappears

Locking has a side effect worth knowing about. According to the guide, information inside a locked app no longer appears in other places either — CarPlay, notification previews, search, Siri suggestions or your call history. Several routes that let the content reach you without opening the app close at once.

Both settings are per-device. The locked or hidden status does not sync with iCloud, so if you want the same app locked on an iPad, you have to do it again there.

The steps

Following the wording in the user guide:

1. On the Home Screen, touch and hold the app you want to lock until the Quick Actions menu opens
2. Tap Require Face ID (or Touch ID, or Passcode)
3. To lock only, tap Require Face ID. To lock and hide, tap Hide and Require Face ID, authenticate, then tap Hide App

To undo it, touch and hold the icon again, tap Don’t Require Face ID, and authenticate. To see everything you have hidden, go to Settings → Apps → Hidden Apps.

The important detail is that getting through once does not clear the lock. The guide says plainly that opening a locked app does not permanently unlock it, and that the app relocks automatically after you quit it. There is no “authenticate in the morning, free until bedtime” mode.

Some apps cannot be hidden

• Apps that come installed cannot be hidden. Only apps you downloaded separately from the App Store can be
• An app you set as your default web browser cannot be hidden, and neither can an app marketplace (available only in the EU)
• Children under 13 in a Family Sharing group cannot lock or hide apps at all. Anyone aged 13 to 17 can, but a parent or guardian can still see that the app was downloaded and how much time it is used, and can restrict access to it with Screen Time. These ages vary by country or region

Pick one or two apps, not ten

Lock everything and the authentication prompt becomes wallpaper. Decide what you are not locking first, then choose from what is left.

Kind of app	Lock it?	Why
Phone, messaging, maps, payments	No	You need these in a hurry, and a prompt gets in the way
Social and short video	Yes	Too many routes in, from search and from links
News and aggregators	Yes	Updates keep arriving on someone else’s schedule
Games and shopping	Yes, hiding optional	Sessions tend to run long

The selection rule is simple: the app you took off your Home Screen and still found yourself inside. For keeping contact apps usable while limiting the rest, see keeping messaging apps while blocking social media.

What an app lock will not stop

Knowing the limits up front is what keeps the setting in place.

• Notifications still arrive. Previews no longer show the content, but the notification itself comes through. The sound and badge side needs separate handling
• The web version walks straight past it. Lock the app and the browser still opens the same service. See when a blocked app just opens in the browser for how to close that gap
• You get used to it. A field study of a friction-based intervention (Grüning et al., PNAS 2023, 280 participants over six weeks) reported that people closed the app in 36% of the moments the intervention appeared, and that by week six, attempts to open the targeted apps were 37% lower than in week one. Read the other way, more than six in ten attempts went ahead anyway
• You can remove it yourself. A long press and a couple of taps undo the lock, so it is not the right tool for the hours when you genuinely cannot stop

For where built-in settings end and dedicated blockers begin, see Screen Time versus app blockers on iPhone. If you want unlocking to cost more than a tap, using an NFC tag as a physical key covers that approach.

On Android, it is called private space

Google’s Android Help describes private space, available on Android 15 and up, as a separate space on the device where you can hide and organise apps. You create it from Settings → Security & privacy → Private space under “Privacy,” and you can set a separate lock for it.

The help page is also clear about the limits. Private space is unavailable on managed devices and for secondary users, and on devices with more than four users or profiles. It also notes that you may not be able to hide the existence of private space from people who install apps on your phone, from anyone who can connect the device to a computer including via Android Debug Bridge, from other apps that can detect its usage, or from device logs. For the time-based side of Android, see what Digital Wellbeing can and cannot do.

A one-week checklist

• Write down the one or two apps you still opened after decluttering
• Turn on Require Face ID for those apps only
• Leave phone, messaging, maps and payments untouched
• Count the times the prompt appeared and you closed the app instead
• Switch any app whose count stays near zero over to a time limit instead

One number is enough: how often the prompt appeared and you backed out. If it climbs, the extra step is doing its job. If it stays near zero, that is your signal to try a different mechanism.

Sources

• Apple, “Lock or hide an app on iPhone” (iPhone User Guide, iOS 27): https://support.apple.com/guide/iphone/lock-or-hide-an-app-iph00f208d05/ios
• Google, “Hide sensitive apps with private space” (Android Help): https://support.google.com/android/answer/15341885
• Grüning, D. J., Riedel, F., & Lorenz-Spreen, P. “Directing smartphone use through the self-nudge app one sec,” PNAS 120(8): e2213114120 (2023; field study with 280 participants over six weeks; apps closed in 36% of intervention moments, week-six launch attempts 37% lower than week one): https://www.pnas.org/doi/10.1073/pnas.2213114120

This post summarises published research and official help documentation. It is not medical advice or a diagnosis.