How to lock apps with a password on iPhone
Apple does not give third-party apps permission to sit in front of another app and demand a password before it opens. That is the reason every "app lock" app in the App Store uses Screen Time as the actual enforcement layer and adds a UI wrapper on top. Knowing that, you can skip the wrapper and go straight to Screen Time.
Step 1 -- Set an App Limit. Go to Settings > Screen Time > App Limits > Add Limit. Select the specific app (expand a category to pick individual apps rather than the whole group). Set the daily time to 1 minute. This is effectively zero: the limit fires within moments of opening the app. Tap Add.
Step 2 -- Add a Screen Time passcode. Go to Settings > Screen Time > Use Screen Time Passcode. Set a 4-digit code that is different from your device unlock code. Apple prompts for an Apple ID to enable recovery -- provide it, because losing this passcode without a recovery method locks you out of Screen Time settings permanently. This passcode is now the "password" that guards the app. Without it, bypassing the App Limit is two taps. With it (and without knowing it), bypassing requires calling whoever holds the code.
Step 3 (optional) -- Give the passcode to someone else. If the goal is to lock yourself out rather than control a child's device, ask a partner, sibling, or trusted friend to set the passcode without telling you. They become the only person who can override the limit. This is a genuine commitment device: the app is now behind a password you do not hold.
Note: This approach locks the app by daily usage, not on each open. The effect is identical once the limit fires, but the mechanism is a time budget, not a per-open password prompt. For most users who want to reduce their time on an app, this is the right design. For users who want a literal password on every open (e.g., to prevent another person from accessing Messages), see the Guided Access section below.
The strongest version of apps password lock on iPhone is: App Limit set to 1 min/day + Screen Time passcode held by someone else + Content Restrictions blocking app installation so the app cannot be deleted and re-added fresh (which would reset the limit). See the full walkthrough in how to block apps on iPhone.
How to lock text messages on iPhone
There are two different reasons people search for this. The first is wanting to stop themselves from messaging during certain hours (productivity or sleep). The second is wanting to prevent someone else -- a child, a roommate picking up the phone -- from reading their Messages. Each needs a different approach.
To restrict who your child can contact: Settings > Screen Time > Communication Limits. You can restrict contacts to Contacts Only (no strangers), allow only a specific contact list, and separately restrict who can reach them during Downtime. This applies to Messages, FaceTime, and phone calls in one setting.
To stop yourself from using Messages past a certain hour: Settings > Screen Time > Downtime > Schedule. Set Downtime for your off-hours (e.g., 10 PM to 7 AM). Then go to Always Allowed and remove Messages from the list. Messages is in Always Allowed by default; removing it means Downtime blocks it along with every other app. With a Screen Time passcode held by someone else, this is genuinely locked.
To temporarily lock Messages from someone who might pick up your phone: Use Guided Access. Open Messages, then triple-click the side button (or Home button on older iPhones). Guided Access locks the device to that single app in the current state. To exit, triple-click again and enter your Guided Access passcode. Settings > Accessibility > Guided Access is where you enable it and set the passcode. This is a full device lock to a single app, not a per-app password system, but it is the closest iOS gets to one natively.
Tip: Guided Access does not require Face ID or Touch ID to enter the app -- it locks the phone into the app after it is already open. If you want Messages locked at-rest (closed), the App Limit to 1 min/day plus Screen Time passcode method is the right approach for preventing casual snooping.
There is no native "passcode before opening Messages" screen on iPhone, and Apple has consistently declined to add one. The combination of device Face ID/Touch ID plus Screen Time App Limits is the system Apple expects users to rely on. Third-party "app lock" apps in the App Store cannot actually create an authentication prompt in front of Messages -- they can only log time, set reminders, or wrap Screen Time. The enforcement muscle is always Screen Time.
How to lock my phone on iPhone
"Lock my phone" means different things depending on context: locking the screen after inactivity, requiring Face ID on every wake, or locking yourself out of specific apps behaviorally. iPhone covers all three natively.
Auto-lock and require passcode: Settings > Display & Brightness > Auto-Lock. Set this to 30 seconds for maximum security -- the screen locks 30 seconds after your last touch. Then Settings > Face ID & Passcode (or Touch ID & Passcode) > Require Passcode > Immediately. This means Face ID or your passcode is required the instant the screen locks, with no grace period.
Lock immediately via button: Press the side button once. The screen goes dark and locks. To add friction to waking: Settings > Accessibility > Guided Access (then triple-click) or Settings > Face ID & Passcode > Attention Aware Features (off) to prevent the phone from staying unlocked while you are looking at it.
Behavioral lock -- lock yourself out of the phone as a whole: Screen Time > Downtime > set your schedule > with a Screen Time passcode held by someone else. During Downtime the phone is reduced to Always Allowed apps only (typically Phone, Messages, Maps, FaceTime). This is the iOS equivalent of a behavioral lockout.
ScreenFine adds a different layer here: rather than locking access to the whole phone, it locks access after you have spent too much time on it. When you cross your daily limit, apps are shielded via the iOS FamilyControls framework. The unlock is not a passcode -- it is 25 pushups or 1,000 steps, verified. This is addressed in more detail in the consequence section at the bottom of this page.
App lock pattern: what it is and why it does not exist on iPhone
On Android -- Samsung, Google Pixel, OnePlus, and others -- many manufacturers ship a system-level "app lock" feature that prompts for a pattern, PIN, or fingerprint before any individual app opens. Samsung's Secure Folder and the built-in Galaxy app lock use this. Because Android allows privileged system apps to intercept app launches, a drawn pattern can guard any installed app.
iPhone's sandbox model forbids this. Third-party apps run in isolated containers and cannot intercept another app's launch event. There is no App Store app that can draw a pattern and actually prevent Messages or Instagram from opening if the user taps "cancel" or kills the locker app. Any app that claims otherwise is either wrapping Screen Time (which does the real enforcement) or adding friction the user can circumvent in two steps.
The iOS equivalent of an app lock pattern is the Screen Time passcode. It is a 4-digit PIN, not a drawn pattern, but it serves the same function: access to the guarded app is blocked until the correct code is entered. The difference is that the Screen Time passcode guards a time budget (not a per-open prompt), and it is controlled in the Settings layer rather than as a standalone app.
For the goal of "stop myself from opening this app": the Screen Time approach is arguably better than a pattern lock, because you cannot memorize your way past it in a weak moment the way you can with your own pattern. A Screen Time passcode held by someone else is the closest functional analog to a strong Android app lock pattern.
If you are switching from Android to iPhone and miss the pattern lock, the setup described in the first section of this guide -- App Limit + Screen Time passcode held by someone else -- reproduces the security goal of a pattern lock with a different mechanism. For more detail, see how to set screen time limits on iPhone.
Lock screen pattern apps: third-party options and their real limitations
Search "lock screen pattern app" in the App Store and you will find dozens of results. Most of them fall into two categories: visual customization apps (lock screen widgets, wallpaper tools, theme apps) and Screen Time wrappers with a pattern-style PIN UI. Neither category can actually enforce a security pattern the way Android does.
Visual lock screen apps let you customize what appears on your lock screen -- widgets, fonts, complications, photo layouts. They do not add authentication. Your device's Face ID/Touch ID passcode is still the only gate into the phone. These apps are cosmetic.
Screen Time wrapper apps present a pattern or PIN UI, but the actual enforcement is done by the iOS Screen Time API they call in the background. The app sets an App Limit via ScreenTime framework and brands the lock screen with a pattern interface. If you bypass their UI, you are back to the native Screen Time prompt, which is a 4-digit PIN (the Screen Time passcode) set by you. The pattern is cosmetic; the PIN is real.
The practical upshot: if your goal is a pattern lock for security against someone else picking up your phone, the lock screen pattern apps in the App Store will not deliver it. Your best option is a strong device passcode plus biometrics.
If your goal is self-control -- locking yourself out of certain apps -- the Screen Time passcode (4-digit PIN, held by someone else) is the strongest native option, and a commitment-device app like ScreenFine adds a consequence layer on top. See the full app-blocking guide for the complete method ladder.
Good Lock: Samsung-only, not available on iPhone
Good Lock is a first-party Samsung app that extends One UI's customization layer. It installs from the Galaxy Store (not the Google Play Store) and is only supported on Samsung Galaxy devices running One UI 6 or later. It is not available on iPhone. It is not available on non-Samsung Android. It does not have an App Store listing.
The confusion usually comes from two sources. First, people switching from a Samsung Galaxy to an iPhone search for the same tool by name. Second, people see reviews of Good Lock's modules -- LockStar (lock screen editing), QuickStar (Quick Settings), MultiStar (multitasking) -- and want the same level of system-layer customization on iOS.
The iOS equivalents are more limited because Apple's architecture does not expose the same system hooks to customization tools:
- Lock screen customization: Settings > Wallpaper > Customize Lock Screen. You can add widgets, change the clock font and color, and add lock screen complications. This is built in to iOS 17 and 18 -- no extra app needed.
- Focus Modes: Settings > Focus. This is the iOS analog to Good Lock's productivity modules. You can create custom Focus states (Work, Sleep, Reading) that show different home screen pages, filter notifications to specific contacts and apps, and display a custom lock screen. Focus Automation triggers them on schedule or location. This covers a large portion of what Samsung users use Good Lock for.
- Control Center customization: Settings > Control Center. Add, remove, and reorder tiles. Less flexible than Samsung's QuickStar module but covers the basics.
- Multitasking / app pairing: Stage Manager on iPad, not available on iPhone in the same form. On iPhone, no native split-screen equivalent to Samsung's Multi Window or Good Lock's MultiStar module exists.
If what you valued in Good Lock was the app lock feature specifically (requiring a pattern before an app opens), the Screen Time passcode is the closest iPhone equivalent. The mechanism is different but the security goal -- an additional authentication step before accessing a specific app -- is achievable via the methods in this guide.
When a password is not enough: the consequence layer
Every method covered above -- App Limits, Screen Time passcodes, Downtime, pattern lock equivalents -- is a friction mechanism. Friction works until the user is determined enough to push through it. The "Ignore Limit For Today" button on App Limits takes two taps. If you know the Screen Time passcode, bypassing takes five seconds. Even a passcode held by someone else fails if you call them and ask for it in a compelling-enough moment.
The research distinction here is between a soft commitment (friction that relies on willpower in the moment) and a hard commitment device (a pre-committed cost that exists regardless of in-the-moment willpower). Passing your Screen Time passcode to a partner moves you from soft to hard -- you cannot bypass it alone. Adding a verified exercise cost moves the consequence from social (shame of asking) to physical (the pushups actually happen).
ScreenFine is built around this distinction. When you cross your daily screen time limit, iOS's FamilyControls framework shields the over-limit apps. The shield persists until you log a redemption: 25 camera-verified pushups, 1,000 steps via HealthKit, 10 mindful minutes, or 25 squats. The honor button is also always available as a manual exit. The flat subscription is $1 per week -- the cost is the accountability structure, not per-overage billing.
This is not a replacement for Screen Time -- it is a layer on top of it. The App Limit sets your daily budget. ScreenFine charges the consequence when you cross it. Used together, you get a real lock that a password alone cannot reproduce. See how it compares to native Screen Time at how to set screen time limits on iPhone, and the full guide to blocking individual apps at how to block apps on iPhone.
Quick reference: what you searched for and what to do on iPhone
- Apps password lock: Screen Time App Limits (1 min/day) + Screen Time passcode. Strongest: passcode held by someone else.
- Lock text messages iPhone: Communication Limits for contact restrictions; remove Messages from Always Allowed + Downtime for time-of-day locks; Guided Access for temporary per-session lock.
- Lock my phone: Auto-Lock to 30 seconds + Require Passcode Immediately. Behavioral: Screen Time Downtime + passcode held externally.
- App lock pattern: Not possible on iOS as a per-open pattern. Closest equivalent: Screen Time passcode (4-digit PIN) guarding an App Limit. For self-lock: give passcode to someone else.
- Lock screen pattern app: Third-party apps wrap Screen Time; the actual enforcement is Screen Time. No App Store app can intercept another app's launch at the OS level.
- Good Lock application: Samsung-only, not on iPhone. Use iOS Focus Modes (productivity), Lock Screen customization (cosmetic), and Screen Time passcode (app security).