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Which kind of phone privacy do you need?
Start with the person or situation you want to protect against. Someone who can pick up an unlocked phone presents a different risk from someone glancing at the screen from beside you. Choose the layer that matches the risk rather than treating every feature as an interchangeable “phone lock.”
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| Layer | What it helps with | Important limit |
|---|---|---|
| Device screen lock | Restricts access to the phone itself. | A strong PIN or password remains important even when biometrics are enabled. |
| App lock | Requires authentication to open selected apps. | Availability and what information is concealed vary by platform. |
| Hidden app or private space | Reduces casual visibility or provides a separate app space. | Hiding does not guarantee that an app or its use is undiscoverable; separation and backup behavior have limits. |
| Privacy screen protector | Limits viewing from side angles. | It does not authenticate users, and it can affect display quality or touch responsiveness. |
How do I lock an app on iPhone?
On iPhone, the built-in app lock uses Face ID, Touch ID, or the device passcode. Apple’s iOS 27 guide describes locking or hiding supported apps: open the app’s options and choose the available lock or hide action. The precise choices depend on the app and iOS version. See Apple’s iPhone guide to locking or hiding an app.
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#1 Best Overall
- [2 Pack] This product includes 2 pack privacy screen protectors.WORKS FOR iPhone 17e/16e/14/iPhone 13/13 Pro 6.1 Inch tempered glass screen protector.Featuring maximum protection from scratches, scrapes, and bumps.[Not for iPhone 16 6.1 inch, iPhone 13 mini 5.4 inch, iPhone 13 Pro Max/iPhone 14 Pro Max/iPhone 14 Plus 6.7 inch, iPhone 14 Pro 6.1 inch]
- Specialty: to enhance compatibility with most cases, the Tempered glass does not cover the entire screen. HD ultra-clear rounded glass for iPhone 17e/16e/14/iPhone 13/13 Pro is 99.99% touch-screen accurate.
- 99.99% High-definition clear hydrophobic and oleophobic screen coating protects against sweat and oil residue from fingerprints.
- High Privacy: Keeps your personal, private, and sensitive information hidden from strangers,screen is only visible to persons directly in front of screen.Good choose when you are in the bus,elevator,metro or other public occasions.(Note: Due to this privacy cover will darken the image to prevent the peeking eyes near you, you might need to turn your device display brightness up a bit when use it.)
- Online video installation instruction: Easiest Installation - removing dust and aligning it properly before actual installation,enjoy your screen as if it wasn't there.
What app locking conceals on iPhone
Apple says information from locked apps is excluded from some other locations, including notification previews, search, Siri suggestions, and call history. That reduces several casual ways of seeing app activity, but it should not be read as a promise that every trace, backup, or copy of information is erased.
The lock or hidden status applies on that iPhone and does not sync with iCloud. Treat it as a setting on the particular device, not as an account-wide privacy control.
Rank #2
- Perfect Fit for iPhone 17 Pro Max：Engineered exclusively for iPhone 17 Pro Max with seamless edge-to-edge coverage, ensuring precise alignment and reliable full-screen protection.
- Advanced Privacy Protection：Features a 28° privacy filter with smooth 2.5D curved edges, preventing side glances in public. Your screen remains visible only to you—ideal for commuting, traveling, and crowded environments.
- Effortless Installation：Equipped with an auto dust-elimination tool that delivers a fast, accurate, and bubble-free application, keeping your screen perfectly clear with minimal effort.
- Military-Grade Protection：Made of nano-reinforced 9H tempered glass, SGS certified. Provides 5X stronger scratch resistance and proven durability, withstanding thousands of pressure and impact tests.
- Smudge & Fingerprint Resistant：Hydrophobic and oleophobic coating repels fingerprints, sweat, and oil—ensuring your screen stays clean, clear, and smooth to the touch.
How does Android Private Space work?
Private Space is a separate space for apps on eligible devices running Android 15 or later. It can use a separate lock and can be hidden while locked. Device compatibility matters: a manufacturer or administrator may disable the feature. Google’s Private Space help page explains setup and availability.
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Apps in Private Space are not simply made invisible copies of apps in the main space. Google says app data is not moved from the main space, so existing data there does not automatically become private by placing or installing an app in Private Space. Consider where the app is installed and where its data is stored.
Rank #3
- [3 Pack] This product includes 3 pack privacy screen protectors.WORKS FOR iPhone 16/iPhone 15/iPhone 15 Pro 6.1 Inch tempered glass screen protector. Due to the rounded edge design of the iPhone 16/iPhone 15/iPhone 15 Pro and to enhance compatibility with most cases,the tempered glass screen protectors will be slightly smaller than the phone screen.[Not for iPhone 16e 6.1 inch, iPhone 15 Plus/iPhone 15 Pro Max/iPhone 16 Plus 6.7 inch,iPhone 16 Pro 6.3 inch,iPhone 16 Pro Max 6.9 inch]
- Specialty: HD rounded glass for iPhone 16/iPhone 15/iPhone 15 Pro 6.1 Inch is 99.99% touch-screen accurate.
- 99.99% High-definition hydrophobic and oleophobic screen coating protects against sweat and oil residue from fingerprints. Featuring maximum protection from scratches, scrapes, and bumps.
- High Privacy: Keeps your personal, private, and sensitive information hidden from strangers,screen is only visible to persons directly in front of screen.Good choose when you are in the bus,elevator,metro or other public occasions.(Note: Due to this privacy cover will darken the image to prevent the peeking eyes near you, you might need to turn your device display brightness up a bit when use it.)
- Online video installation instruction: Easiest Installation - removing dust and aligning it properly before actual installation,enjoy your screen as if it wasn't there.
Hiding the space while it is locked reduces casual visibility, but Google notes its existence may still be discovered through computer access, device logs, or apps. Private Space is a useful access and visibility boundary, not a guarantee of undetectability.
Does Face ID or another biometric keep an app private?
Biometrics authenticate the person attempting access; they do not replace the device credential. Google recommends using a strong PIN or password even when biometrics are enabled, because an unauthorized person may try to override biometric protections. As Google Android Help puts it: “Even if you use biometrics, you’ll still want a strong password in case an unauthorized individual tries to override your biometric protections.”
Rank #4
- [3+3 Pack] This product includes 3 pack privacy screen protectors and 3 pack camera lens protectors with Installation Frame. Works For iPhone 16 [6.1 inch] tempered glass screen protector and camera lens protector. Featuring maximum protection from scratches, scrapes, and bumps. [Not for iPhone 16e 6.1 inch, iPhone 16 Pro 6.3 inch, iPhone 16 Pro Max 6.9 inch, iPhone 16 Plus 6.7 inch]
- Night shooting function: specially designed iPhone 16 6.1 Inch camera lens protective film. The camera lens protector adopts the new technology of "seamless" integration of augmented reality, with light transmittance and night shooting function, without the need to design the flash hole position, when the flash is turned on at night, the original quality of photos and videos can be restored.
- High Privacy: Keeps your personal, private, and sensitive information hidden from strangers, screen is only visible to persons directly in front of screen. Good choose when you are in the bus,elevator,metro or other public occasions. (Note: Due to this privacy cover will darken the image to prevent the peeking eyes near you, you might need to turn your device display brightness up a bit when use it.)
- Easiest Installation - Please watch our installation video tutorial before installation. Removing dust and aligning it properly with the help of the included installation frame before actual installation, enjoy your screen as if it wasn't there.
- 99.99% High-definition clear hydrophobic and oleophobic screen coating protects against sweat and oil residue from fingerprints, and enhance the visibility of the screen.
For apps using Apple’s biometric authentication, Apple says the app receives only a success-or-failure result from Face ID or Touch ID, not the biometric data itself. That describes what the app receives during authentication; it does not mean the app-lock feature hides every other record of app use. See Apple Platform Security’s explanation of Face ID and Touch ID and Google’s Android security guidance.
Can someone see my screen from the side?
A privacy screen protector is a physical aid for off-angle viewing. It can make it harder for someone beside you to read the display, but it does not lock the phone or app and does not protect a screen that the viewer can see head-on. Choose one made for your exact phone model: size and fit are not universal.
Best Value
- [Industry-Leading 100% Anti-Spy Privacy Protection] Designed for iPhone 17 Pro Max. Larger iPhone screens are easier for others to glance at, so UltraGlass uses patented, SEGI-certified 25° Blackout-3 optical technology to help block side views and keep emails, banking apps, and private content visible only to you—while keeping the front view HD-clear and comfortable through hours of scrolling and streaming.
- [Unbreakable TOP 9H+ Glass, the Excellent 2nd Screen for Your iPhone] Boasting unparalleled shatter resistance and durability. And the core excellence is the top 9H+ tempered glass material, which is widely applied in aerospace and military fields for its ① Shatter-proof ② Scratch & Wear Resistance ③ Durability that is 7-8 times higher than other materials. Thus, UltraGlass builds a second tough screen for your iPhone 17 Pro Max.
- [Industry Top Military-Grade Shatterproof] Authorized by the International Military Standard with 50+ rigorous engineering tests of 220 lbs impact, 8,000+ drop tests, 25,000+ scratch tests, etc., its strength, toughness and durability perform NO.1 among all glass. By especially breaking the industry's record with a 12ft drop, the iPhone 17 Pro Max screen protector is ensured to be unbreakable from its surface to every edge and corner.
- [Invisible Armor, 1:1 Full Covers the iPhone's Screen] Mimicking the iPhone's original screen design, it uses a 1:1 3D curved reinforced black edge that wraps around every curve — case friendly — while securing even the most vulnerable edges. Seamlessly blending with the iPhone 17 ProMax screen, it's virtually invisible and feels like the original screen while offering enhanced full-screen protection.
- [0 Bubbles + 0 Dust + 0 Misaligned =100% Successful Installation] Includes everything you need with pioneering automatic positioning, dust removal, and absorption technology, making the installation just effortlessly easy in seconds. No bubbles, no troubles—transforming beginners into experts!
Traditional privacy filters can affect brightness, clarity, or touch responsiveness. Those trade-offs vary by product. For example, Belkin’s support information applies to specified iPhone models and should not be taken as a compatibility list for other phones.
Samsung has described a Privacy Display for the Galaxy S26 Ultra, a manufacturer-specific feature rather than evidence that every phone has built-in off-angle protection. See Samsung Mobile Press’s Galaxy S26 Ultra announcement.
What should I do when temporarily handing over my phone?
Android screen pinning can keep the device on one selected app until it is unpinned with the PIN, pattern, or password. It can help when someone needs to use one app briefly, but it is not an app-hiding feature and does not conceal content visible on the active screen. Google outlines the option in its Android security guidance.
Quick Recap
Choose the layer that matches the exposure
- To restrict access to the whole phone: use a strong device PIN or password, with biometrics as a convenient authentication method.
- To add a prompt before selected apps open: use the platform’s app-lock feature where supported.
- To reduce casual visibility or separate apps: consider iPhone’s supported hidden apps or Android Private Space, while accounting for their platform-specific limits.
- To reduce side-angle viewing: consider a privacy screen protector made for your exact phone model, accepting possible display or touch trade-offs.
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