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Use different protections for different privacy risks: a strong device passcode to secure the phone, an app lock or private space to restrict access to selected apps, and a privacy screen protector to reduce side-angle viewing. None of these controls erases every notification, copy, backup, or trace of app use.
Which kind of privacy protection do you need?
| Layer | What it helps with | Important limit |
|---|---|---|
| Device screen lock | Restricts access to the phone itself. | Use a strong PIN or password even when biometrics are enabled. |
| App lock | Requires authentication before opening selected apps. | Which apps can be locked, and what information is concealed elsewhere, depend on the platform. |
| Hidden app or private space | Reduces casual visibility or separates access to apps. | Hiding an app does not guarantee that its existence or use is undiscoverable. |
| Privacy screen protector | Limits viewing from off-angle positions. | Must fit the exact phone model and may affect display quality or touch. |
How do I lock an app on iPhone?
On an iPhone using iOS 27, touch and hold a supported app, then choose the option to require Face ID, Touch ID, or the device passcode. Apple also provides a hide option for supported apps: a hidden app moves into the Hidden folder in the App Library. See Apple’s iPhone guide to locking or hiding apps.
Apple says information from locked apps is excluded from some other places, including notification previews, search, Siri suggestions, and call history. That does not mean every trace or copy is removed. The lock or hidden status applies on that iPhone and does not sync with iCloud, so do not assume another device inherits the same restriction.
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1Clear out junk files and repair common Windows errors2Scan for outdated or missing drivers - takes under a minute3Repair Windows errors before they cause bigger problemsHow does Android Private Space work?
On eligible devices running Android 15 or later, Private Space provides a separate area for apps and can use a separate lock. You can also hide the space while it is locked. Availability can depend on compatible hardware, and a manufacturer or administrator may disable it. Follow Google’s Android Private Space instructions for the device’s setup and controls.
#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.
Private Space is not a way to move an existing app’s data out of the main space: Google says app data is not moved from the main space. Nor is the space guaranteed to be undiscoverable. Google notes that its existence may still be found through computer access, device logs, or apps. Treat it as a barrier to casual access, not as a guarantee of secrecy or a complete data-separation and backup solution.
Does Face ID or another biometric make an app private?
Biometrics authenticate you when a device or app asks for verification; they do not replace the underlying device credential. Google recommends using a strong PIN or password even when biometrics are enabled, noting: “Even if you use biometrics, you’ll still want a strong password in case an unauthorized individual tries to override your biometric protections.” Google’s Android guidance also covers biometrics and screen pinning.
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.
For Apple devices, an app receives only the success or failure result from Face ID or Touch ID, not the biometric data itself, according to Apple Platform Security. Authentication can keep someone from opening a protected app, but it does not protect content already visible on an unlocked screen or remove information retained in other places.
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A privacy screen protector is a physical aid that narrows what people can see from off-angle positions. It does not lock apps or stop someone looking directly at the screen. Samsung describes a privacy display for the Galaxy S26 Ultra at Samsung Mobile Press; traditional aftermarket filters are a separate accessory category.
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.
Choose a protector made for the exact phone model. Traditional filters can reduce brightness or clarity and may affect touch responsiveness. Compatibility and trade-offs vary: for example, Belkin’s support information applies to specified iPhone models, not every phone. Check model fit, viewing direction, display clarity, touch performance, and installation requirements before buying.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What should I use when handing someone my phone?
On Android, screen pinning can keep the device on one selected app until it is unpinned using the PIN, pattern, or password. It can be useful when temporarily handing over a phone, but it is not an app-hiding feature and does not protect content visible in the active app from the person holding the phone. Use it only when the selected screen is appropriate for them to see.
Quick Recap
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 NO.1 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!
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.
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