Millions of users are using Facebook and WhatsApp on their smart phone. WhatsApp is one of the favorite messaging platforms, handling tons of photos, videos and text messages per day between smartphone users. Some of these messages might be private and personal that need to be protected from other intruders. Unfortunately none of these Apps offering any built in password protection to prevent snoopers peeping into the content of these apps.
Google Play store is offering a bunch of apps to protect your Android device from these intruders. These apps can protect your messaging apps by adding another layer of security to offer a password protection to WhatsApp or Facebook apps. You can choose the type of passwords such as PIN, Text Password or even your fingerprint. Here is the list of best apps to lock WhatsApp and Facebook app on Android.
Security Master – Antivirus, VPN, AppLock, Booster
Key features: Android Apps Lock | Free VPN and proxy | Security Master Antivirus | Junk Files Clean | Battery Saver | Download from PlayStore
CM Security is one of the best security apps to lock WhatsApp. In addition to WhatsApp Lock, Android CM Security app offers to lock your Android apps such as WhatsApp, Contacts and Facebook Messenger from the snoopers.
Avast Mobile Security & Antivirus
Key features: App Locker | Antivirus Engine | Call Blocker | Anti-Theft | Junk Cleaner | Web Shield | WiFi Scanner | Download from PlayStore
Avast app is offering App Lock feature that can use to lock WhatsApp. Avast Mobile Security with free antivirus for Android scans and secures against infected files, unwanted privacy phishing, malware, and spyware. This Android Avast app scans malicious viruses such as trojans and also protect devices against loss or theft. This app can secure your phone and tablet with our top-rated free mobile security app featuring both antivirus and anti-theft protection.
This app offer security tools like virus and malware scanner, trojan removal for infected files, protector, network meter, app manager, app lock, and even firewall give you total control for staying clean.
AppLock
Key features: Fingerprint lock | Intruder selfie | Facebook Lock | Whatsapp Lock and other apps | Hide pictures and videos | Time Lock | Location Lock | Power Saving Mode | Download from PlayStore
AppLock is another dedicated app to lock apps like Facebook, WhatsApp and also capable to lock SMS, Contacts, Gmail, Gallery, Market, Settings, Calls and any app you choose, with abundant options, protecting your privacy. 
AppLock can hide pictures and videos and empowers you to control photo and video access. Selected pictures vanish from your photo gallery, and stay locked behind an easy-to-use PIN pad. With AppLock, only you can see your hidden pictures. Privacy made easy. This app can also offer you intruder alert, that can protect your device using from unknown people.
Also read: How to Disable Face Recognition on Facebook?
Private Zone – AppLock & Vault
Key features: Lock up Facebook, WhatsApp, etc. |Â screen lock | Hide pictures& videos | Private browsing | Anti-theft | Clear Junk files |Â Download from PlayStore
Use Private Zone app to lock up Facebook, WhatsApp, Snapchat, Messenger, Gallery and other Android apps. Private Zone app protects Android from private information leakage, with strong AppLock to Lock up Apps, convenient privacy scan to locate loophole, Safe Box to hide Private Photo & Video, WiFi Security to Secure Network Safety, etc.
With Private Zone, you lock private SMS and call, lock gallery and Facebook, hide private photos & Video and also lock up your Facebook, WhatsApp, Messenger and other important apps which may leak your privacy.
CM Locker-AppLock, Lock screen
Key features:Â Confidential DataLock | Android App Lock | Intruder selfie | Anti-theft protection | Weather forecast | Camera Shortcut |Â Download from PlayStore
CM Locker offers confidential data locker to protect your Android phone. This Locker app can protect your Android and Take a photo of someone who entered the wrong password twice who wants to snoop on your WhatsApp or Facebook. 
You can lock contacts, lock apps like WhatsApp, Facebook Messenger from prying eyes and nosy friends. This app lets you lock settings to prevent your children from buying unwanted apps/games and phone settings.
AppLock – Fingerprint
Key features: App Locker | Fingerprint protection | App Protector | Intruder protection | Fake Lock | Remote Lock | Lock Calls | Download from PlayStore
Those who are looking to lock WhatsApp and Facebook from intruder’s eyes, App lock is one of the best apps for Android phones. This Android Lock App will lock and protect apps using password or pattern.
With AppLock, you can lock any apps (SNS, Game, Photos, Videos, SMS), detect and takes a picture of the Intruder, lock apps using a Fake Forced Close pop-up, lock apps using multiple passwords, lock your phone using remote control, etc.
Perfect AppLock (App Protector)
Key features:Â Protect WhatsApp, Facebook& other App with PIN, Pattern or Gesture |Â Lock WiFi, 3G data, Bluetooth |Â Lock Outgoing Calls | Lock Incoming Calls |Â Fake Popup | AppLock Remotely |Â Download from PlayStore
Perfect AppLock lets you protect any applications including Facebook and WhatsApp with PIN, Pattern or Gesture. You can lock WhatsApp, Facebook, Twitter, Skype, SMS, Email, Gallery, Camera, USB connection, Settings and any apps you choose.
This app takes a photo of the attacker with built-in camera After 3rd failed password attempt. In addition to this, this app can lock outgoing and incoming calls, lock 3G, WiFi and Bluetooth. Remote lock feature let you lock your phone while you are away from the phone.
Smart AppLock (App Protect)
Key features: Lightweight | Lock Apps |Â Lock Incoming Calls | Lock Wi-Fi toggle & Bluetooth toggle | Lock settings | Download from PlayStore
Smart AppLock is a tool to lock apps you like, protect you from privacy leak. With AppLock, you are able to lock apps containing privacy content, such as photos, videos(Gallery), short messages (SMS or MMS) and call logs, lock SNS apps such as Facebook, Whatsapp, Twitter.
This app can lock incoming calls, lock Wi-Fi toggle & Bluetooth toggle, lock system settings, install/uninstall apps to keep the phone away from being messed up by others or kids and lock games and markets to prevent your kids from addicting in games or purchasing in markets without your knowing.
These WhatsApp lock apps also provide some extra benefits to the user. Most of these apps can take a selfie of the intruder without knowing him when he tries and fails these Apps password more than two times. This is a nice and essential feature that let the Android owner to identify his friends and family who made the attempt to open private information and apps.
Since the excessive use of these messaging apps and social media apps, it is recommended to install at least one of the apps to protect your private information from your friends, family and other forms of intruding attempts.
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This blog post is really helpful.
Thanks for providing the information to protect my whatsapp messages.
Hi,
I only use Huawei phones/tablets and only some of the app lock apps work with Huawei’s phone manager, especially its “block apps from running in the background” feature.
The only App Lock apps working on Huawei I found so far are Smart App Lock by SpSoft and Privacy Knight by Taobao.
Here’s my experiences (especially with using Huawei’s App Lock alongside with an extra App Lock app):
Smart App Lock
Only works fine (on Huawei G8, Android 6.0.1, EMUI 4.0 3) as long as you do not(!) install the Helper app that’s supposed to prevent it from being force stopped and you allow it to run in the background with Huawei’s phone manager! If the helper app is installed you can force stop Smart App Lock and it wont restart after a reboot or through its internal restart schedule. But: Without the helper app you can even use it alongside Huawei’s own phone manager app lock for locking critical apps with two different PINs or with fingerprint plus PIN!
Privacy Knight
If you don’t allow the app to run in the background (Huawei G8, Android 6.0.1, EMUI 4.0.3), it sometimes works and sometimes it just starts up locked apps without asking for the code… Behaviour like that is dangerous for a security app. But at least it works fine once you allow it to run in the background – just lock Huawei’s phone manager that controls permissions to run in the background and you’re fine. Unfortunately you cannot use the Huawei phone manager’s app lock alongside Privacy Knight since they both “battle” for being on top for entering the PIN or using the fingerprint.
So: An extra App Lock app alongside with Huawei’s app lock only works with Smart App Lock from SpSoft (for me and so far). Using a second App Lock app you can enable basic security with quick fingerprint unlock via Huawei’s phone manager and add extra security to critical apps with a longer PIN via Smart App Lock. Snart App lock will always cover the “use fingerprint screen” but apps you only fingerprint locked with Huawei’s app lock, can still be unlocked just with a fingerprint. On the other hand – even if you enter Smart App Lock’s PIN when requested, the Huawei app lock fingerprint will still be required by those apps. This is like an undocumented stealth feature!
H.