With in-app purchases
AppLock is an Android app by DoMobile Lab. It locks apps like Facebook, Whatsapp, Gallery, Messenger, SMS, Contacts, Gmail, Settings, and any app chosen. Other than locking incoming calls, it prevents unauthorized access and guard privacy.
Smart AppLock (App Protect) is a tool used to lock mobile phone features in order to protect them from privacy leaks. It can lock privacy, apps, incoming calls, settings, and markets. It can also disguise lock screens to prevent break-ins.
with in-app purchases
Private Zone allows users to lock up their Facebook, WhatsApp, Snapchat, Messenger, gallery and other important apps which may leak their privacy. The privacy and hider app is developed by Leomaster for Android devices.
Hexlock is an app lock that will protect your privacy and secure your apps with up to six unique profiles to cover every situation.
Hexlock App Lock & Photo Vault
AppLock - Fingerprint is a free AppLocker or App Protector for Android devices developed by SpSoft. It helps in locking and protecting apps using a password, pattern, or fingerprint. It locks Facebook, WhatsApp, gallery app, and more.
AppLock - Fingerprint
WhatsApp Lock is a way to lock WhatsApp, Facebook, WeChat, Kik, Tango, Hangout, SMS etc.
Lock for Whats Messenger
Perfect AppLock lets users protect any applications they want via PIN, Pattern or Gesture. The app can lock the following: Whatsapp, Facebook, Twitter, Skype, SMS, Email, Gallery, Camera, USB connection, Settings, and any other chosen apps.
This app lets you protect most popular messaging and chat applications. You can lock WhatsApp, Facebook and many more by using a PIN. Keep your privacy and maintain secure!
Messenger and Chat Lock
lockIO is a free security app for Android devices featuring Applocker, Photo Vault and Power Off Blocker. With this app you can lock apps with a password, turn off your phone and protect it from thieves, hide photos in your photo vault, and more.
CM AppLock is an app that lets users lock contacts, WhatsApp, and Facebook Messenger from prying eyes and nosy friends. It can also lock your gallery, photos, and files.
*NO LONGER AVAILABLE*
Locker for WhatsApp is an app that allows you to lock and unlock any Whatsapp chat, whether it's group or private, on your phone. You can easily protect all your sensitive information, pictures, and conversations.
Locker for Whats Chat App
Social Password Lock Manager is an application created by Khadija Burhanpur. It is a passcode lock for Whatsapp conversations. it also offers Whatsapp chat wallpapers and background images.
Social Password Lock Manager
with in-app purchases
Add fingerprint security to any app: WhatsApp, iMessage, Facebook & more
Fingerprint Login: PassKey Password & Apps Lock
Paid: $29.99 Varies by plan
Cisdem AppCrypt is software for Mac that securely locks application such as Facebook, Twitter, and many more so as to prevent the user from getting distracted. Moreover, it also locks Photos App with a password.
DID YOU KNOW?
Did you know that WhatsApp was founded by former Yahoo! employees Brian Acton and Jan Koum in 2009? After leaving Yahoo! in 2007, both of them traveled to South America to unwind and play frisbee. They even tried to apply for a job at Facebook but were not successfully hired. Koum then just relied on his $400,000 savings he got from Yahoo! for years. In 2009, Koum purchased an iPhone and thought of a potential app that could be downloaded from Apple App Store. He learned the code all by himself while doing the app. In addition, Koum has taped a note from his co-founder Brian that reads “No Ads! No Games! No Gimmicks!" so that they will only focus on creating a pure messaging experience.
Koum called it "WhatsApp" because it sounds like "what's up" or the phrase we use when we start a conversation with someone. On February 24, 2009, also his birthday, he incorporated WhatsApp Inc. in California. Meanwhile, in 2014, Facebook acquired WhatsApp for $19 billion. Back then, it was the Facebook's largest purchase acquisition. Some people even thought that Facebook's decision to buy WhatsApp is a bad idea, considering its high price. However, in 2017, Facebook CEO announced that WhatsApp already has over 1.5 billion users, and an average of 60 billion messages are being sent each day.