App-Locker

Sometimes it's necessary to "lock" certain apps. E.g. when giving your smartphone to someone else for a call or something else, you probably don't want that person to have full access to everything. For this, the following apps come in handy:

Child protection

2020-05-12

Parental Control Kroha - Screen Time & Night Mode (4.3@4,945) Ǥ 26 2
Kids Place - Parental Control (4.1@36,885) Ǥ 27 3 Video Review 9/2013; Vorstellung 11/2013
Kids Zone - Parental Controls & Child Lock (4@7,607) Ǥ 14 2 LastUpdate: 2018-05-23 Video Review 8/2013; Test 10/2018 Datenschutz gut, aber nur für kleinere Kinder geeignet (no tracking; only suited for small kids)
Kid Mode: Free Learning Games (3.9@14) Ǥ 23 4 LastUpdate: 2018-09-09
Kakatu - Parental Control (3.8@1,845) Ǥ 28 5 LastUpdate: 2016-12-23 Intro 6/2016
KIDOZ: Safe Play with Free Games for Kids (3.6@17,388) Ǥ 20 3
KidsWorld: safe place for kids (3.6@6,139) Ǥ 15 15 LastUpdate: 2016-11-26
Kid´s Shell - Safe Kid Launcher - parental control (3.6@4,278) Ǥ 25 2
App Kids: Your Child´s First Digital Space (3.4@1,744) Ǥ 22 2
Child App Protector (3.4@197) 8 1 LastUpdate: 2017-08-14 incl. "kids timer" (lock app after xx minutes)
Xposed Kids Mode (0@0) LastUpdate: 2014-06-30 Intro 6/2014; Test 10/2014; Allow access to up to 8 apps, lock everything else

Other App-Lockers

2020-05-12

Super AppLock (App Protector) (5@14) 17 1 LastUpdate: 2013-07-24
New Applock - Aplication lock (5@1) Ǥ 15 4 LastUpdate: 2018-05-06 incl. photo on failed attempt
Hotspot Shield Privacy Wizard (4.8@24) Ǥ 15 6 LastUpdate: 2017-12-21
AppLock (4.7@132) Ǥ 37 6 Vorstellung 11/2013; Review 9/2013 | 2/2014; many themes available
LOCKit - App Lock, Photos Vault, Fingerprint Lock (4.6@490,473) Ǥ 30 7
AppLock - Fingerprint & Password, Gallery Locker (4.6@257,769) Ǥ 19 6 many themes available
Smart AppLock (App Protect) (4.6@156,589) Ǥ 34 15 / Smart AppLock Pro (3.6@2,929; ~EUR 3.25) Ǥ 23 7 LastUpdate: 2018-09-04 Video Review 8/2013
Applock (4.6@119,964) Ǥ 21 5
CM Security & Find My Phone (4.6@410) Ǥ 56 14 / CM Security Lite - Antivirus (4.6@270,374) Ǥ 32 1 LastUpdate: 2018-10-17 / Stubborn Trojan Killer (4.5@170,626) 20 2 LastUpdate: 2017-12-27 Vorstellung 5/2014; Test 11/2014; Sicherheits-Check 12/2015 (Cheetah Mobile = do-not-use!)
App Lock (4.5@359,879) 8 2
Norton App Lock (4.5@137,317) 15 3
App Locker Master (4.5@16,024) 18 3
AppLock - Fingerprint (4.4@845,548) Ǥ 32 3 Vorstellung 9/2013; Intro 1/2014
LOCX Applock Lock Apps & Photo (4.4@216,869) Ǥ 28 12
MaxLock - Xposed app locker (4.4@1,868) Ǥ 8 $Contains no trackers known to us \o/$ Github; XDA 3/2018
Perfect AppLock(App Protector) (4.3@284,898) Ǥ 26 7 / Perfect App Lock Pro (3.8@9,275; ~EUR 3.00) Ǥ 24 7 Vorstellung 9/2013
AppLocker | Lock Apps - Fingerprint, PIN, Pattern (4.3@130,963) Ǥ 21 19
App Lock: Locker w/ fingerprint, Parental Control (4.3@43,684) Ǥ 21 21
Green App Lock (4.3@12,522) 13 5 LastUpdate: 2018-03-06
App Locker (4.3@42) 10 LastUpdate: 2017-08-11 lock apps, messages, contacts, settings, calls
Smart Lock (App/Photo) (4.2@83,853) Ǥ 19 5
Super AppLock privacy security (4.2@49,348) 14 LastUpdate: 2016-06-17
AppLock (4.2@48,899) Ǥ 17 6
Apps Lock & Gallery Hider: AppLock, Gallery Locker (4.2@37,933) Ǥ 27 8
AppLock Pro (4.2@10,247) 24 4 LastUpdate: 2018-04-18
AppLock - Lock App and photo & video vault (4.2@100) Ǥ 14 2
AppDefender (App Lock) (4.1@7,680) 11 2 / AppDefender Pro (App Lock) (4.2@194) Ǥ 11 $Contains no trackers known to us \o/$
Lock app (AppLock) (4.1@5,265) Ǥ 13 1 LastUpdate: 2017-08-01
Applock Pattern (4.1@2,584) 11 1 LastUpdate: 2017-06-22
AppLock Master - Lockdown (4.1@1,105) 10 1 LastUpdate: 2015-11-17
App Lock Android (4.1@792) 9 3 LastUpdate: 2017-07-26
AppLock+ Plus (4@8) 7 2 Github; fork of Applock; incl. photo on failed attempt
Smart App Locker (3.9@63) Ǥ 21 4 LastUpdate: 2017-12-16
Avira AppLock+ (3.8@2,796) Ǥ 13 5 LastUpdate: 2018-07-17 Test 8/2016
ProtectedApps (3.8@152) 4 $Contains no trackers known to us \o/$ LastUpdate: 2017-10-19 Intro 7/2014; Video Tutorial 8/2014; Xposed based app locker
Toolwiz AppLock (Open Source) (3.6@134) Ǥ 18 2 LastUpdate: 2017-02-14 Github
Restrict Me (0@0) LastUpdate: 2014-09-10 Github; Disallow opening the Settings app when in a restricted profile
MinMinLock (0@0) LastUpdate: 2014-05-29 Github; XDA with screenshots; Video Review 6/2014; battery-friendly

For a web search, a good term is "kiosk mode" (e.g. android +"kiosk mode"), to be used with the search engine you trust. The result list will a.o. yield the following interesting pages:

But also to how-tos explaining to achieve kiosk-mode with functionality built-in to Android, such as „App Pinning”.

Further Readings:

Child Protection:
- Category Child Protection
- Android Parental Control: 3 Perfect Ways to Protect your Child (6/2013 - 11/2016)
App-Locker in general:
- 7 Best App Locks for Android (4/2019)
- Best App Lock Apps for Android (4/2019)
- Here’s how to lock files and apps with your fingerprint (2/2019)
- Android for Work isoliert und verwaltet Firmendaten (4/2015)
- So versteckt Ihr Dateien und Apps mit Android (10/2014 - 2/2019)
- 5 Best apps for password protecting your Android apps (12/2013)
- 5 Best Free Tools To Lock Or Password-Protect Apps On Android (11/2013)

2020-05-13

IzzyOnDroid

App-Locker

Child protection

Other App-Lockers