According to a study by AV-Comparatives, two-thirds of Android antivirus apps do not work properly. Some are even classified as viruses.

It's wise to secure your Android phone with antivirus software, but which of all the apps out there can you trust? AV-Comparatives tested 250 antivirus appsfor Google's platform, and only 80 of them (just under a third) passed the site's basic standards. They alone managed to detect more than 30% of the malicious apps released in 2018 and had zero false positives. Some of the apps the researchers tested were even detected as viruses.
In some cases, the reason 70% of tested apps fail is simple: they don't scan the app code. AV-Comparatives found that these apps simply rely on app whitelists or blacklists, which are sometimes very general.
The applications that passed the test are apparently from well-known security companies, with big names like AVG, Kaspersky, McAfee, Symantec, ESET, etc., which achieved a 100% performance. Many of those that did not pass were written by amateurs, were poorly printed copies of their counterparts, or by companies that clearly do not focus on security. Thirty-two of the tested applications have disappeared two months after the test, which took place in January.
This analysis serves as a reminder that you should choose antivirus tools from reputable companies with a long track record. However, it also shows what's available in the Google Store. Google at least tries to verify that the apps it hosts don't cause harm to users or break the law, but it can't enforce a basic level of quality required to keep your phone safe. So be careful what you download from the Google Store.
As for the results of the survey, 250 applications were examined and the 138 that failed the test are:
1Machine System Sdn Bhd, actionappsgamesstudio, Amantechnoapps, AMIGOS KEY, Amnpardaz Soft, AndroHelm Security, ANTI VIRUS Security, Antivirus Mobile Lab, antivirus security, appflozen, appsshow, Appzila, Arcane Security Solutions, AS team security phone Lab, asuizksidev, Ayogames, AZ Super Tools, azemoji studio, Baboon Antivirus, bESapp, Best Battery Apps, Best HD Wallpapers APPS, Best Tools Pro, BestOne, Bit Inception, BKAV, Bom Bom, Booster studio Laboratory Inc., brouno, Bulletproof AV, Caltonfuny Antivirus Phone, Cheetah Mobile, CHOMAR, Chromia, Cloud 7 Services, Core Antivirus Lab, CPCORP TEAM: Photo blur & photo blender, CreativeStudioApps, CY Security, Defenx, DefineSoft, DreamBig Studios, DU Master, electro dev, Erus IT Private Limited, Falcon Security Lab, Fast n Clean, fluer-apps.com, Formation App, Free Apps Drive, FrouZa, Galaxy TEAM, GameXpZeroo, GlobalsApps, gndnSoftware, GOMO Apps, GoNext App Developers, Gridinsoft, LLC, handy tools apps, Hello Security, Immune Smart, INCA Internet, infiniteWays007, Islamic Basic Education, Itus Mobile Security, JESKO, jixic, Kolony Cleaner, Koodous Mobile, lempea, LINE, LIONMOBI, Live multi Player Game, Main Source 365 Tech, Mama Studio, MAN Studio, Marsolis Tech, Max Antivirus Lab, Max Mobi Secure, MaxVV, Mob Utilities, Mobile Tools Plus, Mobtari, Mond Corey, M-Secure, MSolutions, MSYSOFT APPS, My Android Antivirus, NCN-NetConsulting, Nepelion Camp, Nisi Jsc, Niulaty, NP Mobile Security, NPC Studios, Omha, Oxic Studio, Pix2Pic Studio, playyourapp, Pro Tool Apps, prote apps, Protector & Security for Mobile, Puce, Radial Apps 2018, RedBeard, Secure Cloud, SecureBrain2, Security and Antivirus for Android solutions, Security Apps Team, Security Defend, SECURITY LAB, Security Systems Lab, SecurityApplock, Sept Max, ShieldApps, SjaellSoft, SkyMobileTeam, Smart Battery Solution & Creative Screen Lock, smarteazyapps, Software Center, Soft War, stmdefender, Systweak Software, TAIGA SYSTEM, Tokyo Tokyo, Tools dev, tools for android, Utilitarian Tools, Vainfotech, VHSTUDIO, Vikrant Waghmode, Virinchi Software, Virtues Media & Application, VSAR, Wingle Apps, Xtechnoz Apps, XZ Game, Z Team Pro.
The 32 that disappeared after 2 months are:
Antisecurity.inc, AppLocker Cleaner Booster, AppsNewLook, AVC Security, Bastiv, Big Fun Free Apps, Birina Industries, Cooler Technologies, Document Viewer 2019, Erus IT, GearMedia, Himlamo, koala security studio, LA Antivirus Lab, Mobile Antivirus Lab, Mobile Tools, NCK Corp, Ocean Developers, PICOO Design, Protection & Security for Mobile Lab, Rivalab, Secure Performance Dev, Smart bapp, Taobao, Top Maxi Group, TrustPort, Vasa Pvt, Vasonomics, Vitekco, wallpaperdus, Weather Radar Forecast, and zeeworkers.
And those that passed with flying colors, that is, with 100% success, are:
AhnLab, Antiy, Avast, AVG, AVIRA, Bitdefender, BullGuard, Chili Security, Emsisoft, ESET, ESTSoft, F-Secure, G Data, Kaspersky Lab, McAfee, PSafe, Sophos, STOPzilla, Symantec, Tencent, Total Defense, Trend Micro, Trustwave.
