The Mobile applications has made the world a easier place to live with everything available on their fingertips but there’s a firm competition in between the apps to see who has the most number of downloads so below mentioned are the top 10 most downloaded apps worldwide by Android and ios users both.
TikTok:

Image Courtesy: news24online.com
In November of 2018, TikTok reported that the number was 680 million monthly active users. We estimate that it’s increased to 800 million as of now (July 2020). Total App Downloads – The TikTok app has been downloaded over 2 billion times worldwide, as reported by Sensor Tower 0n April 29, 2020.
Zoom:

Image credit: Mashable
By February 2020, Zoom had gained 2.22 million users in 2020 — more users than it amassed in the entirety of 2019. On one day in March 2020, the Zoom app was downloaded 2.13 million times. Daily average users rose from about 10 million in December 2019 to more than 300 million daily meeting participants in April 2020.
WhatsApp:

Recently, a report by Sensor Tower also revealed that WhatsApp is the most downloaded app across the world. The app has crossed 850 million downloads across the world in 2019. The report suggests that WhatsApp has been the number one downloaded app since Q3, 2016. The instant messenger remained on top this quarter, leading four Facebook-owned apps in the top five. WhatsApp experienced a huge growth of 39% Q/Q in Q4 2019, after decreased downloads in the previous four quarters.
Facebook:

As of the third quarter of 2019, total monthly active Facebook users numbered 2.45 billion, making it comfortably the world’s largest social media platform. To give this a bit of perspective, this is 1 billion more people than currently live in China. After WhatsApp, it was the most-used mobile app in this same period, according to the same source. And after another stablemate, Facebook Messenger, it was the most-downloaded app.
Messenger:

There are 1.3 billion Messenger users globally.Facebook Messenger is one of the leading messaging platforms in the US with more than 2 million monthly downloads. In 2018, more than 126 million US mobile users accessed Messenger.
Instagram:

In June 2018, Instagram had reached one billion monthly active users, up from 800 million in September 2017. The app is one of the most popular social networks worldwide.
Google Meet:

As per a report by AppBrain, Google Meet had surpassed the previous 50 million downloads mark on Play Store in May and in less than two months the numbers have doubled up. AppBrain noted that Google Meet has surpassed the 100 million download mark on Play Store. The numbers drastically went up after the app was made free for all users and it was integrated into users’ Gmail account. This made it easier for people to host calls and meetings on Google Meet
Aarogya Setu:

Aarogya Setu app crosses 100 million downloads. Government-regulated Covid-19 contact tracing app Aarogya Setu has crossed 100 million downloads after 40 days of launch, making it one of the fastest-growing apps globally.
YouTube:
YouTube saw over 29.3 million installs of the app globally, a 28.3% increase over May 2019. The US and India saw the most downloads of the app at 16% and 11.2 % respectively. Netflix was the second most installed streaming app worldwide in May with over 23.3 million installs.
Snapchat:

As of the second quarter of 2020, photo and video sharing app Snapchat had 238 million daily active users worldwide, up from 203 million global DAU in the corresponding quarter of 2019.