Well aside from Product Hunt I'm assuming:
If I go on screen time it's Whatsapp followed by Twitter and LinkedIn.
By now, Notion mobile app has become a go-to for so many things. To the point where I have my personal account with my budget tracker, daily planner, to-do lists etc. And even a colab page with my husband's account where we keep a running grocery list and "movies to watch".
PhonePe - it's for India only but I can do 90% of my online transactions - recharging my cellphone plan, paying my daughter's school fees, paying electricity, landline, broadband bills, book train & bus tickets. Anything you ask for is there on PhonePe.
An underrated app this the pomodoro! It's a super simple timer that goes on for 25 minutes of work and 5 minutes of rest. Especially working from home, it's so easy to break down work into smaller chunks, enabling you to actually focus while you're working!
you can also customize the work and break times!
This is a great question! I feel like it often takes asking something like this to realize how few apps people tend to use.
I'd say Notion, Spotify, Mint, Slack, Gmail (Uber and CitiBike are useful as well)
Of course, also Apple's apps (such as Messages)