Bubble wrap in your browser: https://toolster.net/bubble_wrap
The sheet never ends, so you can keep popping for as long as you like. Hold a bubble down and it squashes a little before it bursts with a click, and no two pops sound quite the same.
What happens in the clip:
1. Start switches the sound on.
2. One bubble, pressed and held until it pops.
3. A drag across the sheet pops a whole row (turn off Swipe to pop if you want them one at a time).
4. Small, medium and large bubbles. The large ones have a deeper pop.
5. New sheet, then full screen with nothing but bubbles.
A counter in the corner adds up your pops. Works on a phone too, no app and no sign up.
Other calm-down toys on the site: https://toolster.net/antistress
Music: "Ethereal Relaxation" by Kevin MacLeod (incompetech.com), licensed under CC BY 4.0