What's the best product to avoid slouching at your desk?

I would recommend using a reminder app like Due with with multiple notices set to remind you to sit up straight, take standing breaks, drink water, and look away from a screen periodically (20/20/20 rule).

Definitely one of my best purchases. Super cheap for a standing desk, quick/easy to set up, folds away when you don't need.

I really need to get one of these... I hate how chairs are always designed for "better posture" but I end up slouching uncomfortably in them anyways :( I wish there was a chair designed for inevitable slouching and working at a desk

This one seems like a great way to keep your posture corrected at all times. I have pre-ordered one as well. 👍🏻

This will really help you fix your posture until you dont need it anymore and you will be sitting the right way on your own

It may not be the "best," but based on its cost performance and ease of use it could be. Plus you get to hear a cat meow whenever you mess up, although could that may be positive reinforcement of a negative behavior? Anyways, simply install the app and it will tell you when you start slouching by using your computer's camera. Fun fact: Nekoze means "cat back" in Japanese, and cats have horrible posture… in Japan 😉

I wear Lumo Lift which gives gentle reminders to straighten back up. After a week I could see the difference because it really helps to build the habit. The only huge drawback for me is a short battery life :( So you have to charge it every other day.