Over the past one and a half years, Stack Overflow has lost around 50% of its traffic. This decline is similarly reflected in site usage, with approximately a 50% decrease in the number of questions and answers, as well as the number of votes these posts receive.
The charts below show the usage represented by a moving average of 49 days.
What happened?
The timing doesn’t really add up though. ChatGPT was published in November 2022. According to the graphs on the website linked, the traffic, the number of posts and the number of votes all already were in a visible downfall and at their lowest value of more than 2 years. And this isn’t even considering that ChatGPT took a while to get picked up into the average developer’s daily workflow.
Anyhow though, I agree that the rise of ChatGPT most likely amplified StackOverflow’s decline.