ChatGPT Plus lists at $20 per month, but the actual price varies between about...

https://www.slideserve.com/aaron_ward92/why-does-chatgpt-plus-cost-more-on-android-than-on-the-web

ChatGPT Plus lists at $20 per month, but the actual price varies between about $13 and $27 depending on your location. This difference is mostly due to taxes like VAT or GST and extra fees from app stores like Apple or Google