ChatGPT Plus is advertised at $20 per month, but the actual cost can range from...

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

ChatGPT Plus is advertised at $20 per month, but the actual cost can range from about $13 to $27 depending on your region. This variation happens because taxes like VAT or GST get added, and app stores on iOS and Android often apply extra fees