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

https://telegra.ph/How-Do-I-Compare-ChatGPT-Plus-Prices-on-Web-vs-iOS-vs-Android-08-05

ChatGPT Plus is advertised at $20 per month, but the actual price can range from about $13 to $27 depending on where you subscribe. This difference comes mainly from taxes like VAT or GST, and extra fees from app stores like Apple or Google