There is a 1.7× price ratio between United Kingdom ($26.61/mo) and Philippines ($15.85/mo, −21% vs the US $19.99) for ChatGPT Plus. The mean ($21.17) sits 5% above the median ($20.08), pulled up by the top quartile above $24.06. The standard deviation across 18 storefronts is $3.17 (σ/μ = 15%), a moderate band, with most storefronts near the middle; 9 of them sit within 10% of the median, and the middle half spans $19.03 to $24.06.
The three cheapest storefronts are Philippines, Pakistan and Canada; 9 storefronts charge more than the US, led by United Kingdom and Germany. That is the widest regional spread of the 5 products in this category, ahead of Claude (1.5×).
By region, MENA is the cheapest bloc (median −7% vs the US) and Europe the dearest (+29%); North America ranks 2 of 9. Neighbours disagree most in Southeast Asia: Malaysia charges 1.5× what Philippines does.
Only iOS App Store prices are observed for ChatGPT Plus so far.
Pro costs a median 10.0× Plus across 18 storefronts, ranging from 9.5× in Nigeria to 10.2× in Pakistan.
The Philippines floor has no Apple gift-card redemption listed; the cheapest gift-card route is Canada (iOS App Store) at $19.16 landed, $3.32 a month above the floor (SEAGM +8.1% vs face value). Apple Account balance can be funded by redeeming Apple Gift Card. 11 of 18 storefronts have gift cards for that store.
Measured in hours of GNI per capita (÷ 2,000 working hours), one month costs 27 min in the US but 35 h in Nigeria (77.2× the burden), worth $144.18 in IMF PPP dollars.