Proton VPN Is Showing Different Prices: Inside Its €2.99 vs €3.49 A/B Test | The CyberSec Guru
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An investigation into Proton VPN's pricing page found an A/B-test tag linked to two VPN Plus prices: €2.99 and €3.49 per month

Proton VPN’s pricing page exposed an ab-test identifier linked to two VPN Plus prices: €2.99/month (70% off) and €3.49/month (65% off). Repeated testing produced B → A → B → A → B, with the variant matching the rendered price each time. €12 difference over 24 months.