Why do some promo codes only work in the mobile app and not on desktop? It drives me crazy.

It’s super common, and it’s not a glitch — it’s marketing strategy. Brands push mobile-only promo codes because every app installation is valuable: they get higher engagement, can send push notifications, and collect more usage data than on desktop. Apps also convert better, so companies are willing to offer deeper discounts there. Another factor is tracking — it’s easier for brands to verify new users or unique installs through the app, which helps them prevent abuse of first-time codes. If you’re hunting codes, coupon aggregators like https://savemycent.com/ can help you spot which ones are app-only — worth checking before you start.

Brands love mobile-only codes because app installs boost engagement and tracking. Apps convert better too, so they offer deeper discounts there. Always check which promos are app-exclusive — coupon sites help spot them quickly.