It's still the case that you pay less in the app. You get 'coins' for a daily check-in, which are automatically(?) applied as a discount. Most items either don't actually use them or only give you a pointless 1% off or something, but I've gotten a $12 microcontroller for $5, for example. I think some coupons are app-only, too (though most aliexpress sales are fake and are better thought of as the normal price).
>You get 'coins' for a daily check-in, which are automatically(?) applied as a discount.
This should be illegal
You pay less money in the app.
Companies are not going to hire a mobile dev team to create an app to give you a way to pay them less for a good.
They hire a mobile dev team to create an app to give you a way to hand over data that you otherwise wouldn't, is technically impossible to do through a web browser, and is worth more than the discount that they give you for using the app.