Want to fast-charge your iPhone 8 on the cheap? Here are 5 compatible USB-PD adapters
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Still, Apple does give you other options, as it lists on its official support pages that the fast-charging functionality of the new iPhones is certainly accessible by plugging in certain third-party USB Power Delivery (USB-PD) adapters, and combining them with an "Apple USB-C to Lightning" cable (sold separately for $25).
Long story short, as you can see from Apple's support pages snap below, you can fast-charge your iPhone 8, Plus or X with a third-party adapter for cheaper, that is why we are making a list of what's out there and USB-PD on the market that can top up your fancy new iPhone in no time.

Things that are NOT allowed: