I discovered today that there are a lot of non-Apple low-cost iPhone (and iPad) chargers. The cost is very low, so I'm questioning about the quality of such chargers. Are they safe or can they damage the iPhone? It is better to buy Apple components or can we safely buy third-party components?
I say most of the time since some of the safety issues are only problems if there are faults. But in a poorly designed one, faults can cause fire and/or shock. Also poorly designed ones can get hot, which might be a problem in an enclosed space.
I personally would avoid anything that claims to be from Apple but is priced lower than theirs. That demonstrates the seller is willing to lie, so they are questionable to begin with. A reputable seller wouldn't try to pretend they are selling Apple chargers.
Your mileage may vary. Most 3rd-party accessories use inferior parts or less rigorous quality assurance. They may work, they may not.
Paying the extra $10 for the official Apple charger is probably worth it, when weighed against the risk of buying a new iPhone.
Plus, any issues with official accessories will be covered by the warranty.
Basically, it's hit or miss. Use at your own risk.
Are all third party chargers safe? No - not even close.
Are all third party chargers unsafe? Same answer.
If you use a charger somewhere where it won't start a fire and you can afford to replace a damaged phone / iPad if it comes to that then I'd say it's worth it to take into account your familiarity with electronics and perhaps decide to get a third party product you feel is made well enough.
Sadly, you can't trust UL and other stickers, since counterfeiters have no problem placing those safety logos on product that clearly haven't gone through testing. Don't be overly scared of every adapter, but also caveat emptor.