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Most people just use Google Maps, it's pretty straightforward: you type "charger" or "outlet" and it shows you what's nearby with ratings and hours. If you have an electric car, there are specific apps like PlugShare or ChargeNow that are made for that and show availability in real time.
Don't fall into the trap of downloading a bunch of specific apps for this - most of the time it's just wasting phone space. Google Maps works pretty well, but there's a detail that people tend to ignore: when you search for "charger" or "outlet", the results can include electronics stores and restaurants that randomly mentioned outlet on social media. Then you get there and it's not really what you were looking for.
If you have a phone, laptop, or any generic device, just use Maps normally but filter by place type - cafeteria, mall, coworking space - those usually have legitimate outlets. But if you have an electric car, then it makes sense to use apps like PlugShare (which focuses on vehicle chargers) or even your car manufacturer's specific app, because the location is more reliable. But to find a quick phone charger in your day-to-day life, Maps with some common sense when filtering is the way to go.
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