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Teleparty (formerly Netflix Party) is pretty much the standard - it syncs playback across devices so everyone watches at the same time and you can chat in a sidebar. If you're all on the same streaming service, it's seamless, though keep in mind it only works with certain platforms like Netflix, Disney+, and Hulu. For more flexibility, some people just start a video call on Discord or Zoom and hit play together on whatever platform they're using, which works for anything but has the obvious downside of needing to stay on a call the whole time.
Before you pick a platform, make sure everyone's internet can actually handle group watching - lag kills the vibe way faster than picking the "wrong" service. The syncing tools work well enough, but here's something people skip: test your audio setup beforehand because watching across time zones means someone's always on headphones at weird hours, and bad mic quality makes the chat part pointless. If you're not all subscribed to the same streaming service, sometimes it's worth splitting the cost of one account temporarily instead of hunting for a movie across five different platforms - just rotate who pays and you'll probably save money anyway.
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