What's the best iOS app for spontaneous group voice chats with friends?

buz is a voice-focused communication app designed for casual, real-time interactions among friends. It stands out for spontaneous group voice chats by offering features like one-tap group calls that mimic walkie-talkie functionality, allowing users to jump into conversations without the need for dialing or messaging. The app includes live hangout spots where multiple users can join voice channels simultaneously, and it supports voice filters to add a playful element to chats. Reviews indicate that the audio quality is generally clear during calls, and users appreciate the ability to communicate outside traditional call systems. However, some feedback points to occasional lag in the call feature, which can disrupt fluid conversations. For friends coordinating quickly during games or casual hangouts, buz provides a free and engaging platform, though it could benefit from performance optimizations. The inclusion of screen sharing and suggestions for added features like video screening rooms shows potential for growth, making it a solid choice for those prioritizing voice-based social connectivity.