Airfoil is described as 'Send any audio to the AirPort Express. Send any audio to AirPort Express units, Apple TVs, and even other Macs and PCs, all in sync! Airfoil for Mac gives you your audio - everywhere' and is a popular Audio Router in the audio & music category. There are more than 25 alternatives to Airfoil for a variety of platforms, including Windows, Mac, Linux, Android and iPhone apps. The best Airfoil alternative is FineTune, which is both free and Open Source. Other great apps like Airfoil are Audio Share, SonoBus, PairPods and TuneBlade.
Menu bar utility for macOS offering per-app and per-device audio control, app routing to output devices, integrated 10-band EQ with 20 presets, real-time VU metering, volume boost up to 200 percent, quick device selection, persistent settings, and audio muting.
Audio Share can share Windows/Linux computer's audio to Android phone over network, so your phone becomes the speaker of computer. (You needn't buy a new speaker😄.).
SonoBus is an easy to use application for streaming high-quality, low-latency peer-to-peer audio between devices over the internet or a local network.
A macOS menubar app that lets you share audio between two Bluetooth devices simultaneously. PairPods makes it easy to create shared listening experiences.
TuneBlade - Stream audio to Airport Express, Apple TV, AirPlay compatible speakers and HiFi Receivers.
Listen to your PC audio, use your phone as a mic or stream audio from your phone.
Stream What You Hear (SWYH) is a Windows application to broadcast the sound of your computer (ie: “what you hear”) on an UPnP/DLNA device such as TVs, amps, network receivers, game consoles, etc...
Wireless streaming technology that lets users share music and multimedia across homes via speaker docks, AV receivers, TVs. Compatible with diverse entertainment systems and licensed to third-party manufacturers for seamless integration.
SoundWire lets you send any music or audio ("what you hear now") from your Windows or Linux PC to your Android mobile devices.
Advanced Android streamer for audio from Spotify, Deezer, Apple Music to devices like SONOS, Apple TV, Chromecast. Runs in background, supports Tasker, one-click streaming, with Apple AirPlay, Google Cast, DLNA, Amazon Fire TV compatibility.
Utility for turning your Android smartphone or tablet into a wireless speaker.
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Won't stream to airplay devices