About this app

Aux is a music player for your Synology NAS. The Aux app works with Audio Station running on your NAS to stream or download any audio file compatible with iOS, including lossless and high resolution audio formats — MP4 / AAC, MP3, Apple Lossless, FLAC, WAV, Dolby Digital, Dolby Digital Plus, and Dolby Atmos spatial audio. Aux is a fast, ad-free, and feature-rich app that connects directly to your NAS. Since Aux uses no servers of its own, your username, password, and all other data are exchanged securely and directly with your NAS. If you've chosen not to expose your NAS directly to the internet, Aux also works with Synology's own QuickConnect service to relay the connection through Synology's secure servers. Server Management • Secure, encrypted, HTTPS network connections • Connect by QuickConnect, domain, DDNS, or IP address • Secure, encrypted login with 2FA / OTP support • Secure Keychain storage with Touch ID / Face ID protection • Multiple server / NAS support • Download mode for offline playback • Streaming mode for real-time playback • Dynamic, automatic reconnection when switching networks with QuickConnect (LAN to WAN and vice versa) • Download manager to pause, cancel, reorder, and restart downloads • Smart management of background and audio download sessions to keep downloads going in the background Music • Audio Station folder, artist, album, and song browsing • File Station folder browsing — view images and files, download audio formats not recognized by Audio Station • Pinned item support for quick access to favorites • Search your NAS or downloaded files across artist, album, track title, or file / folder name • Link sharing (DSM) and file export (iOS share sheet) • Queue downloads of entire artists, folders, or subfolders • View MP3 / MP4 / FLAC tags and audio metadata indexed by Audio Station • View album- and file-level artwork, tap to view fullscreen • Build a playlist with replace, shuffle, insert, append • Choose to download or stream audio by default and when adding items to your playlist Audio Player • Play any audio format supported by iOS, including Dolby Audio formats not supported by Audio Station • Gapless playback • Lossless and high resolution audio support (16/44 to 24/384 — only limited by your DAC — no forced transcoding to 16/48 WAV) • Seek & skip with Siri, lock screen, headphone remote, or in-app controls • Tap & hold to seek ahead / back instantly (no more waiting to seek) • Seek across track boundaries to hear the end of that last song one more time • A/B song comparison — mark a time, then all tracks start at the marked time • Artwork view for album / file artwork, tap to view fullscreen • Playlist view to manage queued tracks • Metadata view for MP3 / MP4 / FLAC tags and audio metadata • AirPlay output with bitstreaming / buffering options • Shuffle / unshuffle, repeat track, repeat playlist • Saved playlist and playback position across app launches UI • Optimized for one-handed use on the go — important controls are on the lower third of the screen • Quick list controls — tap & hold to enter edit mode; two-finger drag to select; buttons to select all / none, pin, share, add to playlist, download • Haptic feedback for gestures and interactions • Many customization options — • Keep-ahead x tracks for downloads/streams • Choose between skip or seek controls • Skip/seek by x seconds • Pause audio on interruptions • AirPlay bitstreaming (for surround sound) or 24-bit / 48kHz ALAC buffering • Replace or append to the current playlist by default • Written with the latest native Apple technologies from the ground up — Swift, SwiftUI, SwiftData, etc Aux is developed independently and is not affiliated with Synology Inc. Aux requires an affordable subscription to support its continued maintenance & development. Try it out with a free trial, and if you find something you’d like to see changed, we’re happy to receive feature requests. Terms of Use: