A music player for people who own their music.
Featured by App Store EditorsGreat apps on iPhone DuoMaybe it lives on MEGA. Maybe Dropbox, a Nextcloud box, a Synology in the cupboard, a folder on a local drive. Connect it once and Isai reads the tags, builds a proper library with albums, artists and artwork, and streams straight from where the files are.
Nothing goes through a server in between. Nothing is transcoded on the way.
Add a source and Isai reads the tags, builds a proper library — albums, artists and artwork — and streams straight from where the files are.
Your own account, or a public or shared folder link with its key.
Sign in once and stream your files.
Nextcloud, ownCloud, Synology, pCloud, Koofr — or any WebDAV share.
A folder on this device. Free, with no purchase at all.
If you subscribe, on the same shelf as the files you own.
Nothing is proxied through a server of ours. There is no catalogue to subscribe to, because the catalogue is yours.
Own the same record more than once — the Hi-Res FLAC on MEGA, the 16-bit rip beside it, the Apple Music copy — and Isai keeps them as one album with its editions listed underneath, each named by the source it came from and the format it is in.
FLAC, ALAC, M4A, WAV, AIFF, MP3, AAC, Ogg Vorbis and Opus. DSF and DFF, including DST.
DoP to a DAC that takes it, or careful conversion to PCM for everything else — a 96-tap FIR with a Kaiser low-pass, named in the Signal Path so you can see it happen.
Gapless, with crossfade when you want it and never where it would harm the sound.
Embedded lyrics and .lrc files follow along as the song plays.
Tap the quality badge and Isai shows you what happened between the file and the output: the source, the decoder, any processing, the device it went to, and a verdict.
On the Mac, BIT PERFECT means exactly that. Isai can take exclusive access to your DAC, set its sample rate and word length to match the file, and then read the settings back from the hardware to check. It never guesses. If the equalizer is on, the verdict says so. If the samples were resampled, it says that too.
On iPhone and iPad, Isai asks for the file’s native rate on an external DAC and reports whatever the system gives it. Honest, even when the answer is not what you hoped for.
Decimated to 176.4 kHz PCM in the app (96-tap FIR + Kaiser low-pass), then played as PCM.
Add a source on your iPhone and it appears on your Mac.
Favourites, playlists, play history and where you stopped in a track all travel through iCloud. So does the library index itself: scan a source once and your other devices pick up the albums without reading a single file again.
Downloads keep the original bytes, run in the background, and wait for Wi-Fi if you tell them to.
Two copies of Isai on the same Wi-Fi can drive each other.
Sit on the sofa with your phone and play through the Mac that is wired to the good DAC. The queue, the position and even the Signal Path follow the device that is making the sound — which is how a phone comes to be showing you a BIT PERFECT verdict it is not producing.
Nothing leaves your network and there is no account to create. Your own devices recognise each other through your Apple Account; anything else has to be let in by hand, with a code shown on both screens.
A/B loop Loop 1:58 — 2:18
App Store Editors picked Isai for Great apps on iPhone Duo, their collection of favourite finds for the phone that opens into two screens.
Folded, the album art fills the cover screen and every page takes its colours from the cover; animated artwork plays in motion. Open the phone mid-album and the page widens in one move, artwork still playing, to add the tracklist, About This Record, Up Next, lyrics and the Signal Path on the left.
And when you want to hold the machine, Pure Music Mode turns the cover screen into a cassette player, a CD player or a turntable, with your albums as cassette cases, jewel cases or record sleeves when you open it. It changes how Isai looks, never how it sounds.
Read about the App Store feature →
See every deck in Pure Music Mode →
No accounts. No ads. No analytics. No servers of ours.
Provider credentials go to your iCloud Keychain; your library index stays in your own iCloud container. We never see any of it.
Isai is free for the music already on your device.
One purchase, made once, unlocks cloud sources — MEGA, Dropbox and WebDAV — and Play On, and it follows your Apple Account to every device you sign in on.
One-time purchase — $9.99
A hi-res music player for iPhone, iPad, Mac and Android. It plays music you already own, streaming it straight from MEGA, Dropbox, any WebDAV server or a folder on the device. Nothing is transcoded and nothing goes through a server in between.
Yes. In October 2026 App Store Editors featured Isai in Great apps on iPhone Duo.
Yes. Folded, it is an immersive player coloured by the album art; unfolded, the page widens to add the tracklist, album details, lyrics and the Signal Path. Pure Music Mode turns the phone into a cassette player, a CD player or a turntable.
FLAC, ALAC, M4A, WAV, AIFF, MP3, AAC, Ogg Vorbis and Opus, plus DSD as DSF and DFF, including DST. Playback is gapless.
On the Mac, yes, and it checks by reading the DAC’s settings back from the hardware. On iPhone and iPad it asks an external DAC for the file’s native rate, and the Signal Path reports what the system actually delivers.
Free for music on your device. Isai Pro is a one-time $9.99, with no subscription, for MEGA, Dropbox, WebDAV and Play On.
No. No accounts, no ads, no analytics and no servers of ours. Credentials stay in your iCloud Keychain.
Isai (இசை) is the Tamil word for music.
Bring your own storage. iPhone, iPad, Mac and Android.
Isai is out now on the App Store for iPhone, iPad and Mac, and on Google Play for Android.
On Android, Isai plays your own files from the same sources, but it doesn’t have Play On (the remote that drives one copy of Isai from another) or Apple Music. Those are on iPhone, iPad and Mac only.