The audiophile streamer Now playing

Audiogravi^ty

Audiogravi^ty is a streamer. A conductor, not a soloist.

MPD, Roon, HQPlayer, AirPlay, UPnP sources and renderers, internet radio — every engine, every source, down to DSD and Hi-Res PCM. Send your library to any network renderer. Audiogravi^ty installs, configures and conducts every one of them — from the system up to your Qobuz, Tidal and HIGHRESAUDIO libraries. It replaces none of them. One interface. Total control. Every engine, every source, down to DSD and Hi-Res PCM. Audiogravi^ty installs, configures and conducts them, and replaces none of them.

Install now — 30-day trial included See features

30 d

Free trial

€49

Pro · lifetime

1×

Machine · perpetual

Subscription · ever

HQPlayer HQPlayer takes the stream, and Audiogravi^ty still reports what comes out of it — here DSD128, and the DAC receiving it.

Fed over UPnP Through HQPlayer What comes out

HIGHRESAUDIO Their Hi-Res catalogue, played on your own DAC — with the resolution you actually get, in writing.

From HIGHRESAUDIO To your DAC The real resolution

Qobuz Qobuz plays through your own chain — and the screen names every link of it, down to the DAC.

From Qobuz The whole chain What is really playing Switch output mid-track

Tidal Tidal runs through the same chain as everything else — same controls, same readout, same DAC.

Tidal, signed in Hi-Res, stated Your DAC

Radio A web stream gets the same treatment as a local file: named source, named codec, your own DAC at the end.

Internet radio Same chain Same DAC

Browsing Every service browsed the same way — genres, playlists, new releases — from one screen.

Their catalogue By sub-genre Add in one tap

Always playing Browse Qobuz's new releases while a station keeps playing — the transport never leaves the bottom of the screen.

New releases Add to the queue Playing throughout

Signal path The whole chain drawn out — streamer, DAC, amplifier, speakers — with the link between each one named.

The active output Every box, in order To the speakers

Sources Your library and your subscriptions, connected once and shown as they are — online, connected, or not.

Your own files All connected HQPlayer too

Services Every audio service on the box, what it is using, and the buttons to stop or restart it.

Up or down What it costs Start, stop, on boot

Profiles One tap swaps the whole setup: what starts, what stops, which output — and a log of every switch.

One per use Starts and stops What ran, and when

Configuration The real configuration files, editable in place — with the output each service actually uses shown beside it.

The real file Flagged if critical Its real device

Tuning Jitter measured over time, and the scheduling priority of every process that touches the audio.

Jitter, measured RT priorities Set per process

Settings Pick a theme, light or dark, get notified on this device, and sign in with Face ID instead of a password.

Light or dark Face ID

Features

From the machine
to your Qobuz, Tidal & HIGHRESAUDIO library.

Twenty-one modules orchestrating every layer of the stack — system tuning, service control, signal-path visualisation, unified transport across MPD, Roon, HQPlayer, AirPlay, UPnP and internet radio. Starter ships with the essentials; Pro unlocks the deep audio-engineering surface.

PRO

Unified transport across every engine

One interface, one set of controls, every engine the box runs — MPD, Roon, HQPlayer, AirPlay and UPnP, simultaneously. A stream origin badge always tells you where the audio is coming from, and the live Hi-Fi readout — format (PCM / DSD), sample rate, bit depth, instantaneous bitrate — refreshes on every track change. The queue reads every source, with per-source badges and a filter when they mix. Audiogravi^ty conducts; your engines play.

MPD · Roon · HQPlayer · AirPlay · UPnP · stream origin · queue by source · sleep timer · live Hi-Fi readout

PRO

Auto-discovery

Audiogravi^ty scans your network on demand. MPD instances, Roon Bridges, UPnP servers, AirPlay receivers — all picked up automatically.

MPD · Roon · UPnP · AirPlay · HQPlayer · SSDP

PRO

High-resolution library

Browse Roon, MPD, MinimServer, Qobuz, Tidal and HIGHRESAUDIO from one interface — album view, full-text search, direct playback with cover art. Star an album to favourite it on its streaming service; tap an artist in search to open their albums across every source. Your Qobuz and HIGHRESAUDIO playlists are managed from here too: add the track playing or a whole album, open a playlist to play it from any track, rename it or tidy it up. Pick a track, pick a renderer: the music flows at full resolution — even local NAS/USB files cast to a network renderer, bit-perfect. Qobuz, Tidal and HIGHRESAUDIO require an active subscription.

Roon · MPD · UPnP/DLNA · Qobuz · Tidal · HIGHRESAUDIO · favorites ★ · your Qobuz & HIGHRESAUDIO playlists · local cast · UPnP renderers

PRO

Internet radio without a parallel signal path

Most apps treat radio as a second-class source — a different player, a degraded path to the DAC, no metadata, no cover art. Here it isn't. Stations flow through the same transport as your FLAC library, route to the same output zone, surface the same Hi-Fi readout. Curate your own collection, filter the catalogue down to Hi-Res, save the ones worth coming back to. With HQPlayer as your output, they can go through its filters too — stations broadcasting in AAC included, converted to FLAC as they arrive.

Same transport · Hi-Res filter · live metadata · cover art

PRO

HQPlayer — on the box, or on your network

Run HQPlayer Embedded on the box itself: install it from the Audio Software page — its licence is shown first, and nothing installs until you accept it — choose its output as you would any player's, and open its own settings page in one tap. Or control the HQPlayer you already run on your network, auto-discovered and connected in one tap. Either way, change its sound-shaping settings — interpolation filter, noise shaper, output mode and volume — without leaving the couch, and send anything you can browse — your own library, a media server, internet radio, Qobuz, Tidal and HIGHRESAUDIO — through its filters and upsampling, bit-perfect. Run more than one? Each keeps the filter, shaper and mode you chose for it. What HQPlayer cannot read — an ALAC library, a station broadcasting in AAC — is converted to FLAC on the way, losslessly; DSD is never converted. Move around inside a track from your phone, and the display follows the album, track by track. Audiogravi^ty also recognises which HQPlayer it is connected to, and which version, and keeps the NAA on your box on the matching line.

HQPlayer Embedded on the box · Filter · Shaper · Mode · Volume · Auto-discovery · ALAC & AAC converted · NAA kept in step · Any source through HQPlayer

STARTER

One-tap profile scenarios

"Roon + HQPlayer" for serious listening. "MPD + upmpdcli" to expose your streamer as a UPnP renderer — controllable from any UPnP control point: JPLAY, BubbleUPnP, mconnect. OpenHome apps such as Kazoo work too — one switch in the UPnP bridge's configuration form. "AirPlay only" for background music. Each profile lists exactly which services to start and stop — conflicts resolved automatically, and a live health bar shows the whole chain is up.

Conflict resolution · live health · history

PRO

UPnP Control Point — play to any renderer

Audiogravi^ty becomes your UPnP control point: discover every renderer on your network — network amplifiers, dedicated streamers, DLNA speakers — and drive them directly from the interface. Browse any source, hit Play: the stream reaches the renderer bit-perfect, at full resolution, without touching the server's audio path. A live "Up next" strip shows the next track as it is loaded onto the renderer.

UPnP renderers · DLNA · bit-perfect · output selector · Up next

STARTER

Push notifications

Get notified the instant an audio service fails, the CPU crosses the critical temperature, a software update is available or a profile is activated. Even when the PWA is closed.

Service down · Critical temperature · Update available · Background push

PRO

Give your music its own CPU cores

Your player gets the processor before anything else, on cores reserved for it, with its audio held in memory — never pushed to disk mid-track. Written as system overrides that survive updates and can be undone at any time.

FIFO · RR · MEMLOCK · RTPRIO

PRO

Measure the stability, don't assume it

Run the test from your browser and read the result in microseconds: proof that the machine really holds a steady beat, not just that the software is installed. Compare before and after, each run timestamped and kept.

cyclictest · iPerf3 · jitter histograms

PRO

Full speed where it plays, quiet elsewhere

The cores playing music run flat out; the others stay quiet and cool. A per-core heat map shows where the warmth is, and a THROTTLED badge appears the moment the machine slows itself down to cope — before your ear catches it.

governor · Performance · Powersave · thermal map

STARTER

Set up and edit audio service configs without breaking them

New box? The guided setup detects your DAC and music library and generates a minimal, bit-perfect config for MPD, AirPlay and UPnP; Guided mode then changes an output or library in two clicks — only what you touch is rewritten. For deeper edits: form view, a full text editor with syntax highlighting (JSON, INI, XML, libconfig), a side-by-side diff to review every change, and an automatic backup before each save, restored in one click.

guided setup · mpd.conf · roon · AirPlay · upmpdcli · live diff

PRO

Live signal-path visualisation

An interactive graph of your entire Hi-Fi chain — every source, every active audio process, down to the DAC. Each link shows the exact stream format (PCM / DSD · 44.1 kHz → 768 kHz · 16 → 32 bit), a full-resolution badge, per-link latency and live play state. Click a link to hot-reroute the audio to a different DAC — gapless on MPD; AirPlay warns you first, since its receiver has to restart.

interactive graph · pan · zoom · minimap · hot rerouting

STARTER

Service tile + live sparklines

Live systemd state. Instantaneous CPU, memory, network and disk with LOW/MEDIUM/HIGH thresholds. Uptime shown.

Live systemd · sparklines · uptime

STARTER

Complete audio device inventory

Every ALSA card, USB interface, subdevice and hardware capability your kernel sees — without aplay -l or lsusb. Plus CPU, temperature, memory, disk and network at a glance.

ALSA · USB · sub-devices · hardware caps

STARTER

WebAuthn passkeys

Face ID, Touch ID, fingerprint, YubiKey. Multiple devices per user, managed individually. Role-based access — Admin, User, Guest.

FIDO2 · Face ID · YubiKey · RBAC

STARTER

One-click self-update, with automatic rollback

When a new release ships, the Admin tab shows a banner: one click and your password — the box downloads, swaps and health-checks the new version, with live progress across the restart. If anything goes wrong it rolls back automatically to the previous version. Never left on a broken update, never a terminal.

Update banner · health-check · auto rollback · no terminal

Audio pipeline · Pro

Every device.
Every connection. Live.

The pipeline graph is the signature view of Audiogravi^ty. It renders your audio-topology.json — the physical and virtual map of your Hi-Fi chain — as a live, interactive SVG you can pan, zoom and steer from. Click any link to open the steering popover and reroute the ALSA output — gapless on MPD; AirPlay warns before restarting its receiver.

Idle Active stream Full resolution

Audio priority · Pro

End the jitter.

A 200 µs interrupt is enough to make a DSD256 stream audibly grainy. Audiogravi^ty gives each audio service the priority it needs, and writes those settings beside the originals rather than over them — an update cannot undo your work, and one click puts everything back. Then measure the result yourself, in microseconds.

What you control, per service

SchedulingAudio threads run ahead of everything else — strict or round-robin. (SCHED_FIFO / SCHED_RR)
PriorityWho gets the CPU first: your player, then AirPlay, then the rest. (1 → 99 — MPD at 80, AirPlay at 60)
Dedicated coresEach service gets its own CPU cores, shielded from the rest of the system. (affinity)
MemoryAudio stays in RAM — never pushed to disk mid-track. (MEMLOCK)
Internal threadsA ceiling so a single service cannot starve the others. (RTPRIO)
CPU speedFull speed on the cores playing music, low power on the idle ones — re-applied at boot. (governor)

# /etc/systemd/system/mpd.service.d/audio.conf

# written by Audiogravi^ty · upgrade-safe drop-in

[Service]

CPUSchedulingPolicy=fifo

CPUSchedulingPriority=80

CPUAffinity=2 3

LimitMEMLOCK=infinity

LimitRTPRIO=95

Nice=-19

# verified by cyclictest

# max latency 47 µs · ✓ bit-perfect

SSE telemetry, peak

Live CPU, temperature, I/O and network streamed to every connected browser. Backs off to 30 s at idle.

47µs

Cyclictest max latency

On a tuned Pi 5 with FIFO/80, CPU pinning and MEMLOCK — measured from the browser, archived with timestamp.

Cloud dependencies

Playback runs entirely on your local machine. No account. No telemetry. Your credentials and system state stay on your network — only cover-art and radio-catalogue lookups query public metadata services.

Where it sits

Five layers.
Audiogravi^ty is two, drives three.

A streaming system is a stack. Audiogravi^ty does not compete with audio engines like MPD, Roon Bridge or HQPlayer — it orchestrates them, installs and configures them, and tunes the OS underneath.

User Interface

Browser · phone · tablet · PWA

Audiogravi^ty

Control / Orchestration

Source switching · transport · volume · UPnP renderer control · monitoring

Audiogravi^ty

Content Sources

NAS · Qobuz · Tidal · HIGHRESAUDIO · Internet radio · MinimServer

Audiogravi^ty manages

Audio Engine

MPD · Roon Bridge · HQPlayer Embedded · HQPlayer NAA · AirPlay · upmpdcli · UPnP renderers

Audiogravi^ty manages

OS / Kernel

RT scheduling · CPU pinning · IRQs · ALSA

Audiogravi^ty tunes

The takeaway: Audiogravi^ty owns the interface and orchestration layers, installs, configures and drives the audio engines audiophiles already trust (MPD, upmpdcli, AirPlay, HQPlayer Embedded, the HQPlayer NAA + DSP, Roon, network UPnP renderers), connects the content sources they rely on (NAS, Qobuz, Tidal, HIGHRESAUDIO, internet radio, MinimServer), and tunes the OS kernel underneath — without replacing or hiding any of them.

Board and software

A streamer is a board
and a software layer.

Network streamers sell for anywhere between a few hundred and several tens of thousands of euros. For the part that makes one a streamer — receiving, decoding, handing the result to a DAC — it is a board running Linux with a software layer on top. That layer is, most of the time, the one Audiogravi^ty drives: ALSA, MPD, upmpdcli, Shairport-Sync.

Check it yourselfThose components are licensed under the GPL, which obliges the manufacturer to declare them. The “open source licences” page in your machine's manual or web interface lists them.
Yours to chooseNothing here has to be built: a Raspberry Pi, a fanless mini-PC, an Intel Mac mini with Linux on it — a DAC you like, and you have a streamer. The DAC, the power supply, the clocks are simply not Audiogravi^ty's ground — they are yours. A finished box hands you the whole chain as one decision; this way you change one stage at a time, and only when you want to.
Where a box agesThe software is usually where a finished machine is weakest — a closed application, no Roon, no HQPlayer, rarely all three streaming services — and it stops evolving the day the model leaves the catalogue.
Where this one doesn'tMPD is over twenty years old, ALSA close to thirty, and both are still developed today. Your machine will not be abandoned because a manufacturer changed its range.

How it compares

One orchestrator.
Every audiophile engine.

Audiogravi^ty is a streamer, and so are most of the columns below — the table shows where each one stops. What sets it apart is that it does not ask you to choose against Roon or HQPlayer: it installs Roon Bridge to be a Roon endpoint, and HQPlayer NAA to be an HQPlayer endpoint — or HQPlayer Embedded itself, running on the box — so both keep working inside it. JPLAY iOS is listed for what it is: a control point, not a streamer.

Capability	Audiogravi^ty	Roon	Volumio	Moode	HQPlayer	JPLAY iOS
Product nature	Streamer (orchestrates audio engines)	Streamer + cloud platform	Streamer	Streamer	Streamer (DSP focus)	Controller only
Multi-engine orchestration (MPD + Roon + HQPlayer + AirPlay)		partial	partial	partial	—	partial (HQPlayer)
Native Tidal, Qobuz & HIGHRESAUDIO streaming (official APIs)			(Premium)	partial (via upmpdcli)	—	—
UPnP MediaServer browse & search (NAS via MinimServer, upmpdcli — results directly playable)					—
UPnP MediaRenderer control	control point	—	—	—	—
UPnP MediaRenderer (controllable from JPLAY / BubbleUPnP…)	via upmpdcli	partial (RAAT)			—	—
Roon Bridge integration		native			—	—
HQPlayer integration	DSP remote + NAA	as endpoint	—	—	native
AirPlay receiver					—	—
System tuning for audio (FIFO, MEMLOCK, CPU affinity)		—	—	—	—	—
Latency measured in microseconds (cyclictest, from the interface)		—	—	—	—	—
Live signal-path visualization		partial	—	—	—	—
Audio config editor (diff + automatic backup)		—	partial	partial	—	—
Per-source bit-perfect lock (DSD volume protection)		partial	—	—		partial
Internet radio (Radio Browser + custom stations)					—
PWA / web-installable		—	partial	partial	—	—
WebAuthn / biometric login		—	—	—	—	—
Self-hosted (no cloud account)		account required
Platform	Linux server · iOS / Android PWA + browser UI	Multi-OS (native apps)	Linux server · browser UI + native apps	Linux server · browser UI	Linux server	iOS only
Pricing model	Free (Starter) / €49 lifetime (Pro)	$14.99 / month or $829.99 lifetime	Free / Premium €69.99 / year	Free	€265 lifetime	$49.99 / year or $199 lifetime

supported · partial = limited · — not available. Comparison based on public information from each vendor's documentation as of 2026.

Mobile · PWA · WebAuthn

An app on your phone.
Without an app store.

Audiogravi^ty isn't just a web interface — it's a Progressive Web App, installable from Safari or Chrome to your home screen. Full-screen, dedicated icon, biometric login, push notifications when a service falls over.

Install in one gesture. Unlock with your face.

From Safari (iOS) or Chrome (Android), add Audiogravi^ty to your home screen. The app opens full-screen, without browser chrome, with its own icon. After a first password login, register a passkey on the device — every subsequent login is Face ID, Touch ID, fingerprint or YubiKey. Set up over a secure connection, the box now proves who it is. One approval per device — phone, tablet or computer — and the warnings stop for good: your browser treats it like any trusted site, which is what lets the app claim its own icon and open full-screen.

ScanThe installer ends with a QR code of your box's address — nothing to type on a phone

InstallSafari / Chrome → Add to Home Screen → full-screen PWA

LoginFace ID, Touch ID, Android fingerprint, Windows Hello, YubiKey

Multi-deviceSeveral passkeys per user, managed one-by-one in your profile

PushNotification when a service fails, the CPU hits the critical temperature or an update is available — even with the app closed

Touch targetsWCAG 2.1 AA · 44 px minimum · responsive layout

Editions & license

Two editions.
Lifetime license.

Audiogravi^ty comes in two editions: the Starter Edition, free, and the Pro License, a lifetime license that permanently unlocks every feature on one machine. Every install starts with thirty days of Pro, so you can try it all before you choose.

The interface is open source (MIT) — fork it, contribute, or build on it. The core engine remains proprietary.

Trial · included

30 days of Pro, on every install

Full access to every feature from the first start. No action required: the days remaining are shown in Admin › License, and after thirty days the box moves to the Starter Edition on its own.

Start trial

Starter Edition

€0

Free · forever · unlimited

Activates automatically when the trial expires — no action required. Everything you need to run and monitor your audio system. Includes all v1.x updates.

Profiles — one-click chain switching

Services — live monitoring · start / stop / restart

Software — install · update · simulate

System — hardware dashboard + audio inventory

Users — Admin / User / Guest roles

Audio Services Config — safe in-place editing + diff

Guided provisioning — set the audio stack up in a few clicks

·Pro features locked

Get started

Pro License

€49

Lifetime · 1 machine

Permanently unlocks every Pro feature. Bound to one installation. Includes all v1.x updates. Pro holders get a preferential upgrade price for new major versions.

Audio Pipeline — interactive map, hot rerouting

Player — unified transport across all sources

Library — Roon · MPD · UPnP · Qobuz · Tidal · HIGHRESAUDIO

Audio priority — FIFO / RR · affinity · MEMLOCK

Performance — cyclictest · RT monitor · iPerf3

Buy now

Platform

Debian 13 (Trixie) or later — DietPi and Raspberry Pi OS included, in their Trixie release — on x86_64 and Raspberry Pi (aarch64). The core installer turns any other system down. License is bound to the device — moving to another one requires a license reset, available on request.

Who I am

I designed Audiogravi^ty for my own system — MPD, Roon, and HQPlayer connected to a Heed Abacus, a Naim NAC 52 / NAP 250 setup, and ATC SL20 speakers. I develop and maintain it myself, from France. — Alexandre Di Marco

01 Pay with PayPal Buy now above, or Admin › License in the app. €49 lifetime.

02 Receive your key License key delivered by email within seconds. Order code unique to you.

03 Activate device Click "License Key", enter the key, confirm. The signed .lic file is bound to your device.

04 Listen All features immediately available. No restart, no logout. No subscription.

What's next

What comes next.
Nothing is settled yet.

The V1 scope is complete, and none of what follows belongs to it. These are some of the directions on the table — the list is not closed, none of them is promised, and the order is not fixed. What owners ask for is what decides it.

Ready-to-flash imageAudiogravi^ty as a complete system image, instead of an install onto a system you set up first.
DirettaThe transport protocol, alongside the HQPlayer NAA already supported.
AirPlay sendingSending to AirPlay devices, not only receiving from them.
MultiroomThe same music, in step, in more than one room.

If one of these matters more to you than the others, say so — open an issue or write to [email protected].

Installation

One command,
and it is a streamer.

No compilation, no dependency hell, no manual configuration. The installer detects your architecture, generates security keys, configures the systemd service and starts everything. Then install your audio engines in one click from the interface (MPD, AirPlay, UPnP…) and let the guided setup wire your DAC and music library. A few minutes from curl to listening.

RecommendedDietPi (Trixie) on x86_64 or Raspberry Pi (aarch64)
SupportedDebian 13 (Trixie) or later — DietPi and Raspberry Pi OS in their Trixie release
AccessAny browser on your network — phone, tablet, laptop
NetworkLocal only. Your data never leaves your home.
Trial30 days full access · auto-activated on first run
UpdatesOne-click from the UI — no terminal, no re-running the installer

DietPi

Recommended

Raspberry Pi

aarch64

Debian 13+

x86_64

# All-in-one — core + ui, works on your LAN curl -fsSL https://audiogravity.app/install.sh | sudo bash # Then open in your browser: https://<ip-of-your-streamer>

# Optional — passkeys (Face ID / Touch ID) + push. # Only if AG is reachable via a public HTTPS domain: curl -fsSL https://audiogravity.app/install.sh \ | sudo bash -s -- \ --public-url https://your-domain \ --vapid-email [email protected]

Audiogravity

From the machineto your Qobuz, Tidal & HIGHRESAUDIO library.

Unified transport across every engine

Auto-discovery

High-resolution library

Internet radio without a parallel signal path

HQPlayer — on the box, or on your network

One-tap profile scenarios

UPnP Control Point — play to any renderer

Push notifications

Give your music its own CPU cores

Measure the stability, don't assume it

Full speed where it plays, quiet elsewhere

Set up and edit audio service configs without breaking them

Live signal-path visualisation

Service tile + live sparklines

Complete audio device inventory

WebAuthn passkeys

One-click self-update, with automatic rollback

Every device.Every connection. Live.

End the jitter.

What you control, per service

SSE telemetry, peak

Cyclictest max latency

Cloud dependencies

Five layers.Audiogravity is two, drives three.

A streamer is a boardand a software layer.

One orchestrator.Every audiophile engine.

An app on your phone.Without an app store.

Install in one gesture. Unlock with your face.

Two editions.Lifetime license.

Common questions.

What comes next.Nothing is settled yet.

One command,and it is a streamer.

Audiogravi^ty

From the machine
to your Qobuz, Tidal & HIGHRESAUDIO library.

Every device.
Every connection. Live.

Five layers.
Audiogravi^ty is two, drives three.

A streamer is a board
and a software layer.

One orchestrator.
Every audiophile engine.

An app on your phone.
Without an app store.

Two editions.
Lifetime license.

What comes next.
Nothing is settled yet.

One command,
and it is a streamer.