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<!doctype html>
<html lang="en" data-theme="dark">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>18-LAB · performance-engineered osu! tooling</title>
<meta
name="description"
content="18-LAB builds osu! tooling engineered for performance and power users: vosu, the native telemetry daemon, the official vosu-tools that put its live data to work, and vosulay, the in-game overlay manager."
/>
<link rel="icon" type="image/svg+xml" href="/favicon.svg" />
<script>
document.documentElement.dataset.theme = localStorage.getItem("18lab-theme") ?? "dark";
</script>
<script type="module" src="/src/landing.ts"></script>
</head>
<body>
<div data-shell="header"></div>
<main>
<!-- SHEET 00 · INDEX -->
<section class="hero" data-draw aria-labelledby="hero-title">
<div class="hero-crosshair" aria-hidden="true">
<span class="ch-x"></span><span class="ch-y"></span><span class="ch-label mono"></span>
</div>
<div class="wrap hero-grid">
<div class="hero-copy">
<p class="hero-kicker mono">
<span class="accent">18 / Laboratory</span><span class="muted">Sheet 00 · Index · Rev A</span>
</p>
<h1 id="hero-title" class="wordmark">
<span class="visually-hidden">18-LAB</span>
<span class="wm-guide wm-guide--cap mono" aria-hidden="true">Cap</span>
<span class="wm-guide wm-guide--base mono" aria-hidden="true">Base</span>
<span class="wm-text" data-wordmark aria-hidden="true"></span>
</h1>
<p class="statement">osu! tooling, engineered and measured.</p>
<p class="lede">
We build the daemon that reads the game, the tools that put its live data to work, and the overlay manager
that draws inside it. Native Rust, Linux first-class, and every performance claim published with its method.
</p>
<div class="hero-actions">
<a class="btn btn--primary mono" href="/vosu/guide/install.html"><span class="idx">01</span>Get vosu<span class="arrow">→</span></a>
<a class="btn mono" href="/vosulay/install.html"><span class="idx">02</span>Get vosulay<span class="arrow">→</span></a>
<a class="btn mono" href="/vosu/guide/tools.html"><span class="idx">03</span>Get tools<span class="arrow">→</span></a>
</div>
</div>
<figure class="hero-fig">
<div class="fig-frame reg" data-fig></div>
<figcaption class="fig-caption mono">
<span><span class="accent">FIG.01</span> Mark · construction</span>
<span class="muted">Ø 464 ref · 3° graduations</span>
</figcaption>
</figure>
</div>
<div class="wrap">
<dl class="readout mono">
<div><dt>Cursor</dt><dd data-cursor>X 0000 · Y 0000</dd></div>
<div><dt>Local</dt><dd data-clock>--:--:--</dd></div>
<div><dt>Builds</dt><dd>vosu 1.2.0 · vosulay 1.5.0</dd></div>
<div><dt>Targets</dt><dd>osu!stable · osu!lazer</dd></div>
<div><dt>Status</dt><dd><span class="status-dot" aria-hidden="true"></span>Nominal</dd></div>
</dl>
</div>
</section>
<!-- SHEET 01 · ROUTE -->
<section id="route" class="sheet" data-draw aria-labelledby="route-title">
<div class="wrap">
<header class="sheet-head mono">
<span class="sheet-no">Sheet 01</span><span class="sheet-rule"></span><span class="sheet-title">Route</span
><span>18-LAB / IDX / 001</span>
</header>
<div class="section-intro">
<h2 id="route-title">Live data,<br />put to work.</h2>
<p>
vosu reads osu! as you play and hands that live state to everything around it: overlays on stream, vosulay
in game, and tools that work with the map you have selected. Preview it live with your skin, see its pp on
other servers, make practice maps at new rates, rate mania charts section by section, render replays.
Select a stage to open its dossier.
</p>
</div>
<div class="route">
<div class="route-map reg" data-route-map></div>
<aside class="dossier" data-dossier aria-live="polite"></aside>
</div>
</div>
</section>
<!-- SHEET 02 · MEASURE -->
<section id="measure" class="sheet" data-draw aria-labelledby="measure-title">
<div class="wrap">
<header class="sheet-head mono">
<span class="sheet-no">Sheet 02</span><span class="sheet-rule"></span><span class="sheet-title">Measure</span
><span>vosu 1.2.0 · 1.1.0 / tosu 4.26.2</span>
</header>
<div class="section-intro">
<h2 id="measure-title">Measured,<br />not claimed.</h2>
<p>
Less of your PC goes to reading the game and more to playing it. On live osu! clients, vosu used about a
third of tosu’s memory on Windows, under a sixth on Linux, and less CPU in every run. The narrowest margin is
listed alongside the widest.
</p>
</div>
<div class="readouts" data-readouts></div>
<figure class="chart reg" data-chart>
<figcaption class="chart-head">
<span class="mono"><span class="accent">FIG.02</span> Reading one game update · <span class="unit">µs</span> · lower is better</span>
<span class="chart-legend mono">
<span><i class="sw sw--tosu"></i>tosu 4.26.2</span><span><i class="sw sw--vosu"></i>vosu</span>
</span>
</figcaption>
<div class="chart-body" data-chart-body></div>
</figure>
<p class="footnote mono">
Source: vosu benchmark guide, released tosu comparison. Windows stable: vosu 1.2.0, 2026-10-25. Linux: vosu
1.1.0, 2026-10-17, retained for 1.2.0. One 25-minute map in Autoplay, matched settings; memory and CPU with
both programs running. Windows lazer was not measured for 1.2.0.
<a href="https://github.com/18-lab-dev/vosu/blob/main/docs/testing/benchmarks.md#released-tosu-comparison">Conditions and full tables</a>.
</p>
</div>
</section>
<!-- SHEET 03 · CAPABILITY -->
<section id="capability" class="sheet" data-draw aria-labelledby="capability-title">
<div class="wrap">
<header class="sheet-head mono">
<span class="sheet-no">Sheet 03</span><span class="sheet-rule"></span><span class="sheet-title">Capability</span
><span>What you can do</span>
</header>
<div class="section-intro">
<h2 id="capability-title">Your overlays,<br />and then some.</h2>
<p>Switching from tosu keeps the overlays you already use. Here is what else vosu does with your game.</p>
</div>
<ol class="caps">
<li>
<span class="caps-no mono">C-01</span>
<h3>Your overlays, unchanged</h3>
<div>
<p>
Overlays made for tosu, gosumemory or StreamCompanion keep working at the same address, and the dashboard
installs more from the tosu community catalog.
</p>
<p class="caps-tags mono"><span>Compatibility</span></p>
</div>
</li>
<li>
<span class="caps-no mono">C-02</span>
<h3>stable and lazer</h3>
<div>
<p>
Reads osu!stable and osu!lazer on Windows, and osu!lazer natively on Linux. osu!stable through Wine is
supported experimentally.
</p>
<p class="caps-tags mono"><span>Windows</span><span>Linux</span></p>
</div>
</li>
<li>
<span class="caps-no mono">C-03</span>
<h3>In game, on Linux too</h3>
<div>
<p>
vosulay draws your overlays inside osu! on Windows and Linux: Vulkan or OpenGL, Wayland or X11, and
osu!stable under Wine. Move, resize and rotate them, and let layouts switch with the ruleset.
</p>
<p class="caps-tags mono"><span>vosulay</span><span>Windows</span><span>Linux</span></p>
</div>
</li>
<li>
<span class="caps-no mono">C-04</span>
<h3>Tools on the live game</h3>
<div>
<p>
One click each from the dashboard: practice maps at new rates, a live map preview with your skin, server
pp for the selected map, mania ratings, replay rendering, a skin studio, a beatmap downloader and your
lazer library.
</p>
<p class="caps-tags mono"><span>vosu-tools</span></p>
</div>
</li>
<li>
<span class="caps-no mono">C-05</span>
<h3>Settings profiles</h3>
<div>
<p>
Keep different settings for the same overlay, one for stream and one for practice, and pin a browser
source to the profile it needs.
</p>
<p class="caps-tags mono"><span>Overlays</span></p>
</div>
</li>
<li>
<span class="caps-no mono">C-06</span>
<h3>Short overlay URLs</h3>
<div>
<p>Give an overlay a nickname and a short URL such as <code>/acc/</code> to paste into OBS.</p>
<p class="caps-tags mono"><span>Overlays</span></p>
</div>
</li>
<li>
<span class="caps-no mono">C-07</span>
<h3>Across your network</h3>
<div>
<p>
Share overlays with another PC on your LAN or Tailscale while settings stay on this one. vosulay can serve
view-only layouts to browsers and streaming clients on your network.
</p>
<p class="caps-tags mono"><span>LAN</span><span>Tailscale</span></p>
</div>
</li>
<li>
<span class="caps-no mono">C-08</span>
<h3>Updates itself, safely</h3>
<div>
<p>
Installs new releases at startup, checks each download against its published SHA-256, and can roll back a
failed update. Linux packages update by installing the newer package.
</p>
<p class="caps-tags mono"><span>Updates</span></p>
</div>
</li>
</ol>
</div>
</section>
<!-- SHEET 04 · COMPARE -->
<section id="compare" class="sheet" data-draw aria-labelledby="compare-title">
<div class="wrap">
<header class="sheet-head mono">
<span class="sheet-no">Sheet 04</span><span class="sheet-rule"></span><span class="sheet-title">Compare</span
><span>vosu 1.2.0 / tosu 4.26.3</span>
</header>
<div class="section-intro">
<h2 id="compare-title">Side by side,<br />limits included.</h2>
<p>
tosu is the project vosu stays compatible with. Every tosu entry is checked against tosu’s own repository at
v4.26.3; the memory figures come from 18-LAB’s measured comparison against tosu 4.26.2. Where vosu falls short,
it says so.
</p>
</div>
<div class="versus-wrap reg">
<table class="versus">
<thead>
<tr><th scope="col" class="mono">Capability</th><th scope="col" class="mono">vosu</th><th scope="col" class="mono">tosu</th></tr>
</thead>
<tbody>
<tr>
<th scope="row">In-game overlay</th>
<td data-label="vosu"><strong>Linux and Windows</strong>, with vosulay</td>
<td data-label="tosu"><strong>Windows only</strong><sup><a href="#src-1">1</a></sup></td>
</tr>
<tr>
<th scope="row">Linux</th>
<td data-label="vosu"><strong>osu!lazer natively</strong>; osu!stable through Wine, experimental</td>
<td data-label="tosu"><strong>Linux build</strong>; stable tested with osu-winello, lazer with AppImage and Flatpak<sup><a href="#src-2">2</a></sup><sup><a href="#src-3">3</a></sup></td>
</tr>
<tr>
<th scope="row">osu!stable and osu!lazer</th>
<td data-label="vosu"><strong>Both</strong></td>
<td data-label="tosu"><strong>Both</strong><sup><a href="#src-2">2</a></sup></td>
</tr>
<tr>
<th scope="row">Existing overlays</th>
<td data-label="vosu"><strong>tosu, gosumemory and StreamCompanion</strong> overlays</td>
<td data-label="tosu"><strong>gosumemory and StreamCompanion</strong> compatible, plus its own API<sup><a href="#src-2">2</a></sup></td>
</tr>
<tr>
<th scope="row">Tools</th>
<td data-label="vosu"><strong>Installs and runs them</strong>: practice, map preview, server pp and more</td>
<td data-label="tosu"><strong>Not among its listed features</strong><sup><a href="#src-2">2</a></sup></td>
</tr>
<tr>
<th scope="row">Memory while playing</th>
<td data-label="vosu"><strong>48 MiB</strong> Windows stable · <strong>30 MB</strong> Linux lazer</td>
<td data-label="tosu"><strong>143 MiB</strong> · <strong>266 MB</strong><sup><a href="#src-m">M</a></sup></td>
</tr>
<tr>
<th scope="row">Automatic updates</th>
<td data-label="vosu"><strong>Yes</strong>, SHA-256-checked with rollback</td>
<td data-label="tosu"><strong>Yes</strong><sup><a href="#src-4">4</a></sup></td>
</tr>
<tr>
<th scope="row">Signed Windows downloads</th>
<td data-label="vosu"><strong>No</strong>: SmartScreen may warn</td>
<td data-label="tosu"><strong>Yes</strong>, through SignPath<sup><a href="#src-2">2</a></sup></td>
</tr>
<tr>
<th scope="row">macOS</th>
<td data-label="vosu"><strong>No</strong></td>
<td data-label="tosu"><strong>No</strong> macOS build<sup><a href="#src-3">3</a></sup></td>
</tr>
</tbody>
</table>
</div>
<ol class="sources mono">
<li id="src-1"><span>1</span><a href="https://github.com/tosuapp/tosu/blob/1d811dd90af00c7f0d8551a0735d9ce779a6e773/packages/ingame-overlay-updater/src/index.ts#L25-L29">tosu v4.26.3 · in-game overlay: “only available on the Windows platform”</a></li>
<li id="src-2"><span>2</span><a href="https://github.com/tosuapp/tosu/blob/1d811dd90af00c7f0d8551a0735d9ce779a6e773/README.md">tosu v4.26.3 · README: features, Linux notice, code signing</a></li>
<li id="src-3"><span>3</span><a href="https://github.com/tosuapp/tosu/releases/tag/v4.26.3">tosu v4.26.3 · release downloads: Linux and Windows</a></li>
<li id="src-4"><span>4</span><a href="https://github.com/tosuapp/tosu/blob/1d811dd90af00c7f0d8551a0735d9ce779a6e773/packages/common/utils/config.ts#L20-L21">tosu v4.26.3 · <code>ENABLE_AUTOUPDATE</code> setting</a></li>
<li id="src-m"><span>M</span><a href="https://github.com/18-lab-dev/vosu/blob/main/docs/testing/benchmarks.md#daemon-cpu-and-memory">vosu benchmark guide · daemon memory against tosu 4.26.2, both running</a></li>
</ol>
<div class="limits">
<h3 class="mono">Where vosu stops</h3>
<ul>
<li><span class="mono">L-01</span>Windows downloads are not code-signed yet, so SmartScreen may warn before the first launch.</li>
<li>
<span class="mono">L-02</span>Live osu!lazer on Windows was not tested for 1.2.0: lazer would not start on the
test machine. Its support passed tests against recorded game memory; reading a running lazer, lazer skins,
the tools’ lazer features and vosulay in lazer were verified on Linux only.
</li>
<li><span class="mono">L-03</span>osu!stable on Linux runs through Wine and is experimental, not release-verified.</li>
<li>
<span class="mono">L-04</span>Tools are not sandboxed: they run with your account’s permissions. Official tools
are trusted; others wait for your approval on the dashboard.
</li>
<li><span class="mono">L-05</span>In-game overlays come from vosulay, installed as a tool or on its own; vosu itself draws nothing in game.</li>
</ul>
</div>
</div>
</section>
<!-- SHEET 05 · START -->
<section id="start" class="sheet" data-draw aria-labelledby="start-title">
<div class="wrap">
<header class="sheet-head mono">
<span class="sheet-no">Sheet 05</span><span class="sheet-rule"></span><span class="sheet-title">Start</span
><span>Linux · Windows · open source</span>
</header>
<div class="section-intro">
<h2 id="start-title">Running in<br />three steps.</h2>
<p>Free and open source. Your existing overlays come along.</p>
</div>
<ol class="spec">
<li>
<span class="spec-no mono">S-01</span>
<h3>Install vosu</h3>
<div>
<p>A portable ZIP for Windows or Linux, or a .deb, .rpm or Arch package. It opens its dashboard when it starts.</p>
<p class="spec-actions">
<a class="btn btn--primary mono" href="/vosu/guide/install.html">Get vosu<span class="arrow">→</span></a>
<a class="btn mono" href="https://github.com/18-lab-dev/vosu/releases/latest">Releases<span class="arrow">→</span></a>
</p>
</div>
</li>
<li>
<span class="spec-no mono">S-02</span>
<h3>Add tools</h3>
<div>
<p>Open Tools in the dashboard and install the ones you want, one click each.</p>
<p class="spec-actions">
<a class="btn btn--primary mono" href="https://github.com/18-lab-dev/vosu-tools">Browse vosu-tools<span class="arrow">→</span></a>
<a class="btn mono" href="/vosu/guide/tools.html">Tools guide<span class="arrow">→</span></a>
</p>
</div>
</li>
<li>
<span class="spec-no mono">S-03</span>
<h3>Put it in game</h3>
<div>
<p>Install vosulay from the same Tools page, or download it as a standalone app.</p>
<p class="spec-actions">
<a class="btn btn--primary mono" href="/vosulay/install.html">Get vosulay<span class="arrow">→</span></a>
</p>
</div>
</li>
</ol>
<p class="dev-line mono">
Building overlays or tools? <a href="/vosu/dev/">Developer docs</a> · <a href="/vosu/dev/tutorial/">Overlay tutorial</a> ·
<a href="https://github.com/18-lab-dev/vosu/blob/main/docs/tools/create-a-tool.md">Create a tool</a>
</p>
</div>
</section>
</main>
<div data-shell="footer"></div>
</body>
</html>