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looking-glass.io

Looking Glass is open-source software for responsive, low-latency display and input.

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What is Looking Glass?

Looking Glass is open-source software that brings a Windows desktop into a window on a Linux machine, so you can use Windows applications without switching monitors, keyboards or mice. Its focus is a responsive, low-latency picture with sharp visuals and input that feels immediate, rather than remote-desktop-style lag.

It is distributed under the GPL 2.0 licence, originally released by Geoffrey McRae of HostFission, and published on GitHub with versioned builds. The project offers stable, release-candidate and development builds, plus documentation covering installation, configuration, usage, troubleshooting and FAQs. It also has a public community through a forum, Discord and GitHub, and reports over 208,000 total downloads.

Who it suits

  • Linux users who need Windows occasionally or continuously — for example, a developer on Linux who must run a Windows-only tool, or someone running games and creative software that only exists on Windows.
  • People who want one desk setup — no second monitor, keyboard or mouse, and no KVM switching.
  • Users comfortable with some setup — the project is aimed at those willing to follow documentation and tune a configuration, not a plug-and-play consumer app.

Main trade-offs

Aspect What it means
Latency and responsiveness The core design goal is low-latency display and input, which is why it is often chosen over general remote desktop tools.
Setup effort It requires a Windows host component and configuration; expect to read the documentation rather than install and forget.
Hardware and configuration Community discussion centres on hardware and configurations, suggesting results depend on your setup.
Licence GPL 2.0, so it is free to use and inspect, with source available.
Build channels Stable, release-candidate and development builds let you choose between reliability and newer changes.

A practical next step

If you are deciding whether to try it, start with the documentation to check your Linux distribution, Windows version and hardware against the installation and configuration guidance, then choose the stable build for a first test. If it works, keep the community links handy for hardware-specific tuning; if you need a quick comparison, general-purpose remote desktop tools are simpler to set up but typically less responsive for interactive work.

How do I install Looking Glass on my Linux system?

Looking Glass is installed on the Linux side as a client application, while the Windows side runs a host component. The Linux client is the part you install on your Linux system; the Windows host and the IDD (Indirect Display Driver) are set up inside the virtual machine. The project publishes stable, release-candidate and development builds through its own build system, and the documentation covers installation, configuration, usage and troubleshooting.

What to expect on Linux

  • The Linux client is the program that displays the Windows desktop in a window.
  • It relies on a virtual machine with GPU passthrough, so your Linux machine needs a working virtualisation setup before Looking Glass itself is useful.
  • Builds are versioned and produced with each release, so pick the build channel that matches how much risk you want: stable for daily use, development for newer features.
  • The licence is GPL 2.0, and the source is published on GitHub.

A practical installation path

  1. Confirm your virtual machine is already running Windows with the required passthrough configuration.
  2. Install the Windows host and IDD inside the guest, following the official documentation rather than improvising.
  3. Install the Linux client from the project's published builds, or build it from source if you prefer.
  4. Launch the client and connect it to the host, then tune resolution and input settings.

Where to get help

Start with the official documentation for installation and troubleshooting steps, then use the community channels if your hardware or configuration is unusual. The project offers a public forum, Discord and GitHub for questions and contributions.

Looking Glass

What hardware and GPU configurations are required to run Looking Glass?

Looking Glass does not have one fixed hardware list. Its requirements depend on the configuration you choose, because the software is built around passing a Windows desktop from a host machine to a client window over a low-latency connection. The project's own page presents it as open-source software for responsive display and input, with downloads, documentation and community support, but the page evidence does not spell out a single minimum GPU specification.

The practical split

Role What it does What matters most
Host Runs Windows and captures its display A GPU that can support the capture method you choose, plus the guest/Windows setup
Client Runs Linux and displays the Windows desktop in a window A GPU capable of driving your Linux display and handling the incoming stream smoothly
Input Passes keyboard and mouse between systems Compatible input devices and a working client/host connection

Typical configurations people use

  • A Windows host with a discrete GPU, paired with a Linux client on a separate machine.
  • A single machine running Linux with Windows in a virtual machine, using GPU passthrough so Windows has direct access to a graphics card.
  • A setup where the Windows host uses an indirect display driver rather than a physical monitor, which the project references in its downloads section.

What to check before committing

  1. Confirm your GPU supports the capture or passthrough method you intend to use.
  2. Check that your Linux client can drive the resolution and refresh rate you want.
  3. Review the project's documentation for installation, configuration and troubleshooting, since hardware compatibility varies by setup.

For a concrete example: if you have a desktop with two GPUs, one can be assigned to a Windows virtual machine while the other runs Linux, and Looking Glass displays that Windows session in a Linux window. If you only have integrated graphics, the same approach may not work without additional hardware.

A useful next step is to read the official documentation and community discussions for your specific GPU model before buying anything, because the project's page does not list a universal hardware requirement. Start at Looking Glass and then check the linked documentation and community resources.

Can I use Looking Glass with a single monitor instead of a dedicated display?

Yes. Looking Glass is designed to bring a Windows desktop into a window on your existing Linux machine, so a second physical monitor, keyboard or mouse isn't required. The page's own framing is "Use Windows without leaving Linux," and it explicitly says you can "keep your workflow together without dedicating another monitor, keyboard or mouse."

How single-monitor use actually works

The typical setup is a Linux host running a virtual machine with a Windows guest. Looking Glass presents that guest's output in a resizable window on the Linux desktop, and forwards your input to it. You switch between Linux and Windows by focusing windows, not by switching monitor inputs.

Practical consequences for a one-screen setup:

  • Screen real estate is the real constraint. A single display means Linux and Windows share pixels. Full-screen the Looking Glass window when you need Windows, or keep it windowed alongside Linux apps.
  • Input capture matters more. Since you're sharing one keyboard and mouse, you'll rely on the client's input handling and a release key or hotkey to hand control back to Linux. The project's documentation covers configuration and usage, so check there before assuming defaults suit you.
  • Image quality and latency are the selling points. The page highlights "responsive by design" and "high-quality picture," which is exactly what you want when a Windows session shares a screen with your normal work.

What you still need

A single monitor doesn't remove the hardware requirements of the underlying virtual machine. You still need a Linux host capable of running Windows with GPU passthrough or a suitable virtual display, plus the guest-side components. The page references a "Windows Host + IDD" path and points to downloads, documentation and a public forum, Discord and GitHub for configuration questions.

For a concrete scenario: a developer on one ultrawide monitor keeps a Linux terminal and browser open and runs a windowed Windows session for a Windows-only tool, switching focus rather than switching displays. That is the workflow Looking Glass targets.

Next step

Read the official installation and configuration documentation first, since the exact host/guest arrangement determines whether a single-monitor setup is smooth or awkward. Start at Looking Glass and follow the Documentation and Downloads links. If your hardware combination is unusual, ask in the project community before buying anything.

How does Looking Glass compare to a KVM switch or remote desktop for gaming and input latency?

Looking Glass is aimed at a different job than either a KVM switch or a remote desktop tool: it brings a Windows guest's desktop into a window on your Linux host, with the guest's own GPU doing the rendering and a shared-memory transport moving frames and input between them. That design is what the project means by "responsive by design" and "controls that feel immediate" Looking Glass.

Where each option sits

Approach What it does Typical latency profile Best for
Looking Glass Windows guest displayed inside a Linux window via a low-latency local transport Very low; frames and input stay on the same machine Gaming and daily work on a single-monitor dual-GPU setup
KVM switch Physically switches one monitor, keyboard and mouse between two machines Near-zero for input, but a visible re-sync delay when switching Two separate PCs you alternate between, no shared desktop
Remote desktop Streams a desktop over a network Highest; depends on encoder, network and client Accessing a machine from another room or another building

Gaming and input latency, concretely

For gaming, the deciding factor is the path your input takes. A KVM switch keeps input on real hardware, so it feels native, but you cannot see both systems at once and switching interrupts whatever is running. Remote desktop adds encode, network and decode stages, which is fine for office work and poor for fast aiming. Looking Glass sits between them: input and video stay local, so latency is dominated by the guest's own frame pacing rather than by a network hop. The trade-off is setup — it depends on a suitable GPU arrangement and a Windows host component, and the project points users to its documentation and community for hardware and configuration questions Looking Glass.

Which to pick

  • If you game on Windows and also work in Linux on the same machine, and you want one monitor, keyboard and mouse: Looking Glass is the closest fit.
  • If you have two independent PCs and only need to alternate between them: a KVM switch is simpler and adds no software layer.
  • If the machine you want to reach is somewhere else: remote desktop is the only one of the three that crosses distance.

A useful next step is to read the installation and troubleshooting docs before buying anything, since the hardware requirements are the part most likely to decide whether this works for you Looking Glass.

How can I troubleshoot common issues like black screen or input lag in Looking Glass?

Troubleshooting Looking Glass usually comes down to two areas: the Windows host side (the virtual display and capture) and the client side (the Linux window and input). The project documents installation, configuration, usage, troubleshooting and FAQs, so the official docs are the right first stop: Looking Glass.

Black screen or no picture

Work through these in order, since each one eliminates a different cause:

  • Confirm the Windows host is actually producing a picture. If the guest has no display output, the client has nothing to show. Check that the virtual display driver is installed and active on the Windows side.
  • Check the client is connecting to the right host and display. A mismatch between the configured host address and the running Windows machine is a common cause of a blank window.
  • Match versions. The project publishes stable, release-candidate and development builds and notes that versions are built with each release. Mixing a client from one build with a host component from another is a frequent source of failures; use matched builds from the project's download page.
  • Look at the client logs before changing settings. They usually tell you whether the problem is a connection failure, a capture failure, or a rendering failure — three different fixes.

Input lag or sluggish response

Looking Glass is described as responsive by design, so persistent lag generally points to configuration or resource contention rather than a limit of the software itself.

  • Give the virtual machine enough CPU headroom. Capture and encode work competes with the guest's own workload; an overcommitted host shows up as input delay.
  • Reduce the capture resolution or frame rate temporarily. If lag drops noticeably, you have found the bottleneck and can tune upward from there.
  • Check the input path. Input is passed through to the Windows guest, so a problem in the host-to-guest input configuration can feel like display lag even when the picture is fine.
  • Separate network lag from rendering lag. If you run the client over a network rather than locally, latency may come from the link, not from Looking Glass.

When to ask the community

If matched builds, verified host output and reduced settings still leave you stuck, the project points to a public forum, Discord and GitHub for hardware and configuration questions. Include your build version, host and guest GPU, and whether the issue is black screen or lag — that detail is what makes an answer possible.

A practical first step: note your exact build and whether the problem appears immediately or after some minutes of use. Immediate failure usually means configuration or version mismatch; delayed failure usually means a resource or thermal limit. That single observation narrows the search considerably.

Related questions

More questions →
What Are Open-Source UI Element Libraries and How Do They Differ From UI Frameworks?

An open-source UI element library is a collection of individual, ready-made interface pieces—buttons, cards, inputs, toggles, loaders—that you copy into your own project and adapt. A UI framework, by contrast, is a structured system of components, conventions, and often a theming layer that governs how your whole interface is built. The practical difference: an element library gives you a snippet; a framework gives you a way of working. If you need a polished button in ten minutes, reach for the element library. If you're building a 40-screen product with a team, you probably want the framework.

What "open-source UI element library" actually means

The term gets used loosely, so it helps to separate the parts:

  • Open-source: the code is publicly available, and the license tells you what you may do with it—copy, modify, redistribute, or use commercially.
  • UI element: a single, self-contained piece of interface, usually small enough to read in one sitting. A button with hover states, a pricing card, a search field.
  • Library: a browsable, searchable collection of those elements, typically contributed by many different people.

On a site like Uiverse, elements are shared by a community and written in plain CSS or Tailwind. You find one you like, copy the markup and styles, paste them into your project, and adjust colors, spacing, and text to fit. There's no package to install and no build step required—which is exactly the appeal, and also the source of most of the confusion.

Element library vs. UI framework: the core differences

Dimension Open-source UI element library UI framework / design system
Unit of reuse A single snippet you copy A component you import or call
Installation None; paste into your code Package install, config, sometimes a provider
Consistency Depends on you; each element may look different Enforced by shared tokens and APIs
Theming Manual edits per element Central theme/config file
Updates You own the copy; no upstream updates Version bumps bring fixes and changes
Accessibility Varies per contributor; must be checked Usually tested and documented
Best for Prototypes, landing pages, small sites, one-off needs Multi-page apps, teams, long-lived products
Learning curve Low—read the CSS Higher—learn the API and conventions

The table isn't a verdict. It's a map of trade-offs. Element libraries win on speed and freedom; frameworks win on consistency and maintenance.

Licensing and attribution: what to check before you paste

This is where people get into trouble, and it's worth slowing down for.

  1. Find the license. Every element or collection should state one. Common open-source licenses include MIT, Apache-2.0, and BSD. Some projects use copyleft licenses like GPL, which can impose obligations if you redistribute your code.
  2. Understand what the license permits. MIT and Apache-2.0 are permissive: you can typically use the code in commercial and closed-source projects. Copyleft licenses may require you to release derivative source under the same terms.
  3. Check attribution requirements. Permissive licenses usually require you to keep the copyright notice and license text somewhere in your project. That's a real obligation, not a formality.
  4. Look for per-element terms. On community sites, the site's overall terms and the individual contributor's stated wishes may differ. If a contributor asks for credit, honor it.
  5. When in doubt, ask or avoid. If a snippet has no license at all, you don't have clear permission to reuse it. Treat "no license" as "not open source," even if the code is publicly visible.

This article is general information, not legal advice. For commercial products with real exposure, have someone qualified review the licenses you're relying on.

How to use a community element in your project: a practical workflow

Here's a repeatable process that avoids most of the usual mess.

1. Start from a real need, not a browsing session

Decide what you need first—"a compact primary button with a loading state"—then search. Browsing aimlessly produces a pile of pretty snippets that don't fit together.

2. Copy the smallest version that works

Take the markup and the styles. Strip anything you don't need: demo wrappers, extra animations, decorative layers. Less code means fewer surprises.

3. Convert it to your conventions

If your project uses design tokens or CSS variables, replace hard-coded values:

/* Before: hard-coded */
.button { background: #4f46e5; border-radius: 8px; }

/* After: token-based */
.button { background: var(--color-primary); border-radius: var(--radius-md); }

This one step is what keeps a copied element from looking like a foreign object in your UI.

4. Check accessibility before you ship

Community elements vary widely here. Verify at minimum:

  • Keyboard focus is visible and the element is reachable by Tab.
  • Color contrast meets WCAG AA (4.5:1 for normal text).
  • Interactive elements use semantic HTML (<button>, not a clickable <div>).
  • Form inputs have associated labels.
  • Motion respects prefers-reduced-motion.

5. Test in context

Paste it into a real page with real content. Long labels, small screens, and dark mode break more copied elements than anything else.

6. Note where it came from

Keep a short comment or an internal credits file: source, license, date. Future you—and your legal reviewer—will be grateful.

Where element libraries genuinely shine

  • Prototypes and demos: you need something clickable today, not a design system.
  • Landing pages and marketing sites: a handful of distinctive elements, each custom.
  • Filling gaps: your framework lacks one specific component, and you don't want to build it from scratch.
  • Learning: reading well-made CSS is one of the fastest ways to improve.
  • Small projects: a personal site doesn't need a theming architecture.

Where they fall short

  • Consistency at scale: ten elements from ten contributors rarely look like one product.
  • Maintenance: you own every copy. When your design changes, you edit each one.
  • Accessibility debt: you inherit whatever the contributor did or didn't do.
  • No upstream fixes: a bug fixed in the original won't reach your copy.
  • Integration friction: different naming conventions, different units, different assumptions about resets.

When to choose which

Choose an element library when the scope is small, the timeline is short, or you need a few distinctive pieces rather than a whole system.

Choose a framework or design system when multiple people build multiple screens over months, when consistency is a product requirement, or when accessibility and theming need to be guaranteed rather than checked.

A hybrid works well for many teams: adopt a framework for the structural components—forms, navigation, layout—and borrow individual elements for the places where you want personality. Just route every borrowed element through the same token and accessibility checks, so it lands as part of your system rather than beside it.

The short version: open-source UI element libraries are a fast, flexible way to get good-looking interface pieces into a project. They are not a substitute for a design system, and the license and accessibility details are the part worth reading carefully.

Website Overview

An established domain and managed infrastructure suggest continuity of operations and may support dependable delivery, although neither guarantees service quality. Page metadata, canonical configuration and social previews work together to provide more consistent search and sharing presentation.

Domain and Registration

Registered in 2020, this domain has about 6 years of history. That suggests continuity, although ownership and purpose may have changed. Transfer-protection status is present, helping reduce the risk of unauthorized domain transfers. The registrar is Cloudflare, Inc, a widely used domain service provider. The domain uses the common .io extension, which is not an independent safety signal.

DNS and Email

Nameservers are provided by Cloudflare, indicating managed DNS hosting. No CNAME was found; the observed records resolve directly to addresses. No MX record was found. A conventional explicit inbound-mail route is not configured. TXT records include verification markers for Google. Such markers may also remain after a service stops being used. DNSSEC signatures were not detected, so this additional DNS authenticity protection is not confirmed.

TLS and Certificates

The public key uses EC with 256 bits. The server supplied a complete certificate chain. No organization name is present in the certificate; the available fields are consistent with domain validation. The certificate was issued within the Google Trust Services cloud or CDN ecosystem. The certificate's total validity is about 90 days, consistent with a short renewal cycle.

HTTP and Browser Security

No X-Powered-By header was found, reducing one common source of backend fingerprinting information. All six checked browser-security headers are present. Their effectiveness still depends on the policy values and application behavior. The cf-ray response header indicates a CDN or caching proxy in the delivery path. No obvious internal addresses or debug information were found in the headers. The Server header identifies cloudflare without an exact version.

Technology Stack Analysis

The public page identifies WMS by HostFission - https://hostfission.com, Bootstrap, Google Analytics, Cloudflare without precise versions, leaving fewer clues for version-specific scanning.

Search and Social Sharing

The Generator tag identifies WMS by HostFission - https://hostfission.com, making the publishing system easier to fingerprint. Twitter Card metadata is configured. The title has 20 characters, within a common display range. A meta description is present, with 84 characters. The observed directives allow indexing and link following.

Hosting and Email
DNSCloudflare
HostingCloudflare
EmailUnknown
Approximate IP geolocation (inferred; a CDN or proxy may differ from the origin server) Location unknown Inferred 104.21.5.8

Registration details

RDAP / WHOIS

RegistrarCloudflare, Inc
Registered2020-10-24
Expires2027-10-24
Domain statusclientTransferProhibited https://icann.org/epp#clientTransferProhibited
Nameserversjack.ns.cloudflare.com、jean.ns.cloudflare.com
DNSSECunsigned

DNS records

DNS

TypeNameValueTTLPriority
Alooking-glass.io104.21.5.8300—
Alooking-glass.io172.67.132.180300—
AAAAlooking-glass.io2606:4700:3032::6815:508300—
AAAAlooking-glass.io2606:4700:3037::ac43:84b4300—
NSlooking-glass.iojack.ns.cloudflare.com86400—
NSlooking-glass.iojean.ns.cloudflare.com86400—
TXTlooking-glass.iogoogle-site-verification=xTGp5X8Wq3QytupLyY8-o-4nwcvK6-0Rlm6NQrlwQXU300—
TXTlooking-glass.iov=spf1 mx a -all300—
DMARC_dmarc.looking-glass.iov=DMARC1; p=reject; rua=mailto:[email protected]; adkim=s; aspf=s;300—

TLS and certificates

TLS / SSL

AssessmentNormal configuration
Supported protocolsTLSv1.2、TLSv1.3
Negotiated protocolTLSv1.3
Certificate subjectlooking-glass.io
IssuerGoogle Trust Services
Valid until2026-11-17T19:58 · Remaining when checked: 48 days
Verification detailsCertificate trust: Passed · Hostname match: Passed

HTTP response headers

HTTP

HeaderValue
content-typetext/html; charset=UTF-8
servercloudflare
strict-transport-securitymax-age=0; includeSubDomains; preload
content-security-policyupgrade-insecure-requests
x-frame-optionsSAMEORIGIN
x-content-type-optionsnosniff
referrer-policystrict-origin-when-cross-origin
permissions-policycamera=(), geolocation=(), microphone=()

Identified technologies
WMS by HostFission - https://hostfission.comBootstrapGoogle AnalyticsCloudflare

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Meta descriptionLooking Glass is open-source software for responsive, low-latency display and input.
Canonical URLhttps://looking-glass.io/
LanguageEnglish (default)
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