Open Source Virtual Tour & 360° Panorama Libraries in JavaScript 2026

26. February 2026

Communication / Content Creation / Content Managment / Design / Development / Javascript

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Want to create stunning 360° virtual tours without dropping hundreds on commercial software like Ipanorama 360? You’re in luck! The open-source JavaScript ecosystem has some seriously impressive options that’ll make your virtual tours look professional without costing a dime.

Whether you’re building real estate walkthroughs, museum exhibitions, hotel showcases, or just want to display immersive panoramas on your website, there’s an open-source library that fits your needs. Let’s explore the best options available in 2026.

Quick Answer: For lightweight, simple panoramas, go with Pannellum (21KB, dead simple). For feature-rich virtual tours with hotspots and navigation, Photo Sphere Viewer is your best bet with 2.2k GitHub stars and a plugin ecosystem. Need VR capabilities? A-Frame by Mozilla is unbeatable.

What Makes a Great 360°/Virtual Tour Library?

Before diving into specific libraries, here’s what separates the good from the great:

Performance – Should load fast and run smoothly even on mobile devices
Equirectangular & Cubemap Support – Both standard 360° image formats
Hotspots/Annotations – Interactive points that users can click for more info
Tour Navigation – Link multiple panoramas together into a walkthrough
Mobile & VR Support – Touch gestures, gyroscope, and VR headset compatibility
Plugin Ecosystem – Extensible architecture for custom features

Best Open Source 360° Panorama Viewers

1. Pannellum – The Lightweight Champion

License: MIT
GitHub Stars: 4.7k
Size: 21KB gzipped
Maintenance: Stable, community-maintained

Pannellum is the go-to choice when you need a simple, fast-loading panorama viewer. At just 21KB, it’s smaller than most images on your website, yet it handles 360° images beautifully.

Why developers love it:

Incredibly small footprint – only 21KB gzipped
No dependencies – pure HTML5, CSS3, and JavaScript
Multi-resolution panoramas for huge images
Hotspot support for interactive elements
Tour mode to link multiple panoramas
Works in all modern browsers with WebGL
Self-hosted – just upload pannellum.htm and go

Perfect for:

Simple 360° image displays
Performance-critical websites
Basic virtual tours with hotspots
When you want zero dependencies

Getting started:


npm install pannellum

npm install pannellum

Basic usage:


<!DOCTYPE html>
<html>
<head>
  <link rel="stylesheet" href="https://cdn.pannellum.org/2.5/pannellum.css"/>
  <script type="text/javascript" src="https://cdn.pannellum.org/2.5/pannellum.js"></script>
  <style>
    #panorama { width: 600px; height: 400px; }
  </style>
</head>
<body>
  <div id="panorama"></div>
  <script>
    pannellum.viewer('panorama', {
      type: "equirectangular",
      panorama: "https://example.com/path/to/image.jpg",
      autoLoad: true,
      compass: true,
      title: "My Virtual Tour",
      author: "Your Name"
    });
  </script>
</body>
</html>

<!DOCTYPE html>

<html>

<head>

<style>

#panorama { width: 600px; height: 400px; }

</style>

</head>

<body>

pannellum.viewer('panorama', {

type: "equirectangular",

panorama: "https://example.com/path/to/image.jpg",

autoLoad: true,

compass: true,

title: "My Virtual Tour",

author: "Your Name"

});

</script>

</body>

</html>

Tour mode with hotspots:


pannellum.viewer('panorama', {
  default: {
    firstScene: "room1",
    sceneFadeDuration: 1000
  },
  scenes: {
    room1: {
      title: "Living Room",
      hfov: 110,
      pitch: -3,
      yaw: 117,
      type: "equirectangular",
      panorama: "/images/room1.jpg",
      hotSpots: [
        {
          pitch: -2.1,
          yaw: 132.9,
          type: "scene",
          text: "Go to Kitchen",
          sceneId: "kitchen"
        }
      ]
    },
    kitchen: {
      title: "Kitchen",
      hfov: 110,
      pitch: -3,
      yaw: 117,
      type: "equirectangular",
      panorama: "/images/kitchen.jpg",
      hotSpots: [
        {
          pitch: -2.1,
          yaw: 132.9,
          type: "scene",
          text: "Back to Living Room",
          sceneId: "room1"
        }
      ]
    }
  }
});

pannellum.viewer('panorama', {

default: {

firstScene: "room1",

sceneFadeDuration: 1000

scenes: {

room1: {

title: "Living Room",

hfov: 110,

pitch: -3,

yaw: 117,

type: "equirectangular",

panorama: "/images/room1.jpg",

hotSpots: [

{

pitch: -2.1,

yaw: 132.9,

type: "scene",

text: "Go to Kitchen",

sceneId: "kitchen"

}

]

kitchen: {

title: "Kitchen",

hfov: 110,

pitch: -3,

yaw: 117,

type: "equirectangular",

panorama: "/images/kitchen.jpg",

hotSpots: [

{

pitch: -2.1,

yaw: 132.9,

type: "scene",

text: "Back to Living Room",

sceneId: "room1"

}

]

}

});

The catch: Limited plugin ecosystem and no built-in support for 360° videos. For more advanced features, you’ll need to look elsewhere.

2. Photo Sphere Viewer – The Feature Powerhouse

License: MIT
GitHub Stars: 2.2k
Weekly Downloads: 8k+
Maintenance: Very active (TypeScript rewrite in 2025)

Photo Sphere Viewer is what happens when you take a panorama viewer and give it superpowers. Forked from the original Photo Sphere Viewer and completely rewritten in TypeScript, this library is the Swiss Army knife of 360° viewers.

What makes it special:

Plugin architecture – add features without bloat
Built-in Virtual Tour plugin for multi-scene navigation
Markers system – display text, images, videos on top of panoramas
Compass and map plugins for orientation
360° video support (equirectangular and cubemap)
Gyroscope and VR support
Cropped panorama support
Touchscreen friendly

Perfect for:

Complex virtual tours with multiple rooms/scenes
When you need markers and annotations
360° video playback
TypeScript projects

Install it:


npm install @photo-sphere-viewer/core

npm install @photo-sphere-viewer/core

Basic example:


import { Viewer } from '@photo-sphere-viewer/core';
import '@photo-sphere-viewer/core/index.css';

const viewer = new Viewer({
  container: document.querySelector('#viewer'),
  panorama: 'path/to/panorama.jpg',
  caption: 'My awesome panorama',
  loadingImg: 'path/to/loader.gif',
  touchmoveTwoFingers: true,
  mousewheelCtrlKey: true,
});

import { Viewer } from '@photo-sphere-viewer/core';

import '@photo-sphere-viewer/core/index.css';

const viewer = new Viewer({

container: document.querySelector('#viewer'),

panorama: 'path/to/panorama.jpg',

caption: 'My awesome panorama',

loadingImg: 'path/to/loader.gif',

touchmoveTwoFingers: true,

mousewheelCtrlKey: true,

});

With virtual tour plugin:


import { Viewer } from '@photo-sphere-viewer/core';
import { VirtualTourPlugin } from '@photo-sphere-viewer/virtual-tour-plugin';
import { MarkersPlugin } from '@photo-sphere-viewer/markers-plugin';

const viewer = new Viewer({
  container: document.querySelector('#viewer'),
  plugins: [
    MarkersPlugin,
    [VirtualTourPlugin, {
      positionMode: 'manual',
      renderMode: '3d',
    }],
  ],
});

const virtualTour = viewer.getPlugin(VirtualTourPlugin);

virtualTour.setNodes([
  {
    id: '1',
    panorama: 'path/to/room1.jpg',
    name: 'Living Room',
    markers: [
      {
        id: 'kitchen-link',
        image: 'arrow.png',
        position: { yaw: 0, pitch: 0 },
        tooltip: 'Go to Kitchen',
        data: { targetNode: '2' },
      },
    ],
  },
  {
    id: '2',
    panorama: 'path/to/kitchen.jpg',
    name: 'Kitchen',
    markers: [
      {
        id: 'living-link',
        image: 'arrow.png',
        position: { yaw: 180, pitch: 0 },
        tooltip: 'Back to Living Room',
        data: { targetNode: '1' },
      },
    ],
  },
]);

import { Viewer } from '@photo-sphere-viewer/core';

import { VirtualTourPlugin } from '@photo-sphere-viewer/virtual-tour-plugin';

import { MarkersPlugin } from '@photo-sphere-viewer/markers-plugin';

const viewer = new Viewer({

container: document.querySelector('#viewer'),

plugins: [

MarkersPlugin,

[VirtualTourPlugin, {

positionMode: 'manual',

renderMode: '3d',

}],

});

const virtualTour = viewer.getPlugin(VirtualTourPlugin);

virtualTour.setNodes([

{

id: '1',

panorama: 'path/to/room1.jpg',

markers: [

{

id: 'kitchen-link',

image: 'arrow.png',

position: { yaw: 0, pitch: 0 },

tooltip: 'Go to Kitchen',

data: { targetNode: '2' },

{

id: '2',

panorama: 'path/to/kitchen.jpg',

markers: [

{

id: 'living-link',

image: 'arrow.png',

position: { yaw: 180, pitch: 0 },

tooltip: 'Back to Living Room',

data: { targetNode: '1' },

]);

React user? Use the official wrapper:


npm install react-photo-sphere-viewer

npm install react-photo-sphere-viewer

3. Marzipano – Google’s 360° Viewer

License: Apache 2.0
GitHub Stars: 2k
Created by: Google (originally developed by a company Google acquired)

Marzipano is Google’s open-source 360° media viewer. It was originally developed by a company Google acquired, then open-sourced. It’s powerful, flexible, and supports high-resolution panoramas through multi-resolution tiling.

Why it’s powerful:

Multi-resolution support for huge panoramas
Flash fallback for older browsers (though who uses Flash in 2026?)
Powerful JavaScript API
Web-based tool to generate tours
Supports all major desktop and mobile browsers
VR and Google Cardboard support
Cubemap and equirectangular support

Perfect for:

High-resolution panoramas (think gigapixel images)
Google Street View-style tours
Projects needing deep zoom capabilities
When you need Google’s engineering quality

Install:


npm install marzipano

npm install marzipano

The trade-off: Documentation could be more comprehensive, and it requires more coding knowledge compared to Pannellum. But the Marzipano Tool (web-based) helps generate the boilerplate.

4. Panolens.js – Three.js Based

License: MIT
Built on: Three.js
Maintenance: Moderate

Panolens.js is built on top of Three.js, the popular 3D library. This gives it incredible flexibility and performance, though it requires understanding Three.js concepts.

Features:

Equirectangular and cube panoramas
Google Street View panoramas
Infospots (interactive hotspots with tooltips)
360° video support
Virtual tour linking between panoramas
Built-in Tween.js for animations
Event-driven architecture

Perfect for:

Developers already familiar with Three.js
Custom 3D integrations
Advanced interactive experiences

Quick start:


<script src="js/three.min.js"></script>
<script src="js/panolens.min.js"></script>
<script>
  const panorama = new PANOLENS.ImagePanorama('asset/equirectangular.jpg');
  const viewer = new PANOLENS.Viewer();
  viewer.add(panorama);
  
  // Add infospot
  const infospot = new PANOLENS.Infospot(350, PANOLENS.DataImage.Info);
  infospot.position.set(0, 0, -5000);
  infospot.addHoverText('Hello Panolens!');
  panorama.add(infospot);
</script>

const panorama = new PANOLENS.ImagePanorama('asset/equirectangular.jpg');

const viewer = new PANOLENS.Viewer();

viewer.add(panorama);

// Add infospot

const infospot = new PANOLENS.Infospot(350, PANOLENS.DataImage.Info);

infospot.position.set(0, 0, -5000);

infospot.addHoverText('Hello Panolens!');

panorama.add(infospot);

</script>

5. A-Frame – The VR Framework

License: MIT
GitHub Stars: 17.4k
Created by: Mozilla
Weekly Downloads: 29k+

A-Frame is a web framework for building virtual reality experiences. While it’s not specifically a panorama viewer, it’s incredibly powerful for creating immersive 360° tours with VR support.

Why it’s different:

HTML-like markup for 3D scenes
Native VR support (Oculus, Vive, Cardboard)
Entity-Component-System architecture
Declarative syntax – no JavaScript required for basic scenes
Huge ecosystem of components
Works on all VR headsets supported by WebXR

Perfect for:

VR-first experiences
Complex 3D environments beyond simple panoramas
When you want declarative HTML-like syntax
Meta Quest, HTC Vive, Cardboard support

Simple 360° panorama in A-Frame:


<html>
<head>
  <script src="https://aframe.io/releases/1.7.0/aframe.min.js"></script>
</head>
<body>
  <a-scene>
    <a-sky src="path/to/panorama.jpg" rotation="0 -130 0"></a-sky>
    <a-text font="kelsonsans" value="My Virtual Tour" width="6" position="-2.5 0.25 -1.5" rotation="0 15 0"></a-text>
  </a-scene>
</body>
</html>

<html>

<head>

</head>

<body>

<a-scene>

<a-sky src="path/to/panorama.jpg" rotation="0 -130 0"></a-sky>

<a-text font="kelsonsans" value="My Virtual Tour" width="6" position="-2.5 0.25 -1.5" rotation="0 15 0"></a-text>

</a-scene>

</body>

</html>

Virtual tour with navigation:


<a-scene>
  <a-assets>
    <img id="room1" src="room1.jpg">
    <img id="room2" src="room2.jpg">
  </a-assets>
  
  <a-sky id="sky" src="#room1"></a-sky>
  
  <!-- Navigation hotspots -->
  <a-sphere position="5 0 -5" radius="0.5" color="#FF0000"
    onclick="document.querySelector('#sky').setAttribute('src', '#room2')">
  </a-sphere>
</a-scene>

<a-scene>

<a-assets>

</a-assets>

<a-sky id="sky" src="#room1"></a-sky>

<a-sphere position="5 0 -5" radius="0.5" color="#FF0000"

onclick="document.querySelector('#sky').setAttribute('src', '#room2')">

</a-sphere>

</a-scene>

6. Avansel Viewer – The New Contender

License: MIT
Built on: Three.js
Maintenance: Active development

Avansel Viewer is a newer entry focused on being “free, easy to use, and open source.” It’s designed specifically for virtual tours with a clean API.

Features:

Multi-resolution panoramas
Plugins and modules architecture
Hotspots and polygon support
Minimal API – just a few lines of code
Three.js powered

Install:


npm install avansel

npm install avansel

Usage:


import { Avansel } from "avansel";

new Avansel(document.querySelector('#pano'))
  .sphere('/assets/pano.jpg')
  .start();

import { Avansel } from "avansel";

new Avansel(document.querySelector('#pano'))

.sphere('/assets/pano.jpg')

.start();

Ipanorama 360 vs Open Source Alternatives

Ipanorama 360 is a popular commercial WordPress plugin for creating virtual tours. Let’s see how the open-source alternatives stack up:

Feature	Ipanorama 360	Photo Sphere Viewer	Pannellum	Marzipano
Price	$29-59	Free	Free	Free
Hotspots	Yes	Yes (markers)	Yes	Yes
Floor Plans	Yes	Yes (with Map plugin)	No	No
Virtual Tour	Yes	Yes (VirtualTour plugin)	Yes (tour mode)	Yes
Gyroscope	Yes	Yes	Limited	Yes
VR Support	Yes	Yes	No	Yes
Video Support	Yes	Yes	No	Yes
WordPress Plugin	Yes	No (use shortcodes)	Available	Available

The verdict: For simple tours, open-source alternatives match or exceed Ipanorama 360. For complex commercial projects with built-in WordPress integration, Ipanorama might save you development time – but you’ll pay for it.

Complete Comparison Table

Library	Size	License	Best For	Learning Curve
Pannellum	21 KB	MIT	Simple, fast panoramas	Easy
Photo Sphere Viewer	~150 KB	MIT	Feature-rich virtual tours	Medium
Marzipano	~100 KB	Apache 2.0	High-res panoramas	Medium
Panolens.js	~500 KB+	MIT	Three.js integration	Hard
A-Frame	~700 KB	MIT	VR experiences	Medium
Avansel	~500 KB+	MIT	Simple API virtual tours	Easy

Quick Decision Guide

Choose Pannellum if:

You need the smallest footprint possible
You’re building simple 360° image viewers
Performance is critical
You want zero dependencies
You don’t need video support

Choose Photo Sphere Viewer if:

You need a full-featured virtual tour system
You want markers, maps, and navigation
360° video support is required
You’re using TypeScript
You need a plugin ecosystem

Choose Marzipano if:

You’re working with very high-resolution panoramas
You need multi-resolution tiling
You want Google’s engineering quality
Deep zoom capabilities are important

Choose A-Frame if:

VR support is a priority
You want declarative HTML-like syntax
You need complex 3D environments
Oculus/Quest/Vive support matters

Choose Panolens.js if:

You’re already using Three.js
You need advanced 3D customizations
You want event-driven architecture

Complete Virtual Tour Example

Here’s a complete example using Photo Sphere Viewer to create a real estate virtual tour:


<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Real Estate Virtual Tour</title>
  <style>
    body { margin: 0; font-family: Arial, sans-serif; }
    #viewer { width: 100vw; height: 100vh; }
    .tour-info {
      position: absolute;
      top: 20px;
      left: 20px;
      background: rgba(0,0,0,0.7);
      color: white;
      padding: 15px;
      border-radius: 8px;
      z-index: 100;
    }
  </style>
</head>
<body>
  <div class="tour-info">
    <h2>123 Main Street</h2>
    <p>3 Bed • 2 Bath • $450,000</p>
  </div>
  <div id="viewer"></div>

  <script type="module">
    import { Viewer } from '@photo-sphere-viewer/core';
    import { VirtualTourPlugin } from '@photo-sphere-viewer/virtual-tour-plugin';
    import { MarkersPlugin } from '@photo-sphere-viewer/markers-plugin';
    import { GalleryPlugin } from '@photo-sphere-viewer/gallery-plugin';
    import '@photo-sphere-viewer/core/index.css';
    import '@photo-sphere-viewer/virtual-tour-plugin/index.css';
    import '@photo-sphere-viewer/markers-plugin/index.css';
    import '@photo-sphere-viewer/gallery-plugin/index.css';

    const viewer = new Viewer({
      container: document.querySelector('#viewer'),
      plugins: [
        MarkersPlugin,
        [VirtualTourPlugin, {
          positionMode: 'manual',
          renderMode: '3d',
        }],
        [GalleryPlugin, {
          visibleOnLoad: true,
        }],
      ],
    });

    const virtualTour = viewer.getPlugin(VirtualTourPlugin);

    virtualTour.setNodes([
      {
        id: 'living-room',
        panorama: '/tours/house1/living-room.jpg',
        thumbnail: '/tours/house1/thumbs/living-room.jpg',
        name: 'Living Room',
        caption: 'Spacious living room with natural light',
        markers: [
          {
            id: 'to-kitchen',
            image: '/assets/arrow.png',
            position: { yaw: 90, pitch: -10 },
            tooltip: 'Go to Kitchen',
            data: { targetNode: 'kitchen' },
          },
          {
            id: 'info-fireplace',
            position: { yaw: -45, pitch: 0 },
            html: '<div style="background: white; padding: 10px; border-radius: 4px;">Gas fireplace with stone surround</div>',
            anchor: 'bottom center',
          },
        ],
      },
      {
        id: 'kitchen',
        panorama: '/tours/house1/kitchen.jpg',
        thumbnail: '/tours/house1/thumbs/kitchen.jpg',
        name: 'Kitchen',
        caption: 'Modern kitchen with granite countertops',
        markers: [
          {
            id: 'to-living',
            image: '/assets/arrow.png',
            position: { yaw: -90, pitch: -10 },
            tooltip: 'Back to Living Room',
            data: { targetNode: 'living-room' },
          },
          {
            id: 'to-master',
            image: '/assets/arrow.png',
            position: { yaw: 180, pitch: -10 },
            tooltip: 'Go to Master Bedroom',
            data: { targetNode: 'master-bedroom' },
          },
        ],
      },
      {
        id: 'master-bedroom',
        panorama: '/tours/house1/master-bedroom.jpg',
        thumbnail: '/tours/house1/thumbs/master-bedroom.jpg',
        name: 'Master Bedroom',
        caption: 'Master suite with walk-in closet',
        markers: [
          {
            id: 'to-kitchen-2',
            image: '/assets/arrow.png',
            position: { yaw: 0, pitch: -10 },
            tooltip: 'Back to Kitchen',
            data: { targetNode: 'kitchen' },
          },
        ],
      },
    ], 'living-room');

    // Handle marker clicks for navigation
    viewer.addEventListener('select-marker', ({ marker }) => {
      if (marker.data?.targetNode) {
        virtualTour.setCurrentNode(marker.data.targetNode);
      }
    });
  </script>
</body>
</html>

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<!DOCTYPE html>

<head>

<title>Real Estate Virtual Tour</title>

<style>

body { margin: 0; font-family: Arial, sans-serif; }

#viewer { width: 100vw; height: 100vh; }

.tour-info {

position: absolute;

top: 20px;

left: 20px;

background: rgba(0,0,0,0.7);

color: white;

padding: 15px;

border-radius: 8px;

z-index: 100;

}

</style>

</head>

<body>

<h2>123 Main Street</h2>

</div>

import { Viewer } from '@photo-sphere-viewer/core';

import { VirtualTourPlugin } from '@photo-sphere-viewer/virtual-tour-plugin';

import { MarkersPlugin } from '@photo-sphere-viewer/markers-plugin';

import { GalleryPlugin } from '@photo-sphere-viewer/gallery-plugin';

import '@photo-sphere-viewer/core/index.css';

import '@photo-sphere-viewer/virtual-tour-plugin/index.css';

import '@photo-sphere-viewer/markers-plugin/index.css';

import '@photo-sphere-viewer/gallery-plugin/index.css';

const viewer = new Viewer({

container: document.querySelector('#viewer'),

plugins: [

MarkersPlugin,

[VirtualTourPlugin, {

positionMode: 'manual',

renderMode: '3d',

}],

[GalleryPlugin, {

visibleOnLoad: true,

}],

});

const virtualTour = viewer.getPlugin(VirtualTourPlugin);

virtualTour.setNodes([

{

id: 'living-room',

panorama: '/tours/house1/living-room.jpg',

thumbnail: '/tours/house1/thumbs/living-room.jpg',

caption: 'Spacious living room with natural light',

markers: [

{

id: 'to-kitchen',

image: '/assets/arrow.png',

position: { yaw: 90, pitch: -10 },

tooltip: 'Go to Kitchen',

data: { targetNode: 'kitchen' },

{

id: 'info-fireplace',

position: { yaw: -45, pitch: 0 },

html: '<div style="background: white; padding: 10px; border-radius: 4px;">Gas fireplace with stone surround</div>',

anchor: 'bottom center',

{

id: 'kitchen',

panorama: '/tours/house1/kitchen.jpg',

thumbnail: '/tours/house1/thumbs/kitchen.jpg',

caption: 'Modern kitchen with granite countertops',

markers: [

{

id: 'to-living',

image: '/assets/arrow.png',

position: { yaw: -90, pitch: -10 },

tooltip: 'Back to Living Room',

data: { targetNode: 'living-room' },

{

id: 'to-master',

image: '/assets/arrow.png',

position: { yaw: 180, pitch: -10 },

tooltip: 'Go to Master Bedroom',

data: { targetNode: 'master-bedroom' },

{

id: 'master-bedroom',

panorama: '/tours/house1/master-bedroom.jpg',

thumbnail: '/tours/house1/thumbs/master-bedroom.jpg',

caption: 'Master suite with walk-in closet',

markers: [

{

id: 'to-kitchen-2',

image: '/assets/arrow.png',

position: { yaw: 0, pitch: -10 },

tooltip: 'Back to Kitchen',

data: { targetNode: 'kitchen' },

], 'living-room');

// Handle marker clicks for navigation

viewer.addEventListener('select-marker', ({ marker }) => {

if (marker.data?.targetNode) {

virtualTour.setCurrentNode(marker.data.targetNode);

}

});

</script>

</body>

</html>

The Bottom Line

The open-source JavaScript ecosystem for 360° virtual tours has never been better. You don’t need to pay for commercial solutions like Ipanorama 360 to create professional virtual tours.

Here’s the TL;DR:

Pannellum for simple, lightning-fast panoramas (21KB!)
Photo Sphere Viewer for full-featured virtual tours with all the bells and whistles
Marzipano when working with ultra-high-resolution images
A-Frame for VR-first experiences and complex 3D environments
Panolens.js if you’re already in the Three.js ecosystem

Quick decision guide:

Simple 360° images → Pannellum
Full virtual tours with navigation → Photo Sphere Viewer
VR headset support → A-Frame
High-res gigapixel images → Marzipano
Already using Three.js → Panolens.js

Pick the right tool for your project and you’ll have a stunning virtual tour up and running in no time – and your wallet will thank you!

FAQ

What’s the best free alternative to Ipanorama 360?

Photo Sphere Viewer is the best free alternative to Ipanorama 360. It offers virtual tours, hotspots, markers, 360° video support, and a plugin ecosystem – all for free under MIT license. Pannellum is a simpler alternative if you just need basic panorama viewing with tour capabilities.

Can I create virtual tours with hotspots using open-source JavaScript?

Absolutely! Photo Sphere Viewer, Pannellum, and Marzipano all support hotspots. Photo Sphere Viewer has the most advanced marker system with HTML content support. Pannellum offers simple but effective hotspot navigation. All three can link multiple panoramas into complete virtual tours.

What’s the smallest 360° panorama viewer library?

Pannellum is the smallest at just 21KB gzipped. It’s pure HTML5/CSS3/JavaScript with zero dependencies. For comparison, Three.js-based viewers like Photo Sphere Viewer or Panolens.js are 500KB+ because they include the Three.js library.

Do these libraries work on mobile devices?

Yes! All major libraries (Pannellum, Photo Sphere Viewer, Marzipano, A-Frame) work on mobile browsers. Photo Sphere Viewer and A-Frame have the best mobile support with touch gestures and gyroscope integration. Pannellum works on mobile but with more limited gesture support.

Can I use these libraries with React, Vue, or Angular?

Yes! Photo Sphere Viewer has an official React wrapper (react-photo-sphere-viewer). Pannellum works with any framework and has community React wrappers (pannellum-react). A-Frame works with any framework. Marzipano and Panolens.js can be integrated into any framework with standard JavaScript.

Do these viewers support VR headsets?

A-Frame has the best VR support, working with Oculus Quest, HTC Vive, Valve Index, and Google Cardboard. Photo Sphere Viewer supports VR mode. Marzipano also supports VR. Pannellum does not support VR headsets.

Can I display 360° videos with these libraries?

Photo Sphere Viewer supports 360° videos in both equirectangular and cubemap formats. Panolens.js and Marzipano also support 360° videos. Pannellum does not support video – it’s image-only.

Are these libraries free for commercial use?

Yes! Pannellum (MIT), Photo Sphere Viewer (MIT), Marzipano (Apache 2.0), Panolens.js (MIT), and A-Frame (MIT) are all open source with permissive licenses. You can use them in commercial projects without paying licensing fees.

What’s the difference between equirectangular and cubemap panoramas?

Equirectangular is a single 2:1 aspect ratio image that wraps around a sphere. It’s the most common format (used by Google Street View). Cubemap uses 6 separate images (top, bottom, left, right, front, back) arranged in a cube. Cubemaps offer better performance and no distortion at the poles, but require more file management.

How do I handle very high-resolution panoramas?

Use Marzipano or Pannellum with multi-resolution support. These libraries tile large images and only load what’s needed based on zoom level. This prevents browser crashes from loading massive single images. Photo Sphere Viewer can handle large images but doesn’t have native multi-resolution tiling.

Can I create floor plans or maps showing my position in the tour?

Photo Sphere Viewer has a Map plugin that displays floor plans with your current position. It can also show markers on the map. Marzipano can be customized to include floor plans with some coding. Pannellum doesn’t have built-in map support.

Which library has the best documentation?

Photo Sphere Viewer has the most comprehensive documentation with live examples, API reference, and plugin guides. Pannellum has good documentation for its core features. A-Frame has excellent documentation due to Mozilla backing and large community. Marzipano’s documentation could be more detailed.

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Open Source Virtual Tour & 360° Panorama Libraries in JavaScript 2026

Table of Contents

What Makes a Great 360°/Virtual Tour Library?

Best Open Source 360° Panorama Viewers

1. Pannellum – The Lightweight Champion

2. Photo Sphere Viewer – The Feature Powerhouse

3. Marzipano – Google’s 360° Viewer

4. Panolens.js – Three.js Based

5. A-Frame – The VR Framework

6. Avansel Viewer – The New Contender

Ipanorama 360 vs Open Source Alternatives

Complete Comparison Table

Quick Decision Guide

Choose Pannellum if:

Choose Photo Sphere Viewer if:

Choose Marzipano if:

Choose A-Frame if:

Choose Panolens.js if:

Complete Virtual Tour Example

The Bottom Line

FAQ

What’s the best free alternative to Ipanorama 360?

Can I create virtual tours with hotspots using open-source JavaScript?

What’s the smallest 360° panorama viewer library?

Do these libraries work on mobile devices?

Can I use these libraries with React, Vue, or Angular?

Do these viewers support VR headsets?

Can I display 360° videos with these libraries?

Are these libraries free for commercial use?

What’s the difference between equirectangular and cubemap panoramas?

How do I handle very high-resolution panoramas?

Can I create floor plans or maps showing my position in the tour?

Which library has the best documentation?

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