Unity is not available as a web app but there are plenty of alternatives that runs in the browser with similar functionality. The best Online alternative is Godot Engine, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 100 alternatives to Unity and many of them are available as a web app so hopefully you can find a suitable replacement. Other interesting Online alternatives to Unity are GDevelop, Candlestick, microStudio and PlayCanvas.
Godot Engine is a feature-packed, cross-platform game engine to create 2D and 3D games from a unified interface. It provides a comprehensive set of common tools, so that users can focus on making games without having to reinvent the wheel.
GDevelop is an open-source game making software designed to be used by everyone. Any kind of 2D games can be created with it and no programming skills are required to get started. Logic of games are made using visual events.
Open-source editor runs in browser for making games, animations, and interactive content, offering vector drawing, timeline tools, asset import/export, JavaScript scripting, onion-skinning, plug-ins, and no installation or feature restrictions required.
microStudio is a free game engine online. Create games, learn programming, play, share, prototype and jam!.
PlayCanvas is the world’s easiest to use WebGL Game Engine. It’s free, it’s open source and it’s backed by amazing developer tools.
Browser-based 2D game creation engine using a visual event-driven system, integrates JavaScript for advanced development, requires no installation or prior programming, supports exporting to HTML5, mobile platforms, Xbox One, and enables real-time editing on any device.
One framework for creating powerful cross-platform games. The spiritual successor to XNA with 1000's of titles shipped across desktop, mobile, and console platforms. MonoGame is a fully managed .NET open source game framework without any black boxes.
HARFANG®3D is a cross-platform & multi-language solution to integrate with embedded systems, existing environments & combining features to meet the industrial standards of 3D imaging.
Blend4Web is an Open Source tool for interactive 3D visualization on the Internet. It provides Free and Commercial licenses.
Banquise is a global community of players and creators. Create any games or other interactive content in no-code and share it with the whole community.
Multimedia JavaScript framework to create real cross-platform and hybrid game engines, games, emulators, multimedia libraries and apps.
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Its sopen source with no fees