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 GDevelop, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 100 alternatives to Unity and 14 are available as a web app so hopefully you can find a suitable replacement. Other interesting Online alternatives to Unity are PlayCanvas (Freemium), MonoGame (Free, Open Source), Babylon.js (Free, Open Source) and microStudio (Free, Open Source).
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.
GDevelop vs Unity opinions
Some users think GDevelop is a great alternative to Unity, some don't.
GDevelop is a 2D game engine based in visual programming and very limited in that aspect.
Negative comment • about 4 years ago
DeeJayLSP GDevelop is more like a Construct alternative than an Unity one.
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.
CopperCube is a 3D editor for creating interactive 3D applications or simple games for Flash / Stage 3D, WebGL or as application. No programming is necessary for this. Simply import your 3D models, specify camera controllers and behaviors, and hit 'publish'.
Your project’s smart 3D digital twin as a Service. SmartShape (formerly Minko) is a technology to develop and design rich, interactive and universal 3D applications targeting computers, web browsers and mobile platforms.