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1. [Software Factory Directory](/software-factories.md)
2. [App builders](/software-factories/category/app-builders.md)
3. Summer Engine

# Summer Engine

[App builders](/software-factories/category/app-builders.md)

[Visit website](https://www.summerengine.com/)

Free desktop game engine with built-in AI that drafts 2D and 3D game scenes and GDScript from plain English.

## Overview

Summer Engine is a free desktop game engine for macOS and Windows with AI built in. You describe a 2D or 3D game in plain English, and it drafts scenes and GDScript, Godot’s scripting language, for you to review and edit. The site says it is compatible with Godot 4.

You own your games, with no royalties. Hosted Summer AI has a free tier and a $20 a month Pro plan.

Its AI connection tools (an MCP server, CLI and skills) are open source and let agents such as Claude Code, Cursor and Codex operate the engine.

## Features

* Drafts 2D and 3D scenes and GDScript from plain-English descriptions.
* Runs on macOS and Windows.
* Compatible with Godot 4, according to its site.
* Lets you own your games, with no royalties.
* Open-source MCP server, CLI and skills let outside agents operate the engine.

## Details

* Website

  [summerengine.com](https://www.summerengine.com/)

* Company

  Summer Engine

* Headquarters

  Copenhagen, Denmark

* Category

  [App builders](/software-factories/category/app-builders.md)

* Source

  Proprietary

* Topics

  * [Desktop app](/software-factories/?tag=desktop-app)
  * [MCP](/software-factories/?tag=mcp)
  * [Prompt to app](/software-factories/?tag=prompt-to-app)

* Listed

  September 2026

* Last verified

  October 2026

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