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Comparison

Defold vs Summer Engine

	Defold	Summer Engine
What it says it does	DefoldDefold is a free, cross-platform game engine for building 2D and 3D games on desktop, web, mobile, and consoles with one streamlined workflow.	Summer EngineThe AI game engine for people and agents. Build real 2D and 3D games with Claude Code, Codex, Cursor or Summer Agent, publish on Summer Games or Steam, and earn.
Pricing	DefoldFree: no fees or royalties; source code available under the Defold license (official)	Summer EngineDesktop app free; Free plan with limited hosted AI; Pro $20/mo; Pro+ $60/mo; Ultra $200/mo (yearly saves 20% on Pro and above). Local MCP stays free (official)
Website	Defoldhttps://defold.com/	Summer Enginehttps://www.summerengine.com/

Which tool for which job

Defold wins when you want tiny, fast builds and a free engine without royalties.

Summer Engine wins when you want to build and ship a real 2D/3D game with an AI-first engine rather than only generate assets for Unity or Unreal.

Descriptions in the table come from each vendor's own site. This verdict is a fit call from those official pages as of 5 November 2026, not a shared benchmark or a hands-on score. Prices change, so confirm the pricing row on each tool page. How we review tools.

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