Developer-first terms: create, ship and sell your 2D games with no hidden royalties and no runtime penalties.
Version 1.1, last updated October 22, 2026.
In plain words: Using the engine means you agree to these terms. If you use it for a company, you confirm you can sign for it.
By downloading, installing, or using Krotox Engine (including the Krotox Engine Editor, Standalone Runtime, C# ScriptCore API, and associated tools), you enter into a legally binding agreement to be governed by these Terms and Conditions.
If you are using the engine on behalf of an organization, studio, or enterprise, you represent and warrant that you possess the full legal authority to bind that entity to these Terms.
In plain words: You never pay us a share of your income or a fee per install.
We stand firmly against anti-developer monetization practices. Krotox Engine is distributed under a perpetual Zero-Fee Commercial Model:
Interactive illustration: at any revenue level you keep 100%. The revenue share is 0% and there are no runtime fees.
In plain words: Sell your game on any store, and ship Krotox's runtime inside it for free.
Krotox Engine grants you a perpetual, worldwide, non-exclusive, royalty-free license to:
KrotoxEngine-Runtime) and Mono ScriptCore binaries within your standalone game distributions without paying licensing fees.In plain words: Your game is yours. We take no ownership of what you make.
You retain complete and unencumbered ownership of your game:
Krotox Engine claims zero intellectual property rights or ownership interest in any assets or code that you import, create, or export using the engine.
In plain words: Krotox itself stays ours. The open-source libraries inside it keep their own licences.
The Krotox Engine core, dockable editor, documentation, and brand assets (including the Krotox mascot art) are protected by copyright and intellectual property laws. These Terms do not transfer any of that ownership to you.
Krotox Engine integrates third-party libraries under permissive licenses (MIT, Apache 2.0, zlib, and public-domain terms). Those components stay under their own licenses:
In plain words: Google Play, signing keys and policy compliance are your job.
When exporting and distributing applications to Android devices:
In plain words: No malware or attacks, no infringing other people's work, and do not pass the engine off as yours.
You agree not to use Krotox Engine, its compilers, or its community services to:
In plain words: No account needed. The site's content can change as the engine does.
Browsing krotox.com needs no account. How the site and the engine handle data is described in the Privacy Policy. Documentation and marketing content can change without notice as the engine develops.
In plain words: Common situations, and what the terms say about each.
| If... | Then... |
|---|---|
| Your game earns millions | You still pay 0% revenue share and no runtime fees. Your rights do not expire at any revenue level. |
| You ship on Steam, itch.io or the Mac App Store | Allowed. Bundle the runtime in your build at no cost. |
| You publish on Google Play | The Google Play account, signing keys and policy compliance are yours to manage. |
| You use Krotox in a company | Allowed, as long as you have the authority to accept these terms for the company. The terms set no per-seat fee. |
| You want to use the mascot art in your marketing | Brand assets, including the mascot art, stay Krotox's. These terms do not grant that right, so ask first at the legal address. |
| You want to redistribute the editor itself | The license in these terms is for developing and distributing your games. Ask first at the legal address. |
In plain words: Short answers to the questions people ask most.
No. There is no revenue share, no per-install fee, and no revenue threshold.
Yes. Commercial, proprietary, freemium and ad-supported games are all covered.
No. There is no forced splash screen and no "Made with Krotox" requirement.
You do: your art, scripts, audio, levels, story and trademarks. Krotox claims no ownership.
Yes. Proprietary games are explicitly covered.
No. See the Privacy Policy: the standalone runtime contains no analytics or licence checks.
In plain words: The engine is provided as it is, without guarantees.
KROTOX ENGINE, ITS RUNTIME, PACKAGING TOOLCHAINS, AND DOCUMENTATION ARE PROVIDED ON AN "AS IS" AND "AS AVAILABLE" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
In plain words: We are not liable for indirect losses such as lost profit or lost data.
TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, IN NO EVENT SHALL THE KROTOX ENGINE CREATORS, MAINTAINERS, OR CONTRIBUTORS BE LIABLE FOR ANY INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL, OR PUNITIVE DAMAGES (INCLUDING LOSS OF PROFITS, DATA CORRUPTION, DEVICE FAILURE, OR BUSINESS INTERRUPTION) ARISING OUT OF OR RELATED TO YOUR USE OR INABILITY TO USE THE ENGINE.
In plain words: Every change is dated and listed below.
We record every change to these Terms in the revision history below and update the version and "Last updated" date at the top of this page.
In plain words: Questions about licensing? Email us.
If you have questions regarding commercial licensing, enterprise custom integrations, or legal inquiries:
Krotox Engine Legal & Licensing
[email protected]
Direct inquiries will be reviewed by the core maintainers.