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Game Development · head to head

Flax Engine vs MonoGame

Flax Engine logo

Flax Engine

Game Development

Modern 3D game engine with visual editor

From
Free
Rated
-
Full reviewWebsite
MonoGame logo

MonoGame

Game Development

Create games using C# and MonoGame

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Flax Engine flax charges a 4% royalty on game earnings above $250,000, assessed per calendar quarter; MonoGame console targets for PlayStation 4 and 5, Xbox One and Nintendo Switch require platform authorisation rather than being openly available
  • They diverge on capability: Flax Engine covers 3D graphics rendering, MonoGame covers Graphics rendering.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Flax Engine and MonoGame actually diverge.

Attributes where Flax Engine and MonoGame differ
AttributeFlax EngineMonoGame
PlatformsWindows, Linux, Playstation, XboxWindows, Macos, Linux, Ios, Android, Playstation, Xbox
Founded20172009

Identical on both: starting price (Free), pricing model (free), free tier (Yes), user rating (Not yet rated), category (Game Development).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Flax Engine

  • 3D graphics rendering
  • Visual editor
  • C# scripting
  • Physics engine
  • Audio system
  • Particle effects
  • Skeletal animation
  • Material system

Only in MonoGame

  • Graphics rendering
  • Audio engine
  • Physics integration
  • Content pipeline
  • Input handling
  • Sprite system
  • 2D and 3D support
  • Mobile deployment

Both cover

  • C#
  • .NET
  • Visual Studio
  • Open-source
  • Local deployment
  • Console deployment
  • Windows support
  • Linux support
  • C# language support

What people use each for

The jobs each tool is most often brought in to do.

Flax Engine

  • Building 3D games in C# and C++ with full engine source accessnot MonoGame
  • Multi-platform deployment from one editornot MonoGame
  • Prototyping with the bundled Flax Samples projectsnot MonoGame

MonoGame

  • Cross-platform game development in C# and .NETnot Flax Engine
  • Shipping to Windows, macOS and Linux from one codebasenot Flax Engine
  • Mobile releases on Android, iOS and iPadOSnot Flax Engine
  • Commercial indie titles with no royalty or runtime feenot Flax Engine

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Flax Engine

  • Flax charges a 4% royalty on game earnings above $250,000, assessed per calendar quarter
  • Free use is granted for non-commercial or educational usage; commercial releases fall under the royalty
  • Users must accept the Flax Engine End-User License Agreement before using the engine or its tools, so it is not an OSI open source licence despite the source being on GitHub
  • Non-game uses such as in-house tools or SaaS products need a custom licence negotiated with the vendor, and no rate card is published for per-seat or flat-fee options

MonoGame

  • Console targets for PlayStation 4 and 5, Xbox One and Nintendo Switch require platform authorisation rather than being openly available
  • A code-first framework in C# with no bundled editor or visual scene tooling

Pricing, plan by plan

Flax Engine

Free
  • FreeFree
    • Full engine
    • Visual editor
    • C# scripting

MonoGame

Free
  • FreeFree
    • Full framework
    • C# support
    • Cross-platform

Which should you pick?

Choose Flax Engine if

  • You need 3d graphics rendering.
  • You want to start without paying.
  • You work on Windows, Linux, Playstation, Xbox.
  • You also want visual editor.
Flax Engine review

Choose MonoGame if

  • You need graphics rendering.
  • You want to start without paying.
  • You work on Windows, Macos, Linux, Ios, Android, Playstation, Xbox.
  • You also want audio engine.
MonoGame review

Questions people ask

Is Flax Engine or MonoGame better?
Neither clearly leads. Flax Engine starts at Free and MonoGame at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Flax Engine or MonoGame?
Flax Engine starts at Free and MonoGame at Free.
Does Flax Engine or MonoGame run on more platforms?
Flax Engine runs on Windows, Linux, Playstation, Xbox. MonoGame runs on Windows, Macos, Linux, Ios, Android, Playstation, Xbox.
Can I use Flax Engine for free?
Both have a free tier, so you can try either at no cost before committing.
What is Flax Engine best used for?
Flax Engine is most often used for building 3d games in c# and c++ with full engine source access, multi-platform deployment from one editor, prototyping with the bundled flax samples projects. Of those, building 3d games in c# and c++ with full engine source access and multi-platform deployment from one editor are not what MonoGame is typically brought in for.
What can Flax Engine do that MonoGame cannot?
Flax Engine covers 3D graphics rendering, Visual editor, C# scripting, Physics engine. MonoGame covers Graphics rendering, Audio engine, Physics integration, Content pipeline. Both handle C#, .NET, Visual Studio, Open-source.

Answered from the vendors’ own pages

Flax Engine: How much does Flax Engine cost?

Flax Engine is free during development. Once you ship a game commercially, you pay a 4% royalty on earnings only if your quarterly revenue exceeds $250,000 in a calendar quarter. Below that threshold, there is no royalty charge.

Source
MonoGame: How much does MonoGame cost?

MonoGame is completely free with no subscription model, royalty payments, licensing costs, or runtime fees.

Source
Flax Engine: Is Flax Engine free for educational and uncommercial projects?

Yes. Flax Engine is free for uncommercial or educational usage. You only pay royalties when you release a commercial product that exceeds the $250,000 quarterly earnings threshold.

Source
MonoGame: What funding model does MonoGame use?

MonoGame Foundation is a non-profit 501(c)(3) organization supported by voluntary community donations rather than user fees.

Source
Flax Engine: Do all Flax Engine users get access to the same features?

Yes. There is one version of Flax Engine. All users get full engine access with all features, supported platforms, complete editor source code on GitHub, sample projects, and free deployment to all supported platforms.

Source
Flax Engine: Does Flax Engine offer custom licensing options?

Yes. For non-game industries or specific needs, Flax Engine offers custom licensing including per-seat licensing (monthly or yearly) or flat fees per project, with pricing based on team size and product use case.

Source
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