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Flax Engine vs LDtk

Flax Engine logo

Flax Engine

Game Development

Modern 3D game engine with visual editor

From
Free
Rated
-
Full reviewWebsite
LDtk logo

LDtk

Game Development

Modern 2D level editor from the creator of Dead Cells

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; LDtk no web, iOS, or Android build; it is an Electron desktop app for Windows/macOS/Linux only
  • They diverge on capability: Flax Engine covers 3D graphics rendering, LDtk covers Auto-layers.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

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

Attributes where Flax Engine and LDtk differ
AttributeFlax EngineLDtk
Pricing modelfreeopen-source
PlatformsWindows, Linux, Playstation, XboxWindows, macOS, Linux
Founded20172020

Identical on both: starting price (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 LDtk

  • Auto-layers
  • IntGrid layers
  • Entity system
  • Enums
  • World map
  • Rule-based tiling
  • JSON export
  • Hot reloading

Both cover

  • Local deployment
  • Windows support
  • Linux 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 LDtk
  • Multi-platform deployment from one editornot LDtk
  • Prototyping with the bundled Flax Samples projectsnot LDtk

LDtk

  • 2D platformer and top-down level buildingnot Flax Engine
  • Placing customizable entities such as spawns, enemies, items, and triggersnot Flax Engine
  • Auto-tiling and auto-rendering via a visual rule systemnot Flax Engine
  • Multi-level 'worlds' with seamless level transitionsnot Flax Engine
  • Native Aseprite (.aseprite) import with live reloadingnot 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

LDtk

  • No web, iOS, or Android build; it is an Electron desktop app for Windows/macOS/Linux only
  • Native format is JSON; use with other formats such as Tiled TMX requires a separate importer or custom parsing
  • Engine integration depends on separate official importers/libraries per engine (Unity, Godot, MonoGame, Bevy, GameMaker, Haxe, Playdate)
  • dev-x.y.z branches on GitHub are explicitly flagged as potentially unstable and not for production

Pricing, plan by plan

Flax Engine

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

LDtk

Free

No published plan breakdown. See the LDtk review.

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 LDtk if

  • You need auto-layers.
  • You want to start without paying.
  • You work on Windows, macOS, Linux.
  • You also want intgrid layers.
LDtk review

Questions people ask

Is Flax Engine or LDtk better?
Neither clearly leads. Flax Engine starts at Free and LDtk at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Flax Engine or LDtk?
Flax Engine starts at Free and LDtk at Free.
Does Flax Engine or LDtk run on more platforms?
Flax Engine runs on Windows, Linux, Playstation, Xbox. LDtk runs on Windows, macOS, Linux.
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 LDtk is typically brought in for.
What can Flax Engine do that LDtk cannot?
Flax Engine covers 3D graphics rendering, Visual editor, C# scripting, Physics engine. LDtk covers Auto-layers, IntGrid layers, Entity system, Enums. Both handle Local deployment, Windows support, Linux support.

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
LDtk: Does LDtk cost anything to use?

LDtk is completely free to use without any limitations. The license is Apache 2.0 open source.

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
LDtk: Can I support LDtk development?

LDtk operates on a pay-what-you-want basis. Users can optionally purchase or become a direct sponsor to support the developer's work, but payment is not required.

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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