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Flax Engine vs Photon Engine

Flax Engine logo

Flax Engine

Game Development

Modern 3D game engine with visual editor

From
Free
Rated
-
Full reviewWebsite
Photon Engine logo

Photon Engine

Game Development

Hosted multiplayer networking billed by concurrent users, not by seat or by player

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; Photon Engine billing follows peak concurrent users, so a single stream or a launch weekend raises the bill immediately, and studios that cannot forecast concurrency cannot forecast the cost of their own launch.
  • They diverge on capability: Flax Engine covers 3D graphics rendering, Photon Engine covers Concurrent user billing.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

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

Attributes where Flax Engine and Photon Engine differ
AttributeFlax EnginePhoton Engine
Pricing modelfreePer month by peak concurrent users
PlatformsWindows, Linux, Playstation, XboxWindows, macOS, Linux, iOS, Android, Web, Console
Founded2017Unknown

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 Photon Engine

  • Concurrent user billing
  • Photon Fusion
  • Photon Quantum
  • Photon Voice and Chat
  • Global relay
  • Matchmaking and rooms

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 Photon Engine
  • Multi-platform deployment from one editornot Photon Engine
  • Prototyping with the bundled Flax Samples projectsnot Photon Engine

Photon Engine

  • Adding multiplayer to a Unity game without hiring a network engineernot Flax Engine
  • Competitive titles needing deterministic rollback rather than state synchronisationnot Flax Engine
  • Games with a large but thinly spread player base, where concurrency stays low and per player pricing would cost morenot Flax Engine
  • Training and simulation projects that need shared real-time state outside gamesnot 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

Photon Engine

  • Billing follows peak concurrent users, so a single stream or a launch weekend raises the bill immediately, and studios that cannot forecast concurrency cannot forecast the cost of their own launch.
  • Exceeding the band does not degrade gracefully; additional players are refused connections until concurrency falls or the plan is upgraded, which is a visible outage to your players at the worst possible moment.
  • PUN, the product most tutorials and courses still teach, is legacy, so a large share of the learning material available online points new projects at the wrong SDK.
  • Self-hosting is an enterprise arrangement rather than a purchasable licence, so a studio that wants its servers on its own infrastructure for cost or compliance reasons cannot simply buy that.
  • It is a networking layer only; accounts, persistence, leaderboards, inventories and anti-cheat all come from other services, so the multiplayer stack ends up as several vendors rather than one.

Pricing, plan by plan

Flax Engine

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

Photon Engine

Free
  • FreeFree
    • A small concurrent user allowance for development and early testing
    • All regions available
    • No time limit on the free tier
  • Entry band$9/month
    • Around one hundred concurrent users
    • Full SDK access
    • Regional server selection
  • Higher bands$undefined/month
    • Sold in steps up to tens of thousands of concurrent users
    • Price rises with each band rather than with total players
    • Enterprise and self-hosted arrangements handled directly by Exit Games

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 Photon Engine if

  • You need concurrent user billing.
  • You want to start without paying.
  • You work on Windows, macOS, Linux, iOS, Android, Web, Console.
  • You also want photon fusion.
Photon Engine review

Questions people ask

Is Flax Engine or Photon Engine better?
Neither clearly leads. Flax Engine starts at Free and Photon Engine at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Flax Engine or Photon Engine?
Flax Engine starts at Free and Photon Engine at Free.
Does Flax Engine or Photon Engine run on more platforms?
Flax Engine runs on Windows, Linux, Playstation, Xbox. Photon Engine runs on Windows, macOS, Linux, iOS, Android, Web, Console.
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 Photon Engine is typically brought in for.
What can Flax Engine do that Photon Engine cannot?
Flax Engine covers 3D graphics rendering, Visual editor, C# scripting, Physics engine. Photon Engine covers Concurrent user billing, Photon Fusion, Photon Quantum, Photon Voice and Chat.

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
Photon Engine: What exactly is a concurrent user?

A player connected to Photon at that moment. Your plan is sized by the peak of that number, not by downloads, registered accounts or monthly actives.

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
Photon Engine: Which product should a new project use?

Fusion for most real-time games, Quantum where determinism matters such as fighting and competitive titles. PUN is legacy and should not start a new project despite the volume of tutorials.

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
Photon Engine: Does it work outside Unity?

Unity is the first-class target. Unreal and other engines are supported through Realtime SDKs with less coverage and slower feature parity.

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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