EnTT vs Jolt Physics
Which should you use? A side-by-side look at what each one does, who it suits, what it costs, how hard it is to set up, and where each falls short.
Open source · MIT
A header-only C++ library for entity-component systems and other game-programming tools.
Open source · MIT
A C++ library for simulating solid objects, collisions, and physical constraints in games and VR.
The short answer
Choose EnTT if you need…
- C++ game developers who want an ECS
- Developers building simulations or engines who need a data-oriented entity store
- C++ programmers who want reusable utilities like signals, hash maps or resource handles
- Projects that already use CMake or a C++ package manager such as vcpkg or Conan
Choose Jolt Physics if you need…
- C++ game developers who need a physics engine for rigid bodies and collisions
- VR application developers building interactive objects
- Teams that want multithreaded physics updates and background collision queries
- Developers who need deterministic simulation for replicating state across clients by sending inputs
Side-by-side
| EnTT | Jolt Physics | |
|---|---|---|
| Type | Library | Library |
| Price | Free and open source | Free and open source |
| Licence | MIT | MIT |
| GitHub stars | 13.2k | 12.1k |
| Setup difficulty | Advanced | Advanced |
| How you get it | Clone and build from source | Clone and build from source |
| Main language | C++ | C++ |
| Last code update | 4 days ago | 4 days ago |
What each one is
EnTT
EnTT is a C++ library, written in modern C++, that provides an entity-component system (ECS), a pattern where game objects are plain IDs with attached data components, used mostly in game development. The README also lists other pieces such as a reflection system, signal handlers, resource management and an execution graph builder. It is header-only, so you include it in your project rather than linking a separate binary.
Jolt Physics
Jolt Physics is a C++ library that calculates how rigid objects move, bump into each other, and connect through joints. Game and VR developers add it to their projects so their worlds behave physically without writing that math themselves. The README says it is designed to spread work across multiple CPU cores and to be used mainly for games or VR simulations rather than exact real-world engineering.
Best for
EnTT
- C++ game developers who want an ECS
- Developers building simulations or engines who need a data-oriented entity store
- C++ programmers who want reusable utilities like signals, hash maps or resource handles
- Projects that already use CMake or a C++ package manager such as vcpkg or Conan
Jolt Physics
- C++ game developers who need a physics engine for rigid bodies and collisions
- VR application developers building interactive objects
- Teams that want multithreaded physics updates and background collision queries
- Developers who need deterministic simulation for replicating state across clients by sending inputs
Strengths
EnTT
- Header-only, so integration is mostly adding the include path
- Documented API and a wiki with FAQs
- Used by projects the README names, including Minecraft and ArcGIS Runtime SDKs
Jolt Physics
- The README describes multi-core friendly design, including background loading and parallel collision queries
- Broad feature set listed in the README, covering shapes, constraints, vehicles, character controllers, and soft bodies
- Released under the MIT license, which the metadata lists
Not ideal for
EnTT
- Developers who want a full game engine with editor and rendering out of the box, since EnTT is a library of building blocks
- Developers not working in C++, because the library is written in C++
- Teams needing a ready-made binary release, since the latest release has no binaries
Jolt Physics
- Developers who need a ready-made editor or game engine, since the README describes only a library
- Projects that must use a language other than C++ without a binding, since the README points to a separate WebAssembly project only
- Engineering or scientific work needing exact real-world accuracy, because the README says it makes approximations for games and VR
Trade-offs
EnTT
- Large feature surface described only briefly in the README, so learning the whole library takes time
- Requires familiarity with C++ and ECS concepts to use effectively
- Latest release has no prebuilt binaries
Jolt Physics
- The README is long and assumes C++ knowledge; the samples and API docs are needed to learn it
- Some features have stated limits, such as hair collision supporting only convex hulls and compound shapes
- Latest release is listed without binaries, so integration means building from source
Getting started
EnTT
Clone the repository
git clone https://github.com/skypjack/entt.gitJolt Physics
Clone the repository
git clone https://github.com/jrouwe/JoltPhysics.gitFrequently asked questions
What is the difference between EnTT and Jolt Physics?
EnTT: A header-only C++ library for entity-component systems and other game-programming tools. Jolt Physics: A C++ library for simulating solid objects, collisions, and physical constraints in games and VR. EnTT suits c++ game developers who want an ecs, while Jolt Physics suits c++ game developers who need a physics engine for rigid bodies and collisions.
Are EnTT and Jolt Physics free?
EnTT: Free and open source. Jolt Physics: Free and open source.
Is EnTT or Jolt Physics more popular?
EnTT has more GitHub stars (13.2k) than Jolt Physics (12.1k). Popularity isn't the same as fit — check which one matches your use case above.
What are other alternatives to EnTT and Jolt Physics?
Other options people compare them with include Flame, PlayCanvas, Dear ImGui, Phaser, JSON for Modern C++.
Keep comparing
Built from our catalogue entries for both products: open-source details come from each project's README (AI-assisted, refreshed weekly) and GitHub data; AI-tool details are editorial. Spotted something wrong? Let us know from either product's page.