# Jolt Physics 9 Hacker News commenters recommended Jolt Physics and 2 criticized it, November 2025 to November 2026. It was recommended in 5 of 13 months. **Verdict:** Free physics engine praised for cross-platform determinism, rollback networking and a WASM build. Critics find TypeScript use finicky and some gave up on its Godot integration. ## Why people recommend it - Deterministic cross-platform networking (2 comments): "You use jolt for cross-platform determinism with rollback, replicating only inputs." ([source](https://news.ycombinator.com/item?id=48739932)) "Deterministic cross-platform networking with jolt is fine and good" ([source](https://news.ycombinator.com/item?id=48740108)) - Works well, high quality (2 comments): "So far Jolt is working pretty well" ([source](https://news.ycombinator.com/item?id=48749383)) "can be extremely high quality" ([source](https://news.ycombinator.com/item?id=47506962)) - Preferred over Bullet (2 comments): "i love that we went from bullet being the only real option" ([source](https://news.ycombinator.com/item?id=48748243)) "Jolt or Bullet for physics." ([source](https://news.ycombinator.com/item?id=47821647)) ## What people warn about - Had problems and gave up (3 comments): "I even had to give up on Godot's Jolt physics." ([source](https://news.ycombinator.com/item?id=49101634)) "I even had to give up on Godot's Jolt physics" ([source](https://news.ycombinator.com/item?id=49101451)) "I don't know why I had such problems with it." ([source](https://news.ycombinator.com/item?id=49107415)) ## Alternatives hackers recommend - [Box3D](https://hackerapproved.com/p/box3d.md): 14 recommend - [Box2D](https://hackerapproved.com/p/box2d.md): 12 recommend - [MuJoCo](https://hackerapproved.com/p/mujoco.md): 10 recommend - [Rapier physics engine](https://hackerapproved.com/p/rapier.md): 6 recommend - [BepuPhysics 2](https://hackerapproved.com/p/bepu-physics.md): 6 recommend ## Cite as Hacker Approved, "Jolt Physics", https://hackerapproved.com/p/jolt-physics/ (counts from 1,795,640 Hacker News comments, November 2025 to November 2026).