Jolt Physics
Ranked 4 of 7 physics engines by recommenders
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.
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.
11 people gave an opinion
- recommend it
- 9
- criticize it
- 2
- approval share
- 82%
Recommended in 5 of 13 months
- November 2025: not recommended
- December 2025: not recommended
- January 2026: recommended
- February 2026: not recommended
- March 2026: recommended
- April 2026: recommended
- May 2026: not recommended
- June 2026: recommended
- July 2026: recommended
- August 2026: not recommended
- September 2026: not recommended
- October 2026: not recommended
- November 2026: not recommended (month in progress)
Why it doesn’t carry the badge
- 9 people recommend itNeeds 10 or more, not met.
- 4.5 recommenders for every criticNeeds 2 to 1 or better, met.
- Recommended in 5 of 13 monthsNeeds 4 or more, met.
The same three rules apply to every product, and the badge can’t be bought. How the badge works
What people say about it
The reasons people give, with the number of comments that give each one. Open a reason to read what they said.
Why people recommend it
Each mark is one comment
Deterministic cross-platform networking
“You use jolt for cross-platform determinism with rollback, replicating only inputs.”
Comment from 30 Jun 2026 in “The best thing that's ever happened for multiplayer games?” “Deterministic cross-platform networking with jolt is fine and good”
Comment from 30 Jun 2026 in “The best thing that's ever happened for multiplayer games?” Works well, high quality
“So far Jolt is working pretty well”
Comment from 1 Jul 2026 in “Announcing Box3D :: Box2D” “can be extremely high quality”
Comment from 24 Mar 2026 in “Testing the Swift C compatibility with Raylib (+WASM)” Preferred over Bullet
“i love that we went from bullet being the only real option”
Comment from 1 Jul 2026 in “Announcing Box3D :: Box2D” “Jolt or Bullet for physics.”
Comment from 19 Apr 2026 in “Updating Gun Rocket through 10 years of Unity Engine”
What people warn about
Each mark is one comment
Had problems and gave up
“I even had to give up on Godot's Jolt physics.”
Comment from 29 Jul 2026 in “Shipping Godot VR and Porting to PSVR2: A Partial Post Mortem” “I even had to give up on Godot's Jolt physics”
Comment from 29 Jul 2026 in “Shipping Godot VR and Porting to PSVR2: A Partial Post Mortem” “I don't know why I had such problems with it.”
Comment from 30 Jul 2026 in “Shipping Godot VR and Porting to PSVR2: A Partial Post Mortem”
Other physics engines people recommend
The four most recommended other physics engines, with the same counts for each, so you can compare like for like. The tick on each bar marks the 2 to 1 line the badge needs.
| Product | Recommend | Criticize | Approval | Months | Owned | Badge |
|---|---|---|---|---|---|---|
| Box3D | 14 | 0 | 100% | 1 | — | — |
| Box2D | 12 | 1 | 92% | 1 | — | — |
| MuJoCo | 10 | 0 | 100% | 6 | — | Approved |
| Jolt PhysicsThis page | 9 | 2 | 82% | 5 | — | — |
| Rapier physics engine | 6 | 0 | 100% | 4 | — | — |
What people said
All 14 comments that mention it, newest first. Each links to the original comment.
“I don't know why I had such problems with it.”
“I even had to give up on Godot's Jolt physics.”
“I even had to give up on Godot's Jolt physics”
“quite finicky with typescript, having to have global variable Jolt of type Jolt and using that as a namespace”
“they have a more incremental way of snapshotting physics state”
“a wasm build that has better typescript support”
“So far Jolt is working pretty well”
“i love that we went from bullet being the only real option”
“Deterministic cross-platform networking with jolt is fine and good”
“You use jolt for cross-platform determinism with rollback, replicating only inputs.”
“Jolt or Bullet for physics.”
“can be extremely high quality”
“Also increasingly well integrated into Godot.”
“Firstly, it has been a personal learning project.”
Counts come from 1,795,640 Hacker News comments, November 2025 to November 2026. How we count. Report a mistake.