Deterministic native physics and simulation runtime for games, tools, robotics, and rollback-capable systems.
Arctic Codex now has two public lanes: the flagship UPE evaluation and licensing path, plus a live store for practical browser utilities. Review proof if you are evaluating the engine, or head to the store if you want a smaller local-first tool.
Ready for the next step? Buy Standard License · Request Evaluation · Returning customer? View My Orders
What UPE is
Deterministic runtime
Fixed-step simulation with replay, snapshots, and state hashing designed for rollback-capable and auditable workflows.
Native source integration
C++20 core with a stable C API boundary and no mandatory runtime dependency chain beyond the standard library.
Modular scientific breadth
Core physics first, with applied packs and broader scientific tracks layered in without pretending every domain has identical maturity.
Proof at a glance
Other Software Tools — live now
Not every buyer is here for a physics engine. Arctic Codex also sells practical browser utilities with clear one-time pricing, local-first behavior, and direct product pages.
web2txt-output.txt • title • URL • readable export
Web2TXT
Turn a messy tab session into one clean `.txt` file for research, prompt prep, and archiving.
scan page ✓ filter links ✓ preview results ✓ open capped tabs
All Tabs Open
Control multi-link browsing on wiki and docs pages without opening a browser full of junk tabs.
What it is for
Game engines / gameplay systems
Rigid-body core, contact handling, vehicles, articulation, and constraint behavior for production gameplay integration.
Rollback networking / replay systems
Snapshots, deterministic stepping, replay, and state hashing for rollback-capable workflows and time-travel debugging.
Robotics / control / simulation
Constraint chains, articulated motion, reproducible stepping, and a clear evaluation boundary for control-oriented uses.
Internal tooling / digital twin / R&D
Dependency-light native integration for headless tools, simulation experiments, and audit-friendly runtime inspection.
Why it is different
- Determinism where the proof surface is visible, not implied.
- Replay, snapshots, and hashing as part of the product boundary.
- Clean native integration through a stable C API and C++20 core.
- A buyer-facing verification surface: docs, examples, logs, benchmarks, and maturity notes.
- Modular domain expansion beyond the core without pretending every module has identical maturity.
Featured demos
Verify stable resting contact, stacking behavior, and absence of explosive jitter under repeated stepping.
View testShow that a captured world state can be restored and resumed without diverging from the reference path.
View testDemonstrate world-aware suspension, steering behavior, and vehicle response over uneven ground.
View testShow continuous particle emission, spread, gravity, and collision-driven scatter in a readable engine-backed field test.
View testShow pinned-edge cloth response, wind-driven motion, and soft-body stability in a visually legible scene.
View testVisualize SPH fluid particles, water-like slosh, and buoyancy / drag on a floating body in a compact tank scene.
View testShow a rollback-oriented flow where the engine rewinds and re-simulates under deterministic assumptions.
View testPut benchmark behavior in motion by showing the named workloads used for performance review and regression tracking.
View testLicensing summary
- Non-exclusive commercial source license. UPE is licensed, not sold by default.
- Ownership retained by Arctic Codex. The engine itself is not transferred or white-labeled as a third-party standalone product.
- Internal modification allowed under agreement. Licensees can adapt the code to fit their shipping product or internal system.
- Shipping inside customer products is allowed. What is restricted is resale, reposting, or sublicensing UPE itself.