Rerun

Rerun is an open source SDK and viewer for multimodal, time-series data, built by Rerun Technologies AB, a remote-first company whose founders are based in Stockholm. It describes itself as the data layer for physical AI, covering logging, storage, query, viewing and training on multi-rate multimodal data in one toolchain. The SDK is dual licensed Apache 2.0 and MIT, carries Python, Rust and C++ APIs alongside a browser based web viewer, and its core is written in Rust. The repository stands at 11.3 thousand stars.

Gaussian splatting arrived in version 0.36.0 as an experimental GaussianSplats3D archetype with a PLY loader, drawn by a new EWA splatting renderer in re_renderer with spherical harmonics to degree 3. A gaussian splat PLY file opens directly in the viewer, and the archetype can equally be logged from any of the three SDKs, taking centers as Position3D with scales, quaternions and colors recommended and sh_coefficients optional. Unlike a training checkpoint it stores values in their natural form, linear scales and base colors with opacity as RGBA. Rerun marks the archetype unstable and warns that the data may not stay backwards compatible, and PLY is the only splat format the release names.

The recording model is why a splat archetype belongs here at all. Rerun stores multi-rate multimodal data as column chunks in rrd files, so a reconstruction can sit on the same timeline as the camera frames, poses and depth that produced it, and the whole recording can then be queried with SQL or a dataframe API rather than exported. That is the same consumption pattern robotics simulators have converged on, where Isaac Sim 6.0 reads NuRec scenes directly.

The viewer installs through pip, cargo, conda, pixi or a community maintained snap, and rerun-cli binaries are published as GitHub release artifacts. Rerun Hub is the commercial layer, a managed catalog over the customer's own S3 compatible storage adding byte range indexing, dataset mixes streamed to GPUs, link sharing, auth and SSO, and single tenant isolation in a chosen region. It is sold through Contact us and carries no published price.