0.41.0

Rerun is an easy-to-use database and visualization toolbox for multimodal and temporal data.

• Python: pip install -U rerun-sdk
• Rust: cargo add rerun and cargo install rerun-cli --locked
• C++ FetchContent: https://github.com/rerun-io/rerun/releases/download/0.41.0/rerun_cpp_sdk.zip
• Online demo: https://rerun.io/viewer

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✨ Overview & highlights

• Automatic visualization of raw ROS messages: the Viewer sets up component mappings for common std_msgs and sensor_msgs types

  

• New streaming dataset-query pipeline, enabled by default, with bounded memory and reliable cancellation

• Copy table cells, rows, and selected rows from the context menu

  

• Hovering a truncated value shows all of it in a tooltip (video)

• The text log view loads data lazily and scales to much larger logs

• The web viewer wasm is served with Brotli, a 35% smaller download

🧪 Experimental and unstable

These may change in future releases, and unstable types may not stay backwards compatible.

• Table columns show and edit any component type (video)
• Python ViewerClient can read schemas, read and write blueprints, run commands, and take screenshots
• Typed viewer API in the JS web viewer, with a viewer_control example
• Segment preview time controls in the table blueprint

📖 Release notes: https://rerun.io/docs/changelog/changeset-0-41#highlights

⚠️ Breaking changes

• Chained filter_contents() calls intersect
• Table blueprints: Column(cell=…) is now Column(column_type=…), and the *Cell classes are removed
• Duplicate and segment-limit registration failures are reported by the registration task
• ViewerClient.set_time takes a play_state
• Rust 1.98 is the minimum supported version
• Rust: build_info() removed, the binary passes in its build info

🧳 Migration guide: https://rerun.io/docs/changelog/changeset-0-41#breaking-changes

🔎 Details

🌊 C++ API

• Configurable gRPC flush timeout in the C and C++ SDKs 595ba5f

🐍 Python API

• Add every ViewerControl operation to the Python ViewerClient 4e7c6f0
• Improve SetTimeCursor ViewerControl API d0ec12d
• Rename GetViewerState to GetState 2a19757
• Fetch the dataset schema once per dataset revision aa0bfe3
• Optionally account for assets with segment.schema() and use /GetSchemas when available 01054be

🦀 Rust API

• Update to Rust 1.98.1 344e1c9
• Only embed build info in top-level binaries fa4f449

🪳 Bug fixes

• Rely on TLS certificates provided by the OS for all requests 6aae3bb
• Bump pulldown-cmark to 0.13.5 for RUSTSEC-2026-0414 6da992a
• Fix incorrect behavior of DatasetSelection with no segments selected 2430ac9
• Prevent overwrites from concurrent write access grants b2639ae
• Fix chunk-scanner cache memory accounting 40c31ae
• Loading spinner next to Catalog name for ongoing registrations 0c35191
• Fix default blueprint sometimes not loading for recordings that were shown as previews c79700f
• Fix empty rows for video streams & encoded images c50ba3a
• Keep up better when keyframes are logged in the live case 6c6d00a
• Fix undo history filling up when the JS or gRPC API changes the time 447b630
• Fix hardcoded units in spatial depth labels a576790
• Fix Arrow type hover labels overlapping scrollbars 7050fa0
• Fix missing grpc-status trailer on web viewer 9c4e5c4
• Web viewer: import ./re_viewer.js with its extension, so it works without a bundler f3e2374
• Fix audio issues on web a9880d0

🌁 Viewer improvements

• Automatic visualization of raw ROS messages through heuristic component mappings e88ef2e
• Use rerun components for table columns f4626ea
• Show arrow ui tooltip when hovering truncated table fields 24b39d1
• Preview time controls in blueprint a3e5790
• Start previews at their midpoint b9a651e

🗄️ OSS server

• Report duplicate and segment-limit registration failures through the registration task f9eb37f

🚀 Performance improvements

• Text log view no longer queries entire timeline, making it much more scalable f6161a3
• Serve the web viewer wasm with Brotli (35% smaller download) aca2d09

🖼 UI improvements

• Allow copying table cells and rows 7947439

🕸️ Web

• Add WebViewer methods for all ViewerControl commands 6b16fd7
• Move the WebViewer time and recording methods onto the Viewer Control API e5fc7f0
• Async WebViewer.open and close, through ViewerControl b4b4a11
• Take screenshots over ViewerControl as PNG bytes, and in the web viewer 16350de

🤷‍ Other

• Replace cargo-run-wasm with a Python script for re_renderer web examples #12982 (thanks @michele-xilo!)