# What changed in v4.

Release 4.0.0 · 29 September 2026

Danila Karnaukh | v4 | 2026-09-29

## Search and documentation

- Clearer tool titles and descriptions, application structured data and social preview metadata.
- Tool references, unit guidance, two practical tutorials and a full synthetic worked example.
- Internal links, expanded sitemap, Markdown references and a compact llms.txt map.
- WebP version of the decorative hero image with the PNG fallback retained.

## Reproducible plotting

- Save and load dataset-bound JSON settings in both tools.
- PNG export with axes, track legends, fill keys and display summaries.
- Verify plot reports the applied configuration and numerical checks.
- Documented in-page JavaScript commands and a versioned capability catalog.
- One-click examples for density–neutron, density–sonic, four tracks and the cemented interval.

## Existing behaviour retained

The v3 LAS parser, scale and regression calculations, lasso selection, filters, curve styling and display-space fills remain the underlying implementation. v4 does not add automatic interpretation or change LAS measurement values.

## Not part of this release

Remote MCP/WebMCP, chartbook overlays, licensing, automatic unit conversion, cross-page dataset transfer and SVG/PDF export. Search Console ownership verification and publishing require the site owner’s hosting/search accounts; including metadata does not guarantee indexing or ranking.