Starting from V4.0.0, STDF processing core in STDF-Viewer is re-written in Rust , its parsing speed is comparable to C and it’s memory safe, the stdf library that I developed is also open-sourced and available in crates.io.

[Improvement & New Features]

• Merge multiple STDF files.
• Side-to-side compare multiple STDF files / merged STDF files.
• Support STDF V4-2007 (STR visualization still needs help)
• Superseded DUTs will be marked in DUT Summary table.
• Add DUT counts in Bin and Wafer statistic table.
• Faster plotting and seamlessly interactivity with pyqtgraph.
• Add some useful tools under Utilities menu.
• Redesigned setting GUI.
• Memory consumption reduced.
• Everything is faster.

[Bug Fix]

• Show real wafer ID in DUT Summary.
• Fix app freezing if there are millions of DTR/GDR.
• Fix error when saving DUT data table in CSV/Excel.
• Yield calculation and plots will exclude superseded DUTs.

[Notes]
Following features that are temporarily dropped in 4.0.0, the main reason is that I still need sometime to familiar with pyqtgraph APIs, they might be added in later releases.

• Boxplot in histogram.
• Gaussian fit in histogram.
• Mean, median line in histogram.
• Hovering tips in histogram and bin chart.