Free, cross-platform XPS (X-ray photoelectron spectroscopy) peak-fitting app with a built-in fit auditor and a citation-backed reference database — the modern XPSPEAK 4.1 replacement. macOS & Windows, GPLv3.
python curve-fitting materials-science spectroscopy xps peak-fitting x-ray-photoelectron-spectroscopy surface-science xpspeak casaxps-alternative
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Updated
Jun 27, 2026 - Python