XmR

a statistical process control chart (graph), letting you concentrate on significant changes to a metric - see (2023-02-06) Chin How To Become Data Driven

XmR-it is a free tool to use instead of spreadsheet: https://xmrit.com/

• how-to: (2024-08-28) Xmrit Course
• what if there's a trend? see "XmR Trend Chart" - XmR-it added that in 2025 (although you can only apply trend-calculation between 1 pair of dividers)