Upload your data and get a complete process capability — cp/cpk report. Free.
Free analyses run on up to 10,000 rows. Larger files are randomly sampled to that size — sign up to analyze your full dataset.
Running process capability — cp/cpk analysis...
Sent to — interactive charts, statistical results, R code, and AI insights.
Analyze another fileStandard-library analysis: a full Cp / Cpk capability study of one measured characteristic against its specification limits. Computes the short-term indices (Cp, Cpk, CPU, CPL) from within-subgroup variation and the long-term indices (Pp, Ppk, Cpm) from total variation, estimates the defect rate in parts per million both as observed and under the normal model, reports the process sigma level, draws the distribution against the spec limits, and tests normality — because the indices assume a normal distribution and mislead badly when it fails. Works on any dataset: map the measured column and supply the limits.
Interactive histogram visualization
Interactive table visualization
Interactive table visualization
Interactive scatter visualization
Interactive bar visualization
Plain-English interpretation — what the numbers mean, what's significant, and what to do next.
Prove to a customer or auditor that a machined dimension meets its drawing tolerance
See our FAQ for details on pricing, data privacy, and how the analysis works. Every report includes a Methodology section showing the statistical test, assumptions checked, and diagnostics run.
Run any analysis on your own data — validated R analyses, interactive reports, AI insights, and PDF export.
Try Free — No Credit CardTell us what went wrong, in your own words. We capture the page you're on automatically, so no need to describe where you are.