Process Capability Calculator

Cp, Cpk, Pp, Ppk, control charts, and SPC — built for the shop floor, but equally at home at your desk. The CpK app calculates Cp, Cpk, Pp, and Ppk correctly and keeps them properly distinct, runs full I-MR control charts with 15 SPC diagnostic rules, and tests your data for normality — all explained in plain language, not left as a number you have to trust blindly. Capture readings the way that actually suits the moment: Type them by hand Speak them aloud Scan a printed sheet with your camera Read a live machine display directly, in real time Built entirely on-device. Nothing you enter ever leaves your phone — no account, no internet connection required, no data collected. Your camera, microphone, and readings are yours alone. Honest about its own limits. Low-confidence scans get flagged for you to double-check, and a result gets visibly marked VOID if it looks statistically good but the process is actually out of spec, out of control, or non-normal — because a novice shouldn't be able to mistake a misleading number for a trustworthy one. Free to use for entering data by hand and seeing full, real results — verify it against your own known data before you ever need to unlock anything. The full version adds photo and live-camera capture, voice dictation, PDF reports, CSV export, and saved run history. Built by a quality engineer with 35 years in automotive manufacturing, out of a genuine gap: getting a fast, trustworthy capability check on the shop floor was harder than it should be. This is the tool I wished I had. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/