# Calculator Xbar and S Charts

> Calculator Xbar and S Charts (iPhone/iPad app by Francisco Aparisi.)

- Source: https://appshunter.io/ios/app/calculator-xbar-and-s-charts/id1085185552 (this page in markdown: same URL + `.md`)
- Developer: [Francisco Aparisi](https://appshunter.io/developer/1084055472)
- Category: Productivity
- Price: Free
- Age rating: 4+
- Requires: iOS 8.0 · 33 MB
- Languages: English
- Released: 2016-02-23
- Data updated: 2026-05-19
- User reviews in markdown: https://appshunter.io/ios/app/calculator-xbar-and-s-charts/id1085185552/reviews.md

## What is Calculator Xbar and S Charts?

This application computes the ARL for Xbar, S and combined Xbar-S control charts for different mean and sigma shifts. It shows where to place the control limits for different in-control ARLs.

In addition it plots the ARL curve for mean or sigma shifts.

Moreover, it is possible to compare two sampling plans (sample size and frequency of sampling) in order to find the most efficient one to detect a process shift (smaller ATS). And it is possible to optimize the sample size for a given shift to minimize the ATS.

There is a twin version for OS X available in its store.

Available languages are at the moment Spanish and English.


## Version history (last 1 release)

### 2.5 — 2019-10-04

Solved an issue when the mean shift was negative with only lower control limit

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## More apps by Francisco Aparisi

- [Power of Hypothesis Testing](https://appshunter.io/ios/app/power-of-hypothesis-testing/id1084055473)
- [ARL Xbar Control Chart](https://appshunter.io/ios/app/arl-xbar-control-chart/id1085519193)
- [XBar control chart with VSS](https://appshunter.io/ios/app/xbar-control-chart-with-vss/id1085694274)
- [ARL simulator EWMA control chart](https://appshunter.io/ios/app/arl-simulator-ewma-control-chart/id1088604146)
- [Optimum EWMA control chart](https://appshunter.io/ios/app/optimum-ewma-control-chart/id1088666755)

All apps by Francisco Aparisi: https://appshunter.io/developer/1084055472

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-05-19.*