# QC SPC Chart Intro Version — Statistical Quality Control > Interactive statistical quality control charts for manufacturing and process monitoring. (iPhone/iPad app by Quinn-Curtis, Inc..) - Source: https://appshunter.io/ios/app/qc-spc-chart-intro-version/id1399153699 (this page in markdown: same URL + `.md`) - Developer: [Quinn-Curtis, Inc.](https://appshunter.io/developer/1399153698) - Category: Education, Productivity - Price: Free - Rating: 4.20/5 from 5 App Store ratings · 2 written reviews indexed - Age rating: 4+ - Requires: iOS 10.0 · 45 MB - Released: 2018-07-28 - Data updated: 2026-06-10 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/qc-spc-chart-intro-version/id1399153699/reviews.md ## What is QC SPC Chart Intro Version? The QC SPC Chart software is an interactive SPC chart (6-sigma) application aimed at quality control professionals (and students) who want to view industry standard statistical quality control charts on their mobile devices. Typical users will monitor critical quality factors in manufacturing, process, and service industries, and display the results in one of the many supported chart types. Chart types include: variable control charts (XBar-R, XBar-Sigma, Individual-Range, and Median-Range), and attribute control charts for monitoring defects (p-, np-, c-, u-, and DPMO charts). The software will automatically calculate SPC control limits using historical data for the supported variable control chart and attribute control chart types. Alarms can be generated for standard +3 sigma control limits, or the WECO (Western Electric) rules. It will also calculate process capability ratios (Cp, Cpk) and process performance indices (Pp, Ppk). A set of specification limits can also be added to the chart. The SPC charts are displayed as one or two synchronized charts, under the control of a scroll bar. The scroll bar can be replaced by an integrated zoom control which allows for the display of charts with a custom time frame. Auto-scaling of the charts y-axes keeps everything in view. An integrated table appears above the chart, that displays information about the process under view, and each sample interval plotted in the chart. The table displays time, individual sample values, sample statistics, process indices, alarm status, and any notes entered for that sample interval. The user can customize the SPC chart and control limits using built-in setup forms. Both auto-calculated and manually set control limits are supported. The user can manually input and edit sample data from within the program. The user can also import sample data from a CSV (comma separated value) file. The entire chart setup, and data, can be saved on the host device so that they are easily accessible the next time you use the app. You can even set the current setup to be auto-loaded the next time the app starts. The software displays a lot of information on the screen at once, and it is recommended that it be used on devices with a minimum of 1200x800 pixel resolution, landscape or portrait mode. In the student version of the software the total number of sample intervals (data points) which can be displayed at one time is limited to 100. ## Key features - Interactive SPC charts (6-sigma) - Variable and attribute control charts - Automatic control limit calculation - Process capability ratios (Cp, Cpk) - Synchronized chart display with zoom - Integrated data table - Import data from CSV ## Recent user reviews (2 of 2) All indexed reviews: https://appshunter.io/ios/app/qc-spc-chart-intro-version/id1399153699/reviews.md ### 1/5 — Can’t load data from external file *2020-05-15, version 23* How can this be of any value if you cannot load data from an external file?! Loading one by one is .... excruciating. I’m using the free version. If this is an artifact of the free version, they should disclose that in the app narrative. **Developer response:** The program has always been able to load/save the chart setup, and data, from an external file (up to 100 sample intervals for the Free Version). This feature is accessed from the Setup | File menu. For IOS it is documented on pages 35-38 and 43-46 of the online manual. IOS doesn't make it easy getting data files on and off a tablet but it can be done using the procedure described in the manual. "File transfer" is found in the index. ### 5/5 — Excellent for charting analytics *2020-02-11, version 23* Worth paying for the commercial version (low cost btw) for serious statistical process control or analytics app development. However, free version is very handy for learning the SPC Chart tools. If you are in the business of proving six sigma compliance of your quality control then these tools will allow you to show off your data using all the standard methodologies. ## Frequently asked questions about QC SPC Chart Intro Version ### What types of SPC charts does QC SPC Chart Intro Version support? QC SPC Chart Intro Version supports variable control charts like XBar-R, XBar-Sigma, Individual-Range, and Median-Range, as well as attribute control charts for defects such as p-, np-, c-, u-, and DPMO charts. ### How does QC SPC Chart Intro Version calculate control limits? The software automatically calculates SPC control limits using historical data for supported variable and attribute control chart types. Users can also manually set control limits. ### Can I import data into QC SPC Chart Intro Version? Yes, you can import sample data from a CSV (comma separated value) file directly into the application. You can also manually input and edit sample data within the program. ### What are the display capabilities of QC SPC Chart Intro Version? Charts are displayed as one or two synchronized charts controlled by a scroll bar or an integrated zoom control for custom time frames. Auto-scaling of the y-axes ensures all data remains visible. ### What information is available in the integrated table? The integrated table displays time, individual sample values, sample statistics, process indices, alarm status, and any notes entered for each sample interval plotted in the chart. ### What are the device recommendations for QC SPC Chart Intro Version? Due to the amount of information displayed, it is recommended to use QC SPC Chart Intro Version on devices with a minimum resolution of 1200x800 pixels, in either landscape or portrait mode. ### What is the data point limit in the student version of QC SPC Chart Intro Version? In the student version, the total number of sample intervals, or data points, that can be displayed at one time is limited to 100. ### How often is QC SPC Chart Intro Version updated? The latest version of QC SPC Chart Intro Version was released on August 4, 2021. The app was initially released on July 28, 2018. ## Version history (last 1 release) ### 29 — 2021-08-04 If a time stamp was not included in sample interval, or if time stamps have exactly the same value, the software would not sort the data properly for display. The software now injects a unique time stamp when one is not found. If adjacent time stamps have the same values, the software will separate them by a second. ## Apps similar to QC SPC Chart Intro Version | App | Rating | Price | Category | | --- | --- | --- | --- | | [Carolina® RGB Colorimeter](https://appshunter.io/ios/app/carolina-rgb-colorimeter/id6445908681) | 5.0 (1) | Free | Education | | [StatsMate For iPad](https://appshunter.io/ios/app/statsmate-for-ipad/id364905741) | 3.0 (2) | $1.99 | Education | | [GD & T Guide](https://appshunter.io/ios/app/gd-and-t-guide/id1374135977) | 3.0 (9) | Free | Education | | [abacus shapes](https://appshunter.io/ios/app/abacus-shapes/id1370412661) | — | Free | Education | | [Eng Mechanics](https://appshunter.io/ios/app/eng-mechanics/id1526030024) | 4.7 (3) | Free | Education | | [Izzy Statistics](https://appshunter.io/ios/app/izzy-statistics/id1607714425) | — | Free | Education | ## More apps by Quinn-Curtis, Inc. - [QC SPC Chart Standard](https://appshunter.io/ios/app/qc-spc-chart-standard/id1417375075) All apps by Quinn-Curtis, Inc.: https://appshunter.io/developer/1399153698 --- *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 2026-06-10.*