# Bayes' post-test probability calculator > Medical app to calculate post-test disease probability using test results. (iPhone/iPad app by Keiji Matsui.) - Source: https://appshunter.io/ios/app/bayes-post-test-probability-calculator/id371920137 (this page in markdown: same URL + `.md`) - Developer: [Keiji Matsui](https://appshunter.io/developer/365287272) - Category: Medical - Price: Free - Rating: 3.70/5 from 3 App Store ratings · 2 written reviews indexed - Age rating: 12+ - Requires: iOS 9.0 · 20 MB - Languages: American English - Released: 2010-05-14 - Data updated: 2026-06-24 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/bayes-post-test-probability-calculator/id371920137/reviews.md ## What is Bayes' post? Bayes’ post-test probability calculator, an iPhone / iPod touch application, calculates the post-test probability of diseases from pre-test probability and sensitivity of the test and specificity of the test. positive result: post-test probability for positive result negative result: post-test probability for negative result ## Key features - Calculate post-test probability - Input pre-test probability - Use test sensitivity - Use test specificity - Analyze positive results - Analyze negative results ## Recent user reviews (2 of 2) All indexed reviews: https://appshunter.io/ios/app/bayes-post-test-probability-calculator/id371920137/reviews.md ### 1/5 — Calculations correct? *2018-08-21, version 3.0* Stark but effective interface. Seems to calculate things incorrectly some times, correctly others. Could just be me, but even the screenshot seems wrong: shouldn't 0.65, 0.75, and 0.85 yield 0.62? ### 5/5 — Clinically useful *2014-02-10, version 2.0* Use it in conjunction with ACC/AHA stable angina guideline all the time. Thanks. ## Frequently asked questions about Bayes' post ### What is Bayes' post-test probability calculator used for? Bayes' post-test probability calculator is used to determine the likelihood of a disease after a diagnostic test has been performed. It takes into account the initial probability of the disease and the accuracy of the test itself. ### How accurate is Bayes' post-test probability calculator? The app's accuracy is based on the input data provided by the user. It is a tool for calculation, and its output reflects the accuracy of the sensitivity and specificity values entered for the diagnostic test. ### What information do I need to use Bayes' post-test probability calculator? To use the calculator, you will need the pre-test probability of the disease, the sensitivity of the diagnostic test, and the specificity of the diagnostic test. ### Can Bayes' post-test probability calculator be used for any disease? Yes, the calculator can be used for any disease for which you have the relevant pre-test probability, sensitivity, and specificity data. It is a general-purpose Bayesian calculation tool. ### What devices does Bayes' post-test probability calculator support? Bayes' post-test probability calculator supports iPhone, iPod touch, and Apple Watch devices. ### How often is Bayes' post-test probability calculator updated? The latest version of Bayes' post-test probability calculator was released on February 9, 2016. It has not received updates since then. ### What is the age rating for Bayes' post-test probability calculator? Bayes' post-test probability calculator has an age rating of 12+, making it suitable for users aged 12 and older. ### Does Bayes' post-test probability calculator have ads? No, Bayes' post-test probability calculator does not contain advertisements. ## Version history (last 4 releases) ### 3.0 — 2016-02-09 This app has been updated by Apple to display the Apple Watch app icon. It can be used on an Apple Watch. ### 2.0 — 2013-11-11 Optimized for iOS7. ### 1.1 — 2011-12-14 Following two things have been improved; 1) Layout 2) Clear button has been added. ### 1.0 — 2010-05-14 No release notes. ## Apps similar to Bayes' post | App | Rating | Price | Category | | --- | --- | --- | --- | | [Trail Making Test J Lite](https://appshunter.io/ios/app/trail-making-test-j-lite/id1078507612) | 2.0 (4) | Free | Medical | | [Stroop Test J Lite](https://appshunter.io/ios/app/stroop-test-j-lite/id1095231198) | — | Free | Medical | | [vHIT96da](https://appshunter.io/ios/app/vhit96da/id1369699678) | — | Free | Medical | | [BED Calculator : Radiotherapy](https://appshunter.io/ios/app/bed-calculator-radiotherapy/id397088240) | 5.0 (3) | Free | Medical | | [SVV](https://appshunter.io/ios/app/svv/id1471979816) | — | Free | Medical | | [2chitta for microscope](https://appshunter.io/ios/app/2chitta-for-microscope/id6742305475) | — | Free | Medical | ## More apps by Keiji Matsui - [Gompertz-Matsui Calculator](https://appshunter.io/ios/app/gompertz-matsui-calculator/id365287269) - [Gompertz curve Calculator](https://appshunter.io/ios/app/gompertz-curve-calculator/id369690729) - [肝硬変重症度Child分類・消化器癌進行度分類](https://appshunter.io/ios/app/child/id375548945) - [与芝の式](https://appshunter.io/ios/app/id397979136) - [廃用症候群 Barthel Index・FIM評価表](https://appshunter.io/ios/app/barthel-indexfim/id418877243) All apps by Keiji Matsui: https://appshunter.io/developer/365287272 ## Related topics [bayes](https://appshunter.io/ios/topics/bayes) --- *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 2026-06-24.*