# Bell Curves - graphing calculator for the normal distribution function > Interactive graphing calculator for normal distribution probability functions. (iPhone/iPad app by Iaroslav Mironov.) - Source: https://appshunter.io/ios/app/bell-curves-graphing-calculator-for-the-normal-distribution-function/id783996056 (this page in markdown: same URL + `.md`) - Developer: [Iaroslav Mironov](https://appshunter.io/developer/640082786) - Category: Education, Productivity - Price: Free with in-app purchases - Rating: 3.00/5 from 2 App Store ratings · 5 written reviews indexed - Age rating: 4+ - Requires: iOS 7.1 · 6 MB - Languages: American English - Released: 2014-01-05 - Data updated: 2026-08-28 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/bell-curves-graphing-calculator-for-the-normal-distribution-function/id783996056/reviews.md ## What is Bell Curves? * Build interactive graphs of the probability density function (PDF) the cumulative distribution function (CDF) for normal distributions * Fit normal and lognormal sample data from CSV files * Visually compare sample distribution with PDF function * Solve PDF/CDF equations graphically * Calculate the sigmas and quantiles Bell Curves is an interactive graphing tool and calculator for the bell curve probability density function. ## Key features - Interactive PDF and CDF graphing - Fit sample data from CSV - Compare sample distribution with PDF - Solve PDF/CDF equations graphically - Calculate sigmas and quantiles ## Pricing and in-app purchases Base price: Free. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Pro Pack | $1.99 | one-time | ## Recent user reviews (5 of 5) All indexed reviews: https://appshunter.io/ios/app/bell-curves-graphing-calculator-for-the-normal-distribution-function/id783996056/reviews.md ### 5/5 — Great Statistics App to understand a PDF and a CDF *2018-01-22* Great Statistics App to understand/ teach the PDF and CDF concepts. Easy to import data. App helps you understand and visualize what happens to the PDF and CDF if you gradually change the mean, sigma, etc. A very simple App but enlightening. ### 1/5 — Porcaria *2016-06-24* Ruim ### 4/5 — Nice *2014-05-15* Nice app that explains everything to you. So even of you don't know how to read the graph it tells you. Good for statistics students who don't have a graphing calculator plus it will help explain stuff to them. ### 4/5 — Bell curves *2014-05-07* This is a really good app to save money with. Graphing calculators are super expensive and you probably wouldn't need later on in life. It's best to use if you specifically need to calculate bell curves. However, that's just the whole function of the app - nothing else. Still super helpful and accurate though. It can be a potential of saving a lot of money. ### 4/5 — Great Side App *2014-05-07* This app is not for everyone. While it looks confusing and the scope may seem narrow it does exactly what it needs to do and is a very nice tool to keep by your side if you do not have a high end TI calculator. I wish it allowed more log functions, but is a great app none the less. ## Frequently asked questions about Bell Curves ### What is Bell Curves used for? Bell Curves is an interactive graphing tool and calculator designed specifically for the bell curve probability density function. It helps users build graphs, fit data, and solve statistical equations related to normal distributions. ### Can I import my own data into Bell Curves? Yes, Bell Curves allows you to fit normal and lognormal sample data directly from CSV files. This enables you to visually compare your own distribution with the theoretical PDF function. ### What statistical functions does Bell Curves offer? Bell Curves enables you to build interactive graphs of the probability density function (PDF) and cumulative distribution function (CDF) for normal distributions. It also allows you to calculate sigmas and quantiles. ### What devices is Bell Curves available on? Bell Curves is available for iPhone, iPad, and iPod devices. It is designed to run on iOS platforms. ### How often is Bell Curves updated? The latest version of Bell Curves is 1.3.9, which was released on June 18, 2015. The app was initially released on January 5, 2014. ### What is the user rating for Bell Curves? Bell Curves has a user rating of 3.0 stars based on 2 ratings. This indicates a mixed reception from its current user base. ### Does Bell Curves have ads? No, Bell Curves does not contain advertisements. As it is free with in-app purchases, users can enjoy an ad-free experience. ### What is the age rating for Bell Curves? Bell Curves has an age rating of 4+, making it suitable for a wide range of users, including younger students learning about statistics. ## Version history (last 5 releases) ### 1.3.9 — 2015-06-18 This app has been updated by Apple to display the Apple Watch app icon. Fixed a crash when loading a file ### 1.3.7 — 2014-06-05 Bugfixes ### 1.3.5 — 2014-05-23 Fixed a crash on a corrupted CSV file. ### 1.3.1 — 2014-04-28 Fixed estimated sigma of the loaded sample ### 1.3 — 2014-04-27 Fixed handling of small sample files (less than 160 records), previously these would produce garbage results. ## Apps similar to Bell Curves | App | Rating | Price | Category | | --- | --- | --- | --- | | [Memorization:Spaced Repetition](https://appshunter.io/ios/app/memorizationspaced-repetition/id6443955900) | — | Free | Education | | [JLI Shluchim Resources](https://appshunter.io/ios/app/jli-shluchim-resources/id1666652660) | — | Free | Education | | [Initiationen](https://appshunter.io/ios/app/initiationen/id6443526080) | — | Free | Education | | [AKE Teacher](https://appshunter.io/ios/app/ake-teacher/id1673653860) | — | Free | Education | | [Worksheet Creator - Teacher AI](https://appshunter.io/ios/app/worksheet-creator-teacher-ai/id1669473620) | 1.3 (3) | Free | Education | | [Redação Nota 1000 ENEM](https://appshunter.io/ios/app/redacao-nota-1000-enem/id1671597780) | — | Free | Education | ## More apps by Iaroslav Mironov - [iOptioneer - option strategies](https://appshunter.io/ios/app/ioptioneer-option-strategies/id640082783) - [Option Show - risk calculator](https://appshunter.io/ios/app/option-show-risk-calculator/id663047289) - [iOptioneer Lt - option risk](https://appshunter.io/ios/app/ioptioneer-lt-option-risk/id674499004) - [True Horizon - camera level with artistic angle modes](https://appshunter.io/ios/app/true-horizon-camera-level-with-artistic-angle-modes/id765088818) - [Cubic Solver - graph and roots](https://appshunter.io/ios/app/cubic-solver-graph-and-roots/id766084603) All apps by Iaroslav Mironov: https://appshunter.io/developer/640082786 --- *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 2026-08-28.*