# Open Flow Pro > Hydraulic property calculator for open channels, orifices, weirs, and flues. (iPhone/iPad app by AppsAndCode LLC.) - Source: https://appshunter.io/ios/app/open-flow-pro/id376583527 (this page in markdown: same URL + `.md`) - Developer: [AppsAndCode LLC](https://appshunter.io/developer/376583530) - Category: Productivity, Reference - Price: $0.99 - Rating: 1.00/5 from 1 App Store ratings · 10 written reviews indexed - Age rating: 4+ - Requires: iOS 7.0 · 20 MB - Languages: English, German - Released: 2010-06-13 - Data updated: 2026-06-10 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/open-flow-pro/id376583527/reviews.md ## What is Open Flow Pro? Incredible value, universal app completely redesigned for iOS7!!  Buy once ran on both iPhone and iPad. We believe Open Flow Pro will save you time and increase your productivity.  Quickly calculate the quantities you need. Respond quickly and with confidence when asked questions about your project in meetings. Designed by engineers, for engineers. OpenFlow Pro is a simple intuitive application for calculating flows, velocities and other hydraulic properties of open channels, orifices, weirs, and flues. It support several open channel and weir cross-sections including circular, trapezoidal, rectangular and triangular sections. Several flume calculators are also included. Calculators included extended results in addition to the primary variable that you solve for. Now includes a reference section with constants and coefficients. FEATURES: 1. Provides results in both ENGLISH and METRIC UNITS! 2. Includes Open Channel calculator 3. Includes an ORIFICE calculator 4. Includes a WEIR calculator 5. Includes a FLUME calculator 6. Comprehensive look up table of over 70 manning's n-values for various materials in various conditions, and orifice coefficients 7. Shows formatted equations that are used in most of the calculations ## Key features - Open channel calculations - Orifice calculations - Weir calculations - Flume calculations - English and metric units - Manning's n-values lookup ## Recent user reviews (10 of 10) All indexed reviews: https://appshunter.io/ios/app/open-flow-pro/id376583527/reviews.md ### 1/5 — Not a good program *2015-03-11* Very, very, very slow. Poor interface. Don't wast your money. ### 1/5 — App calculates incorrectly. *2012-12-11* The calculation for orifice discharge is not correct. The app uses the height from the invert of the orifice rather than the center point. This makes the discharge calculation incorrect. I emailed AppsAndCode about this issue weeks ago, but they have not corrected the problem. ### 4/5 — nice app *2011-07-06* it supports inches for pipes and the last update was pretty good. ### 1/5 — Waste of money *2011-05-26* Don't waste your money.I'll change my rating when you fix this app ### 3/5 — Good app, great idea, needs tweaking *2011-05-26* Need to add a pull down menu to select Manning's n from the table, need to be able to select the units for input (inches and mm), need to be able to solve for any of the given variables. Will be very handy once these issues are addressed. No crashing problems on my 3GS. ### 1/5 — Needs some work *2011-01-22* Should be able to solve for any variable. Should have inches as units, esp for orifice. Please update and I'll change rating. ### 1/5 — What the hell! *2010-12-27* I just bought this app for my iPad and it closes as soon as it opens. What a rip off!! ### 4/5 — Open Flow Pro - Now in Metrict. *2010-11-07* Congratulations for rapid response to feedback requesting a genuine metric version. This is now a useful toolkit to have in the iPhone for calculating some common open channel flow situations. Access to mannings n is great, but some guidance on coefficient selection for the weir and orifice calculators would make it just that little bit more useful for those not quite so experienced in them. ### 3/5 — Nice First Effort, But . . . *2010-08-02* Nice first effort, but would be more useful for design purposes if you could solve for any of the channel variables. Also, add the ability to create irregular cross sections and the ability to scroll up (or down) the variable input screens when the keyboard is up so that you can access hidden variable fields. ### 5/5 — This is what we have been waiting for *2010-06-19* Simple app to use but really top marks for results. ## Frequently asked questions about Open Flow Pro ### What is Open Flow Pro used for? Open Flow Pro is a productivity tool designed for engineers to quickly calculate hydraulic properties of open channels, orifices, weirs, and flues. It supports various cross-sections and provides results in both English and metric units. ### What types of calculations does Open Flow Pro offer? Open Flow Pro includes calculators for open channels, orifices, weirs, and flumes. It also features a comprehensive lookup table for manning's n-values and orifice coefficients. ### Does Open Flow Pro support both English and metric units? Yes, Open Flow Pro provides results in both English and metric units, making it versatile for different project requirements and user preferences. ### What devices is Open Flow Pro compatible with? Open Flow Pro is a universal app designed for iOS devices, including iPhone, iPad, and iPod. It was purchased once and runs on both iPhone and iPad. ### How often is Open Flow Pro updated? The latest version of Open Flow Pro is 4.5, and it was last updated on June 20, 2014. Users can expect a stable experience based on its last update. ### What is the price of Open Flow Pro? Open Flow Pro is available for a one-time purchase of $0.99. This price grants access to all its features on supported iOS devices. ### Does Open Flow Pro have ads? No, Open Flow Pro does not contain advertisements. As a paid application, it offers an ad-free experience for its users. ### What is the age rating for Open Flow Pro? Open Flow Pro has an age rating of 4+. This indicates it is suitable for users of all ages, with no mature content. ## Version history (last 5 releases) ### 4.5 — 2014-06-20 Completely re-designed for IOS 7 Added a flume calculator and an entire reference section with coefficients, manning's n values and more. ### 4.0 — 2012-07-12 Huge upgrade!!! Now on the iPad. Buy once get both the iPhone version and the iPad HD version. Completely redesigned with a beautiful fluid interface. Equations module added. Complete overhaul! ### 3.2 — 2011-07-20 Streamlined workflow ### 3.1 — 2011-07-01 Channel component now allows you to solve for Manning's N and slope in addition to flow. ### 3.0 — 2011-05-06 Totally revamped user interface. ## Apps similar to Open Flow Pro | App | Rating | Price | Category | | --- | --- | --- | --- | | [Civil Site Engineer App](https://appshunter.io/ios/app/civil-site-engineer-app/id6474285109) | — | $4.99 | Productivity | | [Sulhnu](https://appshunter.io/ios/app/sulhnu/id1529393420) | 4.5 (2) | Free | Productivity | | [Pipe Sizer - Water](https://appshunter.io/ios/app/pipe-sizer-water/id1316033381) | 4.8 (10) | $12.99 | Productivity | | [Mobile Electrician](https://appshunter.io/ios/app/mobile-electrician/id1210782465) | 2.6 (5) | $4.99 | Productivity | | [FEM BLOCKi - 3D Finite Element](https://appshunter.io/ios/app/fem-blocki-3d-finite-element/id1450345941) | 4.0 (1) | Free | Productivity | | [Meine GFI](https://appshunter.io/ios/app/meine-gfi/id1421013700) | — | Free | Productivity | ## More apps by AppsAndCode LLC - [Tithe Tracker](https://appshunter.io/ios/app/tithe-tracker/id519612799) All apps by AppsAndCode LLC: https://appshunter.io/developer/376583530 --- *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.*