# PercentDiff - the Shaolo Percent and Percentage Calculator > Multi-result calculator for percentage changes and calculations. (iPhone/iPad app by Shaolo LLC.) - Source: https://appshunter.io/ios/app/percentdiff-the-shaolo-percent-and-percentage-calculator/id421692417 (this page in markdown: same URL + `.md`) - Developer: [Shaolo LLC](https://appshunter.io/developer/421692420) - Category: Productivity, Utilities - Price: Free - Rating: 4.90/5 from 152 App Store ratings · 217 written reviews indexed - Age rating: 4+ - Requires: iOS 9.0 · 2 MB - Languages: American English - Released: 2011-03-02 - Data updated: 2026-07-30 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/percentdiff-the-shaolo-percent-and-percentage-calculator/id421692417/reviews.md ## What is PercentDiff? If you think the app is anything less than 5 stars, we want to hear from you directly! Do you have something you would like us to add or a complaint? Please contact us via the About tab. We can't reply to reviews. Follow us on twitter: shaolollc We love user feedback, please keep sending us email (preferably with something in it. I get a lot of empty email! PercentDiff is the original multi-result percent calculator application. Using PercentDiff is incredibly easy. There are two tabs. One for two numbers, and one for a number and a percentage. Input your numbers on either tab and all values will be calculated. The two modes currently available are: A. % Change (Number 1 to Number 2) This mode will calculate: 1. Percent increase ** This mode can also be used to calculate gross sales markup 2. Percent decrease ** This mode can also be used to calculate gross margin 3. Percent difference 4. Number 1 as a percent of Number 2 5. Number 2 as a percent of Number 1 B. % Of (Percent of number) This mode will calculate: 1. Percent of X 2. X plus percent ** Can also be used to calculate markup on a product 3. X minus percent ** Can also be used to calculate markdown on a product 4. X as a percent of an original number 5. X as a percent increase of an original number 6. X as a percent decrease of an original number We strive to make our apps as simple to use as possible. Please FEEL FREE TO EMAIL US feedback. We would like to know how users interact with the app and how we can improve upon it. ## Key features - Calculate percent increase/decrease - Calculate percent difference - Calculate number as a percent of another - Calculate percent of a number - Calculate markup/markdown ## Recent user reviews (10 of 217) All indexed reviews: https://appshunter.io/ios/app/percentdiff-the-shaolo-percent-and-percentage-calculator/id421692417/reviews.md ### 5/5 — Unbeatable percentage calculator *2025-09-20, version 2.61* Well aid out.Super easy to use and understand.Calculates percentages in all the ways you need it calculated.My only fear is that one day it is not compatible with a new version of iOS as no other percentages app fulfils the functions this does. ### 5/5 — Simple and Free *2025-01-12, version 2.61* This is by far a treasure if you are always calculating percentages. No ads, no cunning marketing tactics it is simple and free; deserves every bit of a 5 stars plus rating. ### 5/5 — great but *2024-10-05, version 2.61* I’ve been using this for a few years, I’m hopeless at maths, so it’s really useful when it comes to adjusting flour / water ratios when I bake. However a bug has crept in somehow, I think it occurred when I changed my ipad mini from gen 4 to gen 6, the symptoms are…. at the bottom of the screen the row of symbols 0 _ +/- Done are only half visible ( only the top third) and therefore difficult to select, it takes several jabs. ### 5/5 — Absolutely the BEST and most FUNCTIONAL app! *2024-01-27, version 2.61* If you work with numbers in any way shape or form, this app belongs in your phone. The developers have widely resisted the foolish idea to tack on unnecessary noise or annoying ads. I would happily pay for this app, and I hope it remains, and it’s current, pristine, amazingly functional form. To the developers, thank you! I hope you introduce away for us to optionally support you… Something similar to Wikipedia. ### 5/5 — Very useful *2023-08-21, version 2.61* Been using this app for years and always comes in handy! ### 5/5 — Great app *2023-05-24, version 2.61* I love this app….you can choose different percentage outcomes which I use all the time, because I don’t particularly need it to just work out a straight percentage of something. ### 5/5 — 6 out of 5 stars, a perfectly made app *2023-02-22, version 2.61* I use this daily to calculate the entry and exit point of my stock trades. Thank you for making such a clean, simple, well designed, functional, and easy to use product. Only small gripe, no sound or haptic feedback when you key in values. This is personal preference only. ### 5/5 — Pure and simple perfection *2023-01-13, version 2.61* I cannot say enough about this app! Unbelievably useful. Unbelievably simple. ### 5/5 — Love this app! *2022-12-09, version 2.61* Been using this app for several years without any flaws! It is great. I use it to help price my products, determine differences between numbers at work, grade tests for school. Highly recommended. Two thumbs up! ### 5/5 — Many uses *2022-11-19, version 2.61* This app is one of the best. Has been handy when dining out and shopping but is awesome when you need to buy something and want, say, a 15% overage. I’ve used this in construction projects, boating projects, and many others. Let’s add a little more functionality with maybe an area calculator including odd shapes and also volume including odd sizes. Maybe even a plain calculator or wait! How about adding fraction calculator?? Thanks for a great app! ## Frequently asked questions about PercentDiff ### What does PercentDiff do? PercentDiff is a multi-result percentage calculator. It helps you easily compute various percentage-related calculations, such as percent increase, decrease, difference, and finding a percentage of a number. ### What are the main features of PercentDiff? The app has two main modes: '% Change' for calculating the percentage change between two numbers (increase, decrease, difference, and ratios) and '% Of' for calculating a percentage of a number, including markups and markdowns. ### Is PercentDiff free to use? Yes, the application is available for free. There are no in-app purchases or advertisements mentioned, indicating a completely free user experience. ### Who would benefit from using PercentDiff? This app is designed for anyone who frequently needs to perform percentage calculations. This includes students, sales professionals for markup/markdown calculations, and individuals managing personal finances. ### How does the '% Change' mode work? In '% Change' mode, you input two numbers. The app then calculates the percent increase from the first to the second number, the percent decrease, the overall percent difference, and how each number relates as a percentage of the other. ## Version history (last 5 releases) ### 2.61 — 2015-09-29 This app has been updated by Apple to display the Apple Watch app icon. The one about the keyboard. Some devices are not properly rendering the vibrancy in the keyboard blur view. The easiest way to fix this is to use the global tint color on the keyboard. I'm still looking in to the idea of themes. If it's added, it will be an IAP. ### 2.6 — 2015-09-19 Minor UI update. Compatibility with iOS 9. Let us know if you like the new version. ### 2.5.4 — 2013-05-02 2.5.4: → Fixes typo's in Help files (thank you Kathy). 2.5.3: → Fixes a critical iOS 5 bug. ‣ Should be safe for everyone to update now. If you have ANY issues, please email me from within the app. 2.5.2: → Updated the UI and changed the color. → Added help screen replete with equations and descriptions. → Can now email results from inside app. (tap result and then tap black arrow on menu). → Input values, and selected tab are now saved. Even if you kill the app, all the values will be remembered. → Results table can now scroll above the keyboard. → Swap inputs by tapping on the labels beside the text boxes. Future versions will require iOS5 and then eventually iOS6. ### 2.5.3 — 2013-04-18 2.5.3: → Fixes a critical iOS 5 bug. ‣ Should be safe for everyone to update now. If you have ANY issues, please email me from within the app. 2.5.2: → Updated the UI and changed the color. → Added help screen replete with equations and descriptions. → Can now email results from inside app. (tap result and then tap black arrow on menu). → Input values, and selected tab are now saved. Even if you kill the app, all the values will be remembered. → Results table can now scroll above the keyboard. → Swap inputs by tapping on the labels beside the text boxes. Future versions will require iOS5 and then eventually iOS6. ### 2.5.2 — 2013-04-17 I'm getting reports this is breaking on iOS 5.1. If you use iOS5, please do not update your copy of the app. UI changes. Help screen with equations The ability to email results - tap on a result. Input values are now saved and will persist indefinitely. The results table can now be scrolled above the keyboard. Future versions will require iOS 5 or iOS 6 as a minimum. Please upgrade. If you're unable to upgrade and absolutely require a feature, please email me from within the application. ## Apps similar to PercentDiff | App | Rating | Price | Category | | --- | --- | --- | --- | | [Thetis Tools](https://appshunter.io/ios/app/thetis-tools/id1460268980) | — | Free | Productivity | | [ZappID](https://appshunter.io/ios/app/zappid/id1455029820) | — | Free | Productivity | | [SyncOnSet 5.0](https://appshunter.io/ios/app/synconset-50/id1460160860) | 1.8 (60) | Free | Productivity | | [Jumpstash](https://appshunter.io/ios/app/jumpstash/id1465670860) | 4.2 (5) | Free | Productivity | ## Related topics [percentage difference](https://appshunter.io/ios/topics/percentage-difference) · [percent change](https://appshunter.io/ios/topics/percent-change) · [percent](https://appshunter.io/ios/topics/percent) · [percent change calculator](https://appshunter.io/ios/topics/percent-change-calculator) · [markup percent](https://appshunter.io/ios/topics/markup-percent) --- *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 2026-07-30.*