# PowerOne calculator — Finance, scientific, and more > Versatile calculator app with pre-built and custom templates for various calculations. (iPhone/iPad app by Crafty Weasel, LLC.) - Source: https://appshunter.io/ios/app/powerone-calculator/id1141498515 (this page in markdown: same URL + `.md`) - Developer: [Crafty Weasel, LLC](https://appshunter.io/developer/1602588690) - Category: Utilities, Finance - Price: Free with in-app purchases - Rating: 4.60/5 from 803 App Store ratings · 101 written reviews indexed - Age rating: 4+ - Requires: iOS 17.6 · 6 MB - Languages: American English - Released: 2018-02-12 - Data updated: 2026-08-30 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/powerone-calculator/id1141498515/reviews.md ## What is PowerOne calculator? Download hundreds of calculations or create your own with PowerOne® calculator. • Several-time Apple staff pick + Best of 2010 • "The crème de la crème of calculators" – AppAdvice • "Incredibly powerful tool for calculations of all kinds." – Smokin' Apps • "You need this calculator. It's miles better than the competition." – Robert Burns • "… sets the benchmark for other calculators to reach." – Fred Swan • "Not sure how I could do my job without PowerOne." – Arvid Martin • "A legend. The best … calculator app I have ever seen." – Worldwide Tech • "… PowerOne shines." – The Mac Observer BENEFITS/FEATURES • Quick and accurate. Templates act similar to locked-down, mini-spreadsheets that increase accuracy and speed for repetitive calculations. Enter the data you know. PowerOne will calculate the rest. • For those one-off calculation needs, PowerOne provides a powerful standard and RPN calculator. Over a hundred functions to help with virtually anything: basic math, powers, logs, trigonometry, probability, programmer’s math, fractions, and Imperial and metric units. • Get up and running fast with hundreds of pre-created templates in PowerOne's extensive library. Covers everything: finance, conversions, real estate, business, investing, construction, engineering, health, fitness, and more. • While some calculations are common, there are millions more specific to you or your business. With PowerOne, it is easy to create powerful templates of your own using our intuitive language. You, your team, and your customers can perform their own calculations without ever having to think about the math. • Access PowerOne everywhere. Whether on the go with your iPhone or iPad, on your M1 Mac, or at your desk on the web, PowerOne makes sure your critical calculations are available at your fingertips, offline or on. • Keep everyone on the same page. Share your templates with your team and customers, ensuring that everyone is performing the same error-free calculations every single time. • Highly customizable. Go beyond templates with expanded calculator functions and themes! Match your mood and make it the product you want to use every day. After more than 25 years and over 30 million software calculators distributed, PowerOne has earned its reputation for high-quality apps. We'd love to hear from you. Please visit us at https://power.one, or share ideas, get help, and resolve problems by emailing us at help@power.one. PRIVACY PowerOne uses anonymous accounts so we don't know who you are but still provide great benefits such as syncing across devices. AVAILABLE FOR FREE • Run PowerOne offline on your iPhone, iPad or M1 Mac • Run PowerOne online at https://power.one • Full-featured standard and RPN calculator (iOS only) • Access to over 200 library templates • Sample creating your own templates • Share template results via email • Go light or dark with your choice of two themes • Keep your devices in sync automatically AVAILABLE IN PREMIUM • Over 300 library templates • Create your own templates without limit • Share templates with other Premium subscribers • Access any of the built-in extensions to share or save your results • Choose from 12 themes to customize PowerOne • Support independent iOS developers and your favorite calculator's development! SUBSCRIPTION DETAILS PowerOne is free to use with some features available via monthly or annual subscription. Payment will be charged to your iTunes account at confirmation of purchase and your subscription will automatically renew unless auto-renew is disabled at least 24 hours before the end of the current subscription period. Automatic renewals will be charged at the same price you were originally charged for the subscription. Please note that subscriptions can be managed by choosing that option via Account within PowerOne or via Account Settings on the App Store after purchase. Terms: https://power.one/terms Privacy Policy: https://power.one/privacy ## Key features - Hundreds of pre-built calculation templates - Create custom calculation templates - Standard and RPN calculator modes - Cross-device syncing (iPhone, iPad, Mac, Web) - Offline access - Template sharing for teams - Customizable themes ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | Annual Premium Subscription | $19.99 | per year | | Monthly Premium Subscription | $2.99 | per month | ## What do users think of PowerOne calculator? Overall sentiment: neutral **Pros** - 🚀 Powerful and versatile calculator - 👍 Extensive template library - 🚀 Customizable keyboard and layout - 👍 Helpful customer support - 🚀 Syncing across devices **Cons** - 🔒 Requires account login - 👎 Subscription pricing model - 👎 Cluttered and less user-friendly interface - 👎 Removed features from previous versions - 🐛 Bugs and glitches **Commonly reported bugs** - Calculator not accessible after update - Templates disappearing after update - Incompatibility with iOS 16 - Calculation errors in certain templates **Most requested features** - Landscape mode support - Ability to reorganize templates - Restore previous version's interface - Retain access to purchased features ## Recent user reviews (10 of 101) All indexed reviews: https://appshunter.io/ios/app/powerone-calculator/id1141498515/reviews.md ### 5/5 — Greedy *2026-05-27* I’ve had the earlier version of this on my iPad for years. I’ve written dozens of templates for custom applications I used in the office. I was aware that they were no longer supporting it, but when I had to restore my iPad, it couldn’t download the app because they took it off the server. That’s the Apple server, the App Store. And all this because they weren’t charging for the first one and discovered that they could charge for the second one. They’re lame excuse “due to a massive server, crash“ was such a cop out. I’m a programmer and you know exactly how these things work. It’s a total cop out and now I’ve lost a good calculator. I would gladly pay a flat fee for the original version to be able to restore all the templates I have written. **Developer response:** Hi Namaste122112, I discontinued PowerOne Finance Pro, Scientific Pro and the free versions in 2018. Unfortunately they no longer function on Apple’s latest OS version, but my latest version, PowerOne 6, does and is available here: https://power.one/ios Fundamentally the templates are the same. (Tap + at the top of the list then Add from Library to add any templates you are interested in.) The calculator is now available from all screens and offers a lot more customization options. Also, if you have PowerOne on multiple devices and signed into the same account, all of your templates and calculations will sync. I promised to provide the same functionality as you previously had so you didn’t lose anything in the process. This used to be automatic but with the old app no longer functioning I can only add these for those who write in. With that and once you install, run and tap Get Started, tap ••• in the top, right corner of the list then Account and send me the anonymous email address listed. I can add free template creation and premium templates. Other items will still be available for subscription if you so choose. If you have access to the old version on your old iPad or exported your templates for safe keeping, I’m happy to help you move those to the new version as well. Please email if you would like my help. Elia hello@thecraftyweasel.com ### 1/5 — Terrible *2026-05-27, version 6.4.6* Payed for a yearly subscription and when i go to use it ,nothing works,just asks if i want to pay for subscription ### 1/5 — Miss old app! *2026-03-01, version 6.4.6* PLEASE READ THIS, The old app was way nicer! So handy to flip back and forth from loan to savings. History was better. Displayed on calculator screen. Now it’s not and when you go to history it’s a nightmare to read it. New version is just BAD. I would pay to get old version back! ### 5/5 — Update on “Wipes Out All My Library” *2026-02-18* The dev got back to me with an easy fix involving logging out & back in on my other device. It’s now a great app again with all my library intact! One of my most useful apps because I like to write my own single-purpose calculator mini-apps. Example: What percent of 283 is 47? **Developer response:** Hi tomtrevorrow, Happy to help. There could be a couple of possibilities here, but one of the reasons I built version 6 (the current version) is so we can sync your templates across devices and thus make sure they weren’t lost on a device failure. Were you using PowerOne 6 or an earlier version? Did you move to a new phone and have to log in again/create a new account? Or maybe you were on an earlier version of the app? Whatever the case please email me directly and I will do my best to help. Elia hello@thecraftyweasel.com ### 5/5 — Good program great service *2026-02-10, version 6.4.6* I have used this program for years now. The application has multiple benefits. The customer service has also shown to be quite helpful in the chance of issues that may arise. ### 5/5 — Other Languages *2025-10-08, version 6.4.6* One of the best! It would be great if the app is available in more languages. ### 1/5 — Crooks *2025-10-03, version 6.4.6* I had bought the PowerOne calculator before now. They’ve removed it from the web store so I can buy their subscription only version. This is not on this is criminal and unethical. Please don’t support this company. ### 5/5 — Calculator Was Unavailable — Problem Fixed *2025-08-14* I’ve used PowerOne calculators for a long time, including the previous versions which separated finance features from scientific features. I’ve liked them. A recent update introduced a bug preventing users of the free version from getting to the calculator. That bug was fixed with a new update. Everything is back to working. Great calculator for an iPad or iPhone. So I’ve updated my review to 5 stars. **Developer response:** Hi BillW314, This is an unfortunate bug that was introduced in the previous release. A new version has been released that fixes the issue. You can either wait for Apple to update you automatically or go to PowerOne calculator in the App Store to manually update to the latest version. Elia ### 5/5 — Can’t open calculator *2025-08-14, version 6.4.6* App NO LONGER lets you open the actual calculator. It just keeps insisting on subscribing, and that screen never goes away. UPDATE! They just released another update in the App Store, and this thankfully fixes the issue I reported above. So, the review is now back to 5 stars! ### 1/5 — Used to be able to use without paying *2025-08-13, version 6.4.6* Opened this up today and found I can no longer use the calculator at all without paying. I am paywalled by the “Do more with premium“ ad covering the button that opens the simple calculator. Classy move, thanks for taking away free use. ## Frequently asked questions about PowerOne calculator ### What does the PowerOne calculator app do? PowerOne is a powerful calculator app that offers hundreds of pre-built templates for various needs like finance, engineering, and conversions. It also allows users to create their own custom calculations, ensuring accuracy and speed for repetitive tasks. The app is accessible across multiple devices, both online and offline. ### What are the key features of PowerOne? Key features include access to hundreds of pre-created templates covering finance, real estate, engineering, and more. Users can also create their own custom templates using an intuitive language. It offers standard and RPN calculator modes, cross-device syncing, and offline functionality. Template sharing with teams is also supported. ### Is PowerOne calculator free to use? The app is available for free, offering core functionalities like offline use on iPhone, iPad, and Mac, access to over 200 library templates, and the ability to sample creating your own templates. Premium features are available for purchase. ### What devices is PowerOne calculator compatible with? PowerOne calculator is available on iPhone, iPad, and M1 Mac. It can also be accessed online via a web browser at https://power.one, making it accessible across various platforms and devices. ### How can I use PowerOne for my business? PowerOne is highly beneficial for businesses by allowing the creation of custom templates that ensure error-free calculations for specific business needs. These templates can be shared with team members and customers, standardizing calculations and improving efficiency. The app's accuracy and speed are particularly useful for repetitive financial and operational calculations. ## Version history (last 5 releases) ### 6.4.6 — 2025-08-13 Maintenance release and bug fixes, including resolving crash when creating templates. Also sharing results now adds row numbers to tables and some other behind the scenes improvements. ### 6.4.5 — 2025-08-11 Maintenance release and bug fixes, including resolving crash when creating templates. Also sharing results now adds row numbers to tables and some other behind the scenes improvements. ### 6.4.4 — 2024-12-02 Tracked down and fixed a major crash that was impacting PowerOne, especially on app launch. If you can reproduce a crash in the application, please drop an email to hello@thecraftyweasel.com with steps. ### 6.4.3 — 2024-04-28 Bug fixes and improvements ### 6.4.2 — 2023-10-09 Bug fixes and improvements. ## Apps similar to PowerOne calculator | App | Rating | Price | Category | | --- | --- | --- | --- | | [Calculator +](https://appshunter.io/ios/app/calculator-plus/id351815470) | 4.6 (10,020) | Free | Utilities | | [Calculator₊](https://appshunter.io/ios/app/calculator/id398129933) | 4.7 (1,726,794) | Free | Utilities | | [Calculator +ㅤ](https://appshunter.io/ios/app/calculator-plus/id1597933199) | 4.6 (4,519) | Free | Utilities | | [The Best Calculator - Calc Pro](https://appshunter.io/ios/app/the-best-calculator-calc-pro/id451544502) | 4.6 (4,710) | Free | Utilities | | [Haseba Calculator](https://appshunter.io/ios/app/haseba-calculator/id1121281655) | 4.6 (3,795) | Free | Utilities | | [Calc Pro - The Top Calculator](https://appshunter.io/ios/app/calc-pro-the-top-calculator/id438580059) | 4.7 (358) | $7.99 | Utilities | ## Related topics [power calculator](https://appshunter.io/ios/topics/power-calculator) · [dewalt calculator inches](https://appshunter.io/ios/topics/dewalt-calculator-inches) · [free investment calculator](https://appshunter.io/ios/topics/free-investment-calculator) --- *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 2026-08-30.*