# jCalc – Scientific Calculator — user reviews > 81 indexed App Store user reviews of jCalc by Jon Ericksen, rated 4.60/5 from 247 ratings. - Source: https://appshunter.io/ios/app/jcalc-scientific-calculator/id885770968/reviews - App overview in markdown: https://appshunter.io/ios/app/jcalc-scientific-calculator/id885770968.md - Rating breakdown: 5★ 191 · 4★ 33 · 3★ 9 · 2★ 3 · 1★ 11 ## What do users think of jCalc? Overall sentiment: positive **Pros** - 👍 Free and ad-free calculator app - 🎨 Multiple customizable themes and color schemes - 📜 Running tape/history feature to review calculations - 🔢 Fraction, decimal, and mixed number support - ⚡ Fast and efficient performance - 🧮 Easy-to-use interface with large buttons - 🎯 Great for students (GCSE, A-levels, algebra, geometry) - 📱 Works well in split-screen mode - 🌙 Dark theme with high contrast options - 🔧 Scientific calculator capabilities **Cons** - 🐛 Display rendering issues with character visibility - 🐛 App freezing and crashing problems - 📱 Landscape mode not working on iPhone - 🔌 Limited button size for users with larger fingers - 📢 Intrusive ad banner at top of screen - ⚠️ Fraction buttons not functioning properly - ❌ Missing memory function - 🔄 Inconsistent behavior across iOS updates - 🎨 Non-conventional design styles can be distracting - ⏱️ Lacks tutorial for new users **Commonly reported bugs** - Display characters not rendering correctly (about 1/4 of characters missing) - Fraction buttons not working as intended - iPhone landscape mode does not rotate or display split view - App freezes during use - Character display issues with numbers 0-9 appearing incomplete - Compatibility issues with latest iOS updates - Fraction input only accepts single digits before conversion **Most requested features** - Widget support for home screen - Scientific calculator functions (sin, cos, tan, square root, squaring) - Original version 1.0 color scheme option - Running tape format in newer versions - Screen rotation lock for landscape mode - Memory function for calculations - More conventional calculator design option - Tutorial or onboarding guide - Support for iPhone Max devices ## Newest reviews (17 of 81) ### 5/5 — No adds and No annoying links *2022-07-09, version 2.1.1* Best calculator I have been using so far. ### 5/5 — Amazing *2022-02-09, version 2.0.1* Great colors, great formatting, amazing options ### 5/5 — No need for my scientific calculator *2022-02-06, version 2.0.1* Love this app, as a professional engineer I don’t need to lug my scientific calculator around. Thank you! ### 5/5 — HI MR ERICKSEN *2022-01-26, version 2.0* I heard about this app and I wanted to use a new type of calculator on my phone that isn’t the Apple one. That’s when I heard from peers that Mr. Ericksen has a calculator app. Then I got it and woo I love it. ### 5/5 — Amazing *2022-01-12, version 2.0* Easy to use and very comprehensive with functions. ### 4/5 — Yay. 2.0! *2022-01-12, version 2.0* Hi John, great to finally see this update. One question and suggestion. The original formate in a dark back ground with bright colors as the text, could you please offer that as well? Also, I am unable to get my simple additions to layout in a running tape format like they did in your original version. Could you either tell me what I need to do to get that running tape format or along with the original color scheme of Version 1.0 I asked for could you please offer that as well. Again, so happy to see Version 2.0!! Thank you!!! **Developer response:** Hi TunaTunes, Thank you for taking the time to write a review and give suggestions, it's greatly appreciated! If you tap on the j (in a circle on the top right of the screen), the 2nd and 4th theme choices have dark backgrounds with bright colors. As for the running total, after you press "=" during a calculation, you can press "+", "–", "x" etc. and it will carry your current answer over to your next calculation. Thank you again for your review and suggestions, you may also email me at jcalc.calculator@gmail.com. All the best and happy calculating :) ### 5/5 — Amazing! *2021-12-31, version 2.0* Great new update! Works amazing on split screen and very easy to use! ### 5/5 — Great Update *2021-12-29, version 2.0* Excited about the new update and the scientific calculator. This calculator is great for working with measurements that require fractions. It’s my go to when I’m doing any wood working or using a tape measure. ### 5/5 — 😢 *2021-08-05, version 1.0* Max, come back. I miss your app. Please update. ### 5/5 — Problème *2020-10-19, version 1.0* A chaque fois que je démarre l’application les chiffres de 0 a 9 ne sa fiche pas comme il faut exemples 7 n’a que la pointe ### 5/5 — Outstanding! *2020-02-23, version 1.0* Easy to Use! Works Great! Many Themes! ### 5/5 — Shaun *2019-03-31, version 1.0* The Contrast is Awesome 👍👍 I Like the Black Background and Colorful numbering & Symbols also the Big Buttons...... Thank You 👍 ### 5/5 — 🤬🤬 *2018-12-04, version 1.0* THIS MOTHER TRUCKER KEEPS FREEZING ON ME. THIS IS MY LEAST FAVORITE APP THAT I EVER PURCHASED!! but I’ll still give it 5 stars cause I’m a good person. ### 5/5 — Wow *2018-11-12, version 1.0* It’s an awesome app it’s very useful when you don’t understand this ### 5/5 — Please Update :( *2018-10-09, version 1.0* App is bright and colorful and I’ve enjoyed using it for my numbers. Please update for iPhone Max :( ### 5/5 — 5 Star calculator *2018-09-20, version 1.0* Easy to use and the log view is great, Have not used my I phone calculator since. Thanks again! ### 5/5 — Easy to navigate *2018-05-31, version 1.0* This app is easy to use, has large keys and one is able to scroll back to see if and where mistakes were made in calculating. Simple is better!! ## Most critical reviews (10 lowest-rated) ### 1/5 — Display No Longer Works *2020-10-30, version 1.0* Loved this app until the latest iOS update. When you open the app, the display is not working correctly. About 1/4 of all characters on the page are displayed. If you tap them one by one, they display correctly. ### 1/5 — Serious bug in the iPhone version *2018-04-17, version 1.0* The concept is good and the iPad version is fine but the iPhone version landscape mode does not work at all. The calculator pad does not rotate and the split view that is supposed to show the calculations does not appear. ### 1/5 — Review *2015-04-13, version 1.0* Honestly, cool colors. Honestly, when I opened the app for the first time, I stared at the mass of numbers and words. There is no tutorial whatsoever, and when I tried to type the fraction 4/3 it only let me type the 4 and converted it to .25. Although A+ on the colors. ### 1/5 — Don't buy *2015-04-08, version 1.0* This piece of crap does not work at all you can't even use fractions which you know if your trying to find a calculator that uses fractions then you probably want one that actually uses fractions ### 3/5 — touches trop petite *2024-09-22, version 2.2* les touches sont trop petit pour les grands doigts ### 3/5 — Banner *2023-10-29, version 2.1.1* This is a large ad banner at the top, otherwise it seems to do the job. Not a fan of the different style proposed, there should be a least one looking more conventional, less distracting. And why is there no Memory function? ### 3/5 — Good app *2015-05-18, version 1.0* I think that this app was very useful although I would have liked to see some other tools. I wish that they would have had tools such as sin, cosin, and tangent. Also it good have used a squaring tool and a square root. ### 3/5 — Pretty Good Calculator *2015-05-14, version 1.0* jCalc is a pretty standard calculator. It works well and I like hat is is colorful and you can change the theme. Also the i button is very informative for those who aren't sure they are correctly using a calculator. However, the fraction, decimal, and percentage buttons don't work, so that should be fixed. Overall, it is a pretty good calculator app. ### 3/5 — It was okay *2015-05-08, version 1.0* It's like a normal calculator. It's helped but I just didn't like that fact that it doesn't have all the signs and buttons I need ### 3/5 — Jcalccc *2015-04-30, version 1.0* This app is a very good application to use. There are many options on it. It's hard to use at first but as I used it every day it got easier. I'll be using it in my math class often. I recommend it for everyone. ## Most praised reviews (10 highest-rated) ### 5/5 — Free *2026-05-04, version 2.3* Actual free calc app. Good for gcse a levels ### 5/5 — Calculadora *2026-02-25, version 2.3* Excelente Calculadora ### 5/5 — Very nice app + Suggestion *2025-11-02, version 2.3* I reallly like the app. It has cool designs and everything about it is very nice. It would be cool if I had a widget since I enjoy this more than the Apple calculator and would like a widget to replace the Apple one. (This is a student from 4th period AP precalc this year) ### 5/5 — Every good *2025-05-28, version 2.3* Very good ### 5/5 — Really good calculator, even better teacher *2024-10-11, version 2.2* Has everything i need to pass my algebra 2 class. Thanks Mr. Ericksen! ### 5/5 — YOU SHOULD DOWNLOAD *2024-10-10, version 2.2* Very good for my school and it helped all of my friends and I ### 5/5 — Best calculator *2024-01-24, version 2.2* Best calculator for all math problems. Creator seems to be a good app developer. ### 5/5 — Great, easy to use *2024-01-19, version 2.2* Love the dark theme and easy to read interface. ### 5/5 — Amazing and powerful calculator app! *2023-09-09, version 2.1.1* Love the different options for outputs and the variety of themes! Has a very nice interface and is very easy to use. Definitely the best calculator app I have ever installed. ### 5/5 — Calculator *2023-08-26, version 2.1.1* Excellent! --- *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 2026-08-13.*