# Scientific Calculator Plus 991 — user reviews > 498 indexed App Store user reviews of Scientific Calculator Plus 991 by Tran Duy, rated 4.70/5 from 12,288 ratings. - Source: https://appshunter.io/ios/app/scientific-calculator-plus-991/id1449106995/reviews - App overview in markdown: https://appshunter.io/ios/app/scientific-calculator-plus-991/id1449106995.md - Rating breakdown: 5★ 10,369 · 4★ 942 · 3★ 321 · 2★ 178 · 1★ 478 ## What do users think of Scientific Calculator Plus 991? Overall sentiment: positive **Pros** - 👍 Intuitive and easy to use - 🚀 Powerful and feature-rich - 💡 Customizable interface and settings - 🔍 Extensive library of formulas and equations - ⚙️ Handles complex math and scientific functions well - 🧠 Helpful for STEM students and professionals **Cons** - 🐛 Occasional bugs and input issues - 🔀 Confusing layout and button placement - 💰 Some advanced features locked behind paywall **Commonly reported bugs** - Keyboard input stops working after switching screens - Incorrect calculation results for certain operations - App crashes on some devices after recent update **Most requested features** - Add option to change display font and color - Improve cursor control and editing capabilities - Implement auto-simplification for complex expressions - Add more handwriting font options - Expand graphing and equation solving features ## Newest reviews (18 of 498) ### 4/5 — It’s good, but there needs to be a fix. *2026-08-09, version 3.6.1* The “*10^n” part beyond 10^10^20 needs to be inside the exponent, not outside. ### 4/5 — Good app but I wish there was dark mode icon *2026-08-06, version 3.6.1* I like this app, but I wish there was a dark mode icon ### 5/5 — Perfect *2026-06-23, version 3.5.8* With all the functions activated, this calculator is perfect Thx ✌️ ### 5/5 — Fantastic calculator *2026-06-23, version 3.5.7* I’m a retired mathematician and I’ve made “calculators” one of my retirement hobbies; physical calculators and calculator apps. I’ve examined and experimented with over 50 calculator apps on the iPhone, but I only keep two on my home page for my personal use. This is one of them. I’m really impressed with the capabilities of this calculator, and I’m still exploring what it can do. I highly recommend it for anyone doing STEM work. ### 5/5 — Reaching crazy numbers *2026-06-20, version 3.5.8* I can reach 10^10^500 and higher! ### 5/5 — Best scientific calculator app yet. Pleasing design. *2026-06-12, version 3.5.8* Aaa ### 5/5 — Great Calculator! *2026-06-08, version 3.5.7* This is my goto calculator for everything. So far it’s handled everything I’ve thrown at it. You won’t regret getting this one at all. ### 5/5 — Very useful tool *2026-06-07, version 3.5.8* Basically the same as the physical Casio calculator! ### 5/5 — This app *2026-06-01, version 3.5.8* Very accurate similar to regular scientific calc ### 5/5 — Tertration added! *2026-05-29, version 3.5.8* This calculator can calculate EXTREMELY LARGE NUMBERS! 10^^10/10 ### 5/5 — This limit is infinity *2026-05-28, version 3.5.8* The calc i needed ### 5/5 — Very good! So good *2026-05-23, version 3.5.8* SO NICE I GOT THIS! I love it!!! ### 5/5 — Best scientific calculator *2026-05-19, version 3.5.8* Best scientific calculator out there for iphone, iPads and Macs in general. I have paid for the ad free version and I use this calculator everywhere. ### 5/5 — Great app *2026-05-19, version 3.5.8* Been using it for years while doing my engineering degree, been so useful and it works just as well as the expensive calculators you can buy 100% recommend ### 5/5 — haaaaaa *2026-05-01, version 3.5.7* this calculator is the best! ### 5/5 — It can do everything *2026-04-30, version 3.5.7* yeah basically the title it’s like desmos there’s lots of functions there’s a few apps (or modes) as well there’s also built in reference which is really nice ### 5/5 — Great for Engineers and CS *2026-04-28, version 3.5.7* This Calc literallly has everything! It works great for all my EE stuff. (It even has CAS) The only small thing I would ask to add is the abillity to change the app icon on the Mac version like you can on the Ipad version. Outstanding app! ### 5/5 — Very Good! *2026-04-23* Very Good! **Developer response:** Thanks for using our app and taking the time to share with us! We're so happy you had a positive experience. Keep enjoying it, and feel free to share it with friends if you find it useful. ## Most critical reviews (10 lowest-rated) ### 1/5 — ads *2026-07-14, version 3.6.1* i’m seeing half naked girls as ads like wtf ### 1/5 — great concept *2026-05-04, version 3.5.7* I'm so over hitting pay walls on things. and making accounts. needing a formula, then 'nope cant do it as i need pro' so for a butcher and independant researcher who cant afford any type of luxuries like that its really hard. and when i can just get my real calculator from the draw. kind of silly in my eyes. hard to justify a ongoing revolving payment for this type of thing.... 1 off payment would be just barable. ### 1/5 — Chim to không sợ điểm kém *2025-10-20, version 2.2.2* Wow ### 1/5 — Ask to track? *2025-08-21, version 2.2.2* Why a paid calculator wants to ask permission to track across apps? ### 1/5 — Calculator *2025-03-18, version 2.2.2* Calculaters ### 1/5 — Really bad *2025-02-25, version 2.2.2* I kept putting in the SAME calculation and it kept coming out with a different number to all my friends Casio calculators. Made me lose marks on my exam for incorrect calculations. Not happy ### 1/5 — wierd background noise *2025-02-06, version 2.2.2* App is making irritating background noise while on ### 1/5 — Freaking begs *2024-12-18, version 2.2.2* Good app (5 stars) but… IT BEGS FOR A 5 STAR REVEIW ### 1/5 — App máy tính *2024-11-28, version 2.2.2* Như cạk ### 1/5 — Always pause my music *2024-11-25, version 2.2.2* Is it just me or anytime I’m listening to music and I open this stupid app it pauses my music? I play the music back and it still pauses my music again I can’t listen to music and use the calculator at the same time unless I pay for premium ? ## Most praised reviews (10 highest-rated) ### 5/5 — It helped me so much with my English assignment!! So good! *2026-08-10, version 3.6.1* So basically I had a task to write a story about a bear, and I wanted to write about Winnie the Pooh. I planned this splendid story about how Winnie needed honey and then asked Piglet for some. It the thing was, I did not know how to spell delishous! Well, I downloaded this calculator and it helped me spell it, and even gave me tips on how to improve my story! Thanks to it, I now know that delishous is spelled with an sh and not a c, like I previously though. This app is super ⭐️⭐️⭐️⭐️⭐️ ### 5/5 — Brilliant Scientific Calculator *2026-07-26, version 3.6.1* Fantastic tool for study and everyday practice. Still exploring its numerous modules (or features). ### 5/5 — Like it! *2026-07-23, version 3.6.1* It has awesome features! ### 5/5 — calc *2026-07-20, version 3.6.1* good ### 5/5 — Very helpful app *2026-07-17, version 3.6.1* I’ve been using this calculator app for a while now, and it has been really helpful. It’s fast, simple, and does exactly what I need without any hassle. Definitely deserves 5 stars! ### 5/5 — Best *2026-07-13, version 3.6.1* Best digital calculator with maths photo solution ### 5/5 — Great *2026-07-08, version 3.6.1* Works great ### 5/5 — Best calculator app there is *2026-07-06, version 3.6.1* Extremely happy with my purchase no monthly subscription, boasts way more features than I was expecting, love love love. ### 5/5 — Peak *2026-07-03, version 3.6.1* I have never ever found such a peak app than this🫡🔥no capping, I’m using free edition and its already great. I don’t have much money so I just write this review to support the developer✍️🔥🔥. ### 5/5 — Awesome!!! *2026-06-27, version 3.6.1* I changed my HP 48GX for that. --- *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 2026-09-02.*