# Scientific Calculator fx-991 — user reviews > 68 indexed App Store user reviews of Scientific Calculator fx by Dinh Phuc, rated 4.50/5 from 391 ratings. - Source: https://appshunter.io/ios/app/scientific-calculator-fx-991/id1673640297/reviews - App overview in markdown: https://appshunter.io/ios/app/scientific-calculator-fx-991/id1673640297.md - Rating breakdown: 5★ 308 · 4★ 40 · 3★ 11 · 2★ 9 · 1★ 23 ## Newest reviews (18 of 68) ### 4/5 — Reseña de Marcus *2026-06-08, version 1.8.8* Es la aplicación más curada y útil me llamo marcushh el ora aya tata ### 5/5 — Very good!! *2026-05-09, version 1.8.3* I recently downloaded as I lost my calculator and it’s been very enjoyable to use no annoying adds and exactly like a real calculator👍👍 ### 5/5 — Fx-350 레이아웃에서 *2026-05-07* 동일한 log키가 중복 입니다 수정배포 부탁드립니다 **Developer response:** 정말 멋집니다! 별 5개 리뷰 감사합니다! 💖 앱에 만족하셨다니 정말 기쁩니다. 더 나은 앱을 만들기 위한 의견이 있으시면 언제든지 알려주세요! 😊 ### 5/5 — 좋습니다 *2026-05-06* 유용하게 사용하고 있습니다 **Developer response:** 별 5개 평점을 주셔서 정말 감사합니다! 🌟 여러분의 응원은 저희가 앱을 계속 개발하고 개선하는 데 큰 동기가 됩니다. HiEdu와 함께 즐거운 시간을 보내시길 바랍니다! 🚀 ### 5/5 — Useful and free *2026-05-04, version 1.8.2* I got this just to be a calculator and it does more than that. I’ve used this so much during my GCSE’s and found it has been really helpful when I don’t have a calculator on hand ### 5/5 — very very useful *2026-04-29, version 1.8.2* really satisfying to use ### 5/5 — Très pratique *2026-04-23, version 1.8.1* Tout comme une vraie calculatrice! ### 5/5 — Merci *2026-04-23, version 1.8.1* Merci de l’avoir créé cela nous facilite et très très utile ### 5/5 — 좋아요 *2026-03-25* 카시오랑 비슷한 인터페이스라 좋고 분수도 입력되는게 편합니다. 제가 찾던 앱이네요 감사합니다. 🫡 **Developer response:** Неверојатно! Ви благодариме за оценката од 5 ѕвездички! 💖 Многу ни е мило што знаеме дека сте задоволни од апликацијата. Доколку имате какви било предлози за да ја направите уште подобра, слободно споделете ги! 😊 ### 5/5 — Top *2026-03-24* Je conseille elle est vraiment bien quand t’a pas ta calculatrice à côté de toi et même si tu la à côté 😂😂 **Developer response:** Merci beaucoup pour votre note de 5 étoiles ! 🌟 Votre soutien est une grande source de motivation pour nous encourager à continuer de développer et d'améliorer l'application. Nous vous souhaitons une excellente expérience avec HiEdu ! 🚀 ### 5/5 — big ah dihh *2026-02-26, version 1.7.7* super big dihh ### 5/5 — تطبيق ممتاز *2026-02-25, version 1.7.7* راجع جدا 👌🏻 ### 5/5 — Best of Best *2026-02-16* Best calculator I’ve ever seen **Developer response:** Amazing! Thank you for the 5-star review! 💖 We are so happy to know that you are satisfied with the app. If you have any suggestions to make it even better, feel free to share! 😊 ### 5/5 — 잘 쓰고 있어요 *2026-02-03* 그런데 업데이트 이후로 i 키가 안눌리는거 같아요.. (허수 부분) 참고해주세요! **Developer response:** 별 5개 평점을 주셔서 정말 감사합니다! 🌟 여러분의 응원은 저희가 앱을 계속 개발하고 개선하는 데 큰 동기부여가 됩니다. HiEdu와 함께 멋진 경험을 하시길 바랍니다! 🚀 ### 5/5 — the app is amazing *2026-01-30, version 1.7.7* great app it saved me so much😭😭💞💞 ### 5/5 — A life saver *2026-01-27, version 1.7.7* I can’t believe how accurate this is to the real thing, AND how easy it is to use 👏 ### 5/5 — Super *2026-01-18* Elle est super bien ça m’a remplacer ma vrais calculatrice 👍 ### 5/5 — Love the Calc *2026-01-06, version 1.7.6* I have had a great time using this calculator for school and it has helped me in so many ways ## Most critical reviews (10 lowest-rated) ### 1/5 — Challenge your mind error *2026-07-07, version 1.8.8* There is a mistake in The #43 in the challenge your mind section. The answer can't be 6. It is in fact 8. ### 1/5 — Not good *2025-10-29* Completely not good, really bad experience, i want to say worst stuff but i want my review to stay. I wouldn’t even recommend it to someone i hate. **Developer response:** Oh... You really surprised me, Can you tell us more details about your experience???? ### 1/5 — bad *2025-10-06, version 1.7.1* keeps crashing ### 1/5 — Crashes on ios26 *2025-10-05* Crashing on the loading screen. Couldn’t get it to work ### 1/5 — Never made it past the tutorial *2025-10-03, version 1.7.1* Got to a screen and the app and clicked the next button and the app immediately shut down. I tried it many times and even uninstalled and reinstalled. The problem persisted. ### 1/5 — Doesn’t work *2025-10-02, version 1.7.1* I was trying to use it for my school homework and when I try to open the app, it closes it as soon as I open the app, it’s annoying, I guess it’s only me but idk ### 1/5 — Why it was working just fine and now with the update it closes? *2024-05-24, version 1.2.1* The app was perfect until the last update, now it closes once you open it. Please fix that because it a tool that many of us use a lot ### 2/5 — Can’t upgrade to paid version. *2024-11-21, version 1.4.8* The page never loads, app gets stuck and you are forced to force-stopl it to use it again. ### 3/5 — Removed features *2026-05-05, version 1.8.3* Initially, I loved using this app. Everything was interfaced like a real calculator. However, in a recent update they simplified the interface, and now I cannot find any important buttons like pi. Either they are hidden somewhere else or I don’t know how to use the app but it was very annoying. ### 3/5 — Can’t change keyboard *2025-05-21, version 1.6.3* I cannot see how to change the keyboard layout. It should be an option on the menu. There is no 3-dot menu. ## Most praised reviews (10 highest-rated) ### 5/5 — Very useful and no problems with this app 🙂 *2026-08-19, version 1.8.9* I can’t think of any bad things about this app and I also love how it has imaginary numbers like i ### 5/5 — I love this, good stuff ☝️🤓 *2026-06-12, version 1.8.8* I love this, good stuff ☝️🤓 ### 5/5 — Really awesome *2026-06-10, version 1.8.8* Super easy to use and free!! ### 5/5 — Rev *2026-06-03, version 1.8.8* Quite fast and easy to use ### 5/5 — 공학용계산 잘 됨 *2026-05-25* 복소수 계산 주로 사용중 **Developer response:** 별 5개 평점을 주셔서 정말 감사합니다! 🌟 여러분의 응원은 저희가 앱을 계속 개발하고 개선하는 데 큰 동기가 됩니다. HiEdu와 함께 즐거운 시간을 보내시길 바랍니다! 🚀 ### 5/5 — Good app *2026-05-24, version 1.8.8* Very very very helpful exactly like my physical Casio and so helpful ### 5/5 — Amazing *2026-05-21, version 1.8.5* Forgot my actual calculator for Math class today luckily was able to use this and it was faster than my normal calculator an extremely helpful loved it ### 5/5 — 너무 좋네요 *2026-05-20* 완벽합니다 **Developer response:** 별 5개 평점을 주셔서 정말 감사합니다! 🌟 여러분의 응원은 저희가 앱을 계속 개발하고 개선하는 데 큰 동기가 됩니다. HiEdu와 함께 즐거운 시간을 보내시길 바랍니다! 🚀 ### 5/5 — 정말 좋은 계산기 *2026-05-19* 카시오 fx-fx570es plus & fx-570cw 두종류를 사용하고 있어 비슷한 디자인과 기능이라 정말 편리합니다. **Developer response:** 정말 멋집니다! 별 5개 리뷰 감사합니다! 💖 앱에 만족하셨다니 정말 기쁩니다. 더 나은 앱을 만들기 위한 의견이 있으시면 언제든지 알려주세요! 😊 ### 5/5 — 🫶 *2026-05-19* 🥰 **Developer response:** Thank you so much for your 5-star rating! 🌟 Your support is a great motivation for us to continue developing and improving the app. We wish you a fantastic experience with HiEdu! 🚀 --- *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 2026-09-03.*