# RLM-15CX — user reviews > 15 indexed App Store user reviews of RLM by R.L.M. Software, rated 4.10/5 from 17 ratings. - Source: https://appshunter.io/ios/app/rlm-15cx/id1636646608/reviews - App overview in markdown: https://appshunter.io/ios/app/rlm-15cx/id1636646608.md - Rating breakdown: 5★ 11 · 4★ 1 · 3★ 2 · 2★ 1 · 1★ 2 ## Most critical reviews (10 lowest-rated) ### 1/5 — Bait and switch! *2025-08-25* No price down in App Store, but upon install, immediately demand $9.99. NOPE ### 3/5 — Great for the trial *2026-08-14* I can’t purchase this app. I tried several passwords but can’t get the purchase to work. What a shame. This is a great app otherwise. ### 3/5 — Latest update disabled. *2024-03-08* Great app, but cannot restore purchase with today’s update. **Developer response:** We are very sorry for that, but be sure you are using the same Apple ID used in your first purchase. If it is ok, please refer to Apple's customer support. They completely control the installation, payments and restoring. ### 4/5 — HP15C_user *2026-02-19* The pressure conversion in this calculator uses seawater. For example, 20 psi is converted to 45.2412 feet of sea water. Using sea water is not common, and the calculator does not provide feet of standard water for a conversion unit. The conventional conversion is 20 psi is 46.1358 feet of standard water. ### 4/5 — Great app *2024-05-05* Obviously a work of love from someone who cares. I used an hp15c for most of my working life and this app is a faithful recreation of that experience. I do find that there is an intermittent lag time between button presses and data entry. Otherwise, this is perfect. **Developer response:** Do this intermitent lag still occurs ?, please contact us to support@rlmtools.com to have more information about. ### 5/5 — Excellent *2026-05-22* This is my favorite calculator.. exactly like Hp 15 c Also I recommend all Rlm Calculators….The best by far ! ### 5/5 — RPN-15c *2026-02-06* Since 1983 I use first HP11c then HP15c. The RLM is a real improvement especially as a programming aid. ### 5/5 — Amazing & Impressive!! *2025-06-02* clearly, a work of love! So much attention to detail, not only to the functionality, but also to the visual looks.. the UI is super impressive! It really looks like a HP calculator! 🥰 kudos to your amazing and very impressive work! ### 5/5 — Amazing & Impressive!! *2025-05-29* clearly, a work of love! So much attention to detail, not only for the functionality, but also for the visual looks.. the UI is super impressive! It really looks like a HP calculator! 🥰 kudos to your amazing and very impressive work! ### 5/5 — Great app *2024-05-15* Obviously a work of love from someone who cares. I used an hp15c for most of my working life and this app is a faithful recreation of that experience. With this revision the intermittent lag is gone. Thanks to the developer for quickly responding. I give the app five stars now. **Developer response:** Do this intermitent lag still occurs ?, please contact us to support@rlmtools.com to have more information about. ## Most praised reviews (5 highest-rated) ### 5/5 — “Clear” “REG” doesn’t clear the registers *2023-09-04* Great for money, except “Clear” “REG” doesn’t clear the registers. This is a bug that needs fixed ASAP. **Developer response:** This bug was fixed in the latest update. Please update to it (version 2.1.7). ### 5/5 — Sehr guter Rechner *2023-06-28* Sehr guter Rechner mit vielen nützlichen Funktionen. Die Darstellung auf dem iPhone ist jedoch sehr schlecht. Tasten und Zwischenräume bzw Hintergrund sind übereinander dargestellt! Auf einem IPad ist die Darstellung ok. **Developer response:** Probably you have the "Button Shapes" set to ON in "Display & Text Size" option of the "Accessibility" item in the device's Settings. ### 5/5 — app no ​​longer launches *2023-06-23* app no ​​longer launches **Developer response:** This is odd. Please delete de app from your device and install the latest version again. ### 5/5 — very good if you change one thing *2022-11-27* I like this app very much. Only the timing of the haptic feedback don't work for me. I need a feedbach we I press a key. The app wait until I lift up the finger. ### 5/5 — All better now *2022-10-19* With my settings fixed, this is now my go-to calculator on my phone. It is a bit pricey, but so was my 15C. **Developer response:** It seems that you have set to ON the “Button Shapes” option in the “Display & Text Size” of the “Accessibility” settings. So, open the device Settings, scroll down to the “Accessibility” item and touch it. Then, touch the “Display & Text Size” item and turn OFF the “Button Shapes” switch. --- *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 2026-09-10.*