# STACK999 — user reviews

> 3 indexed App Store user reviews of STACK999 by Manabu Fukui, rated 4.00/5 from 1 ratings.

- Source: https://appshunter.io/ios/app/stack999/id382001084/reviews
- App overview in markdown: https://appshunter.io/ios/app/stack999/id382001084.md
- Rating breakdown: 5★ 0 · 4★ 1 · 3★ 0 · 2★ 0 · 1★ 0

## Most critical reviews (3 lowest-rated)

### 5/5 — Perfect app!

*2017-01-08, version 2.0.1*

This app is great! I wanted an RPN calculator that looked nice, and was free, and this was it! Has all the needed functions, a nice long stack, and is elegant and utilitarian. Perfect. I would have loved a way to paste in numbers, but I might just be missing how you're supposed to do that. And maybe a few more esoteric functions for fun, but over all this is the only good RPN calculator I've ever found for iOS.

### 5/5 — Simple but great

*2011-10-30, version 0.1*

This is the best of the free rpn calculators I have found. I actually like the while minimal gui. Plus is has all the trig, log, and power functions you really need. Great app!
Thank you for providing a fully functional rpn calculator for free!

### 5/5 — Great little app

*2011-03-27, version 0.1*

I use an hp32 - but this little app for my iPod touch is very cool and very handy

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*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 2026-06-10.*