# ThetaCalc — user reviews

> 3 indexed App Store user reviews of ThetaCalc by Felix Stehli, rated 4.25/5 from 4 ratings.

- Source: https://appshunter.io/ios/app/thetacalc/id1521614636/reviews
- App overview in markdown: https://appshunter.io/ios/app/thetacalc/id1521614636.md
- Rating breakdown: 5★ 2 · 4★ 1 · 3★ 1 · 2★ 0 · 1★ 0

## Most critical reviews (3 lowest-rated)

### 5/5 — Like HP42 or DM42 with Javascript

*2022-08-08*

This calculator is an RPN calculator like the HP42S or DM42 but instead of RPL it uses Javascript for its programming model. This is seriously amazing! I have a bunch of other RPN calculators for iOS and this one blows them all out of the water in every way.

### 5/5 — Wow

*2022-03-15*

Didn’t take long to figure out, seems to go ok, like the JavaScript code feature +  clear examples. A very tuneable calculator (3,2,1++=) rpn. Luv it. Luv it.

### 5/5 — Well thought out JavaScript extensible RPN calculator

*2020-12-09*

There’s no end to what you can do with this calculator!

If you need a calculator to do something unique, you can probably get it done with ThetaCalc.

I wanted to generate a specialized flightplan for an online flight simulator. No problem, ThetaCalc was up to the task. Then for maximum usability,  I needed to generate the output as an XML file. Once again, no problem.

It’s so sweet to have this programmability in the palm of your hand.

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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 2026-06-01.*