# RPN Calc vs StarLoc

The clearest difference is review sentiment: StarLoc at 100% against RPN Calc's 38%. StarLoc also leads on price (Free vs $0.99) and rating (5.0 vs 4.0). RPN Calc's advantage is device support (3 vs 1). On ratings volume, update cadence, ads and in-app purchases there is nothing between them.

StarLoc is free to download; RPN Calc costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

StarLoc holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 6 and 3 respectively. Written reviews point the same way: 38% of RPN Calc's written reviews are positive against 100% of StarLoc's.

RPN Calc ships an update every 3 months, StarLoc every 2 months. The most recent releases landed on October 24, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | RPN Calc | StarLoc |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | [4.0 (6 ratings)](https://appshunter.io/ios/app/rpn-calc/id285002799/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/starloc/id6760946563/reviews)** |
| Number of ratings | **6** | 3 |
| Positive reviews | 37.9% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 months** |
| Monetization | **Free** | Paid |
| Size | 3 MB | 2 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | **iPhone, iPad, Apple Watch** | iPhone |
| Age rating | +4 | 4+ |
| Developer | [James Mattis](https://appshunter.io/developer/285002802) | [Daniel Schaich](https://appshunter.io/developer/1886958439) |

## What reviewers say

### RPN Calc

[App page](https://appshunter.io/ios/app/rpn-calc/id285002799)

This app provides a straightforward reverse Polish notation (RPN) calculator experience, inspired by classic HP models. It offers a clean interface with large buttons for quick calculations on iPhone, iPad, and Apple Watch, along with a convenient Today Extension for immediate access.

**Highlights:** Reverse Polish Notation (RPN) input, Clean, simple interface, Large, easy-to-press buttons, iPhone, iPad, and Apple Watch support, Today Extension for quick access

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


### StarLoc

[App page](https://appshunter.io/ios/app/starloc/id6760946563)

This app provides precise GPS coordinates, altitude, and time data in a night-friendly interface for astronomers. It offers essential information for telescope alignment and observation, with a focus on preserving night vision.

**Highlights:** Night-friendly dark theme, Accurate latitude and longitude (DMS), Decimal coordinate support, Real-time GPS updates, Local, UTC, and offset time, Elevation in meters and feet, Horizontal and vertical accuracy

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is RPN Calc free?

RPN Calc costs $0.99, with no in-app purchases.

### Is StarLoc free?

StarLoc is free to download, with no in-app purchases.

### Which has better reviews, RPN Calc or StarLoc?

StarLoc is rated higher. RPN Calc averages 4.0 out of 5 from 6 ratings, while StarLoc averages 5.0 from 3 ratings.

### Do RPN Calc or StarLoc have ads?

Neither RPN Calc nor StarLoc shows ads.

### Which is updated more often, RPN Calc or StarLoc?

RPN Calc ships an update every 3 months, and StarLoc every 2 months. Most recently, RPN Calc was updated on October 24, 2026 and StarLoc on October 31, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*