# Stackis RPN vs LudyExif

The clearest difference is review sentiment: Stackis RPN at 100% against LudyExif's 0%. Stackis RPN also leads on rating (5.0 vs 3.5) and monetization model (free vs free with in-app purchases). On price, ratings volume, ads and in-app purchases there is nothing between them.

Both are free to download. Stackis RPN sells 1 one-off in-app purchase and LudyExif sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Stackis RPN holds the better App Store score, 5.0 against 3.5. Both are backed by a comparable volume of ratings — 2 and 2 respectively. Written reviews point the same way: 100% of Stackis RPN's written reviews are positive against 0% of LudyExif's.

Stackis RPN ships an update every 4 days, LudyExif weekly. The most recent releases landed on October 12, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | Stackis RPN | LudyExif |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/stackis-rpn/id6752929114/reviews)** | [3.5 (2 ratings)](https://appshunter.io/ios/app/ludyexif-exif-editor/id6760803251/reviews) |
| Number of ratings | 2 | 2 |
| Positive reviews | **100.0% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 4 days** | Weekly |
| Monetization | **Free** | Free with in-app purchases |
| Size | 10 MB | 11 MB |
| Requires iOS | 17.6 | **17.0** |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Skimra](https://appshunter.io/developer/403502071) | [Ludy Ankas, LLC](https://appshunter.io/developer/1839727404) |

## What reviewers say

### Stackis RPN

[App page](https://appshunter.io/ios/app/stackis-rpn/id6752929114)

A calculator designed for users who prefer Reverse Polish Notation (RPN). It offers a familiar interface for RPN users and includes support for duodecimal calculations.

**Highlights:** RPN calculation style, Duodecimal (dozenal) support, Familiar interface for RPN users, Simple and pleasant user experience

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Advanced Mode | $1.99 | one-time |


### LudyExif

[App page](https://appshunter.io/ios/app/ludyexif-exif-editor/id6760803251)

View and remove sensitive metadata from your photos, including GPS location and device details. Get a privacy risk score for each image and easily clean them before sharing.

**Highlights:** View EXIF metadata, Privacy Risk Score, Remove GPS coordinates, Edit IPTC fields, Batch processing, Map view for geotagged photos, Metadata templates

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| LudyExif Pro | $2.99 | one-time |


## Frequently asked questions

### Is Stackis RPN free?

Stackis RPN is free to download, with in-app purchases available.

### Is LudyExif free?

LudyExif is free to download, with in-app purchases available.

### Which has better reviews, Stackis RPN or LudyExif?

Stackis RPN is rated higher. Stackis RPN averages 5.0 out of 5 from 2 ratings, while LudyExif averages 3.5 from 2 ratings.

### Do Stackis RPN or LudyExif have ads?

Neither Stackis RPN nor LudyExif shows ads.

### Which is updated more often, Stackis RPN or LudyExif?

Stackis RPN ships an update every 4 days, and LudyExif weekly. Most recently, Stackis RPN was updated on October 12, 2026 and LudyExif on September 17, 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.*