# Stackis RPN vs Panda Trans

The clearest difference is price: Stackis RPN at Free against Panda Trans's $4.99. Stackis RPN also leads on update cadence (every 4 days vs every 5 weeks). Panda Trans's advantage is in-app purchases (none vs 1). On review sentiment, ads, device support and iOS requirement there is nothing between them.

Stackis RPN is free to download; Panda Trans costs $4.99 up front. Stackis RPN sells 1 one-off in-app purchase. Panda Trans asks for nothing beyond the download.

Stackis RPN ships an update every 4 days, Panda Trans every 5 weeks. The most recent releases landed on September 26, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | Stackis RPN | Panda Trans |
| --- | --- | --- |
| Price | **Free** | $4.99 |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/stackis-rpn/id6752929114/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 5 weeks |
| Monetization | **Free** | Paid |
| Size | 10 MB | 10 MB |
| Requires iOS | **17.6** | 18.6 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Skimra](https://appshunter.io/developer/403502071) | [yu liu](https://appshunter.io/developer/1862057395) |

## 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 |


### Panda Trans

[App page](https://appshunter.io/ios/app/panda-trans-offline-languages/id6757993913)

Translate documents, photos, and voice recordings offline with advanced OCR and layout optimization. Offers secure, on-device processing for privacy and supports numerous global languages with authentic expression. Features a clean, content-focused interface.

**Highlights:** Offline PDF document translation with layout optimization, On-device voice recognition for secure transcription, Smart OCR photo translation from camera, Bilingual comparison mode for learning, Supports major global languages, Neo-Brutalism design for intuitive use

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

**In-app purchases:** none


## Frequently asked questions

### Is Stackis RPN free?

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

### Is Panda Trans free?

Panda Trans costs $4.99, with no in-app purchases.

### Do Stackis RPN or Panda Trans have ads?

Neither Stackis RPN nor Panda Trans shows ads.

### Which is updated more often, Stackis RPN or Panda Trans?

Stackis RPN ships an update every 4 days, and Panda Trans every 5 weeks. Most recently, Stackis RPN was updated on September 26, 2026 and Panda Trans on September 24, 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.*