# Touch RPN calc vs Karppa

The clearest difference is review sentiment: Karppa at 100% against Touch RPN calc's 48%. Karppa also leads on in-app purchases (none vs 10) and ads (none vs shown). On price, monetization model, device support and iOS requirement there is nothing between them.

Both are free to download. Touch RPN calc sells 10 one-off in-app purchases. Karppa asks for nothing beyond the download.

Touch RPN calc ships an update every 2 months, Karppa every 3 days. The most recent releases landed on October 24, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Touch RPN calc | Karppa |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.4 (210 ratings)](https://appshunter.io/ios/app/touch-rpn-calc/id946171077/reviews)** | — |
| Number of ratings | **210** | — |
| Positive reviews | 48.1% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | **Every 3 days** |
| Monetization | Free with in-app purchases | Freemium |
| Size | 30 MB | 21 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | +4 |
| Developer | [Elvis Pfutzenreuter](https://appshunter.io/developer/463497848) | [Karppa Educacao ltda](https://appshunter.io/developer/1842186240) |

## What reviewers say

### Touch RPN calc

[App page](https://appshunter.io/ios/app/touch-rpn-calc/id946171077)

This app offers a powerful RPN calculator with financial and scientific functions, mimicking popular industry-standard models. It includes programming capabilities and expandable flavors for diverse calculation needs.

**Highlights:** RPN financial calculator, RPN scientific calculator, Programming functions, HP-12C emulation, HP-11C emulation, Expandable calculator flavors

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Touch 11i app transfer | Free | one-time |
| Touch Fin app transfer | Free | one-time |
| Touch 15i app transfer | Free | one-time |
| Scientific Basic | $2.99 | one-time |
| Scientific Premium | $3.99 | one-time |
| Computer programmer | $3.99 | one-time |
| Scientific Advanced | $4.99 | one-time |
| Financial Black-Scholes | $4.99 | one-time |
| Financial Premium | $6.99 | one-time |
| Financial Advanced | $6.99 | one-time |

**What reviewers like**

- 🚀 Excellent HP calculator emulation
- 👍 Looks and works like the real thing
- 👍 Portrait and landscape modes
- 👍 Paid version is ad-free
- 👍 Great RPN calculator

**What reviewers complain about**

- 🐛 Ads in free version
- 🐛 Ads appearing in paid version
- 🐛 Incorrect calculations
- 🐛 Landscape mode issues
- 🐛 Inability to clear memory

**Reported bugs**

- Stopped working after iOS upgrade
- Landscape mode not functioning properly
- Ads appearing in paid version

**Requested features**

- Paste feature
- Option to switch between RPN and algebraic modes
- Ability to see stack contents instead of ads in paid version


### Karppa

[App page](https://appshunter.io/ios/app/karppa/id6790468249)

This platform helps financial educators manage their clients' finances efficiently. It centralizes financial data, automates repetitive tasks, and provides tools for analysis and goal tracking. Clients gain free access to their own financial dashboard.

**Highlights:** Client financial data centralization, Lead funnel management, Consolidated financial statements, Automated risk alerts, Goal and target tracking, AI-powered transaction extraction, Financial simulation tools

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

**In-app purchases:** none


## Frequently asked questions

### Is Touch RPN calc free?

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

### Is Karppa free?

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

### Do Touch RPN calc or Karppa have ads?

Touch RPN calc shows ads; Karppa does not.

### Which is updated more often, Touch RPN calc or Karppa?

Touch RPN calc ships an update every 2 months, and Karppa every 3 days. Most recently, Touch RPN calc was updated on October 24, 2026 and Karppa on October 12, 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.*