# Touch RPN calc vs E2E

The clearest difference is in-app purchases: E2E at none against Touch RPN calc's 10. E2E also leads on iOS requirement (11.0 vs 15.0). Touch RPN calc's advantage is device support. On price there is nothing between them.

Both are free to download. Touch RPN calc sells 10 one-off in-app purchases. E2E asks for nothing beyond the download.

## The numbers

| Metric | Touch RPN calc | E2E |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.4 (208 ratings)](https://appshunter.io/ios/app/touch-rpn-calc/id946171077/reviews)** | — |
| Number of ratings | **208** | — |
| Positive reviews | 47.9% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | — |
| Update frequency | Every 2 months | — |
| Monetization | Free with in-app purchases | — |
| Size | 30 MB | 30 MB |
| Requires iOS | 15.0 | **11.0** |
| Devices | **iPhone, iPad, iPod** | — |
| Age rating | +4 | 17+ |
| Developer | [Elvis Pfutzenreuter](https://appshunter.io/developer/463497848) | [e2eworks corp](https://appshunter.io/developer/1299161055) |

## 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


### E2E

[App page](https://appshunter.io/ios/app/e2e-authenticator/id1465653047)

**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 E2E free?

E2E is free to download, with no in-app purchases.

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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.*