# Touch RPN calc vs PREVI

The clearest difference is rating: Touch RPN calc at 3.4 against PREVI's 2.5. Touch RPN calc also leads on review sentiment (48% vs 8%) and ratings volume (212 vs 4). PREVI's advantage is in-app purchases (none vs 7) and ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Touch RPN calc sells 7 one-off in-app purchases. PREVI asks for nothing beyond the download.

Touch RPN calc holds the better App Store score, 3.4 against 2.5. That said, the two scores are not equally well evidenced: Touch RPN calc has 212 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 48% of Touch RPN calc's written reviews are positive against 8% of PREVI's.

Touch RPN calc ships an update every 2 months, PREVI every 10 days. The most recent releases landed on November 11, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | Touch RPN calc | PREVI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.4 (212 ratings)](https://appshunter.io/ios/app/touch-rpn-calc/id946171077/reviews)** | [2.5 (4 ratings)](https://appshunter.io/ios/app/previ/id1196343450/reviews) |
| Number of ratings | **212** | 4 |
| Positive reviews | **48.1% of reviews** | 7.7% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | **Every 10 days** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 30 MB | 122 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Elvis Pfutzenreuter](https://appshunter.io/developer/463497848) | [Caixa de Previdência dos Funcionários do Banco do Brasil](https://appshunter.io/developer/1196343449) |

## 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 (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 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


### PREVI

[App page](https://appshunter.io/ios/app/previ/id1196343450)

Access your Plano 1 and Previ Futuro plan information, news, and self-service features. Manage your pension plan conveniently from your mobile device using your existing website credentials.

**Highlights:** Access Plano 1 and Previ Futuro information, View plan details, Read news updates, Utilize self-service features, Secure login with website credentials

**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 PREVI free?

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

### Which has better reviews, Touch RPN calc or PREVI?

Touch RPN calc is rated higher. Touch RPN calc averages 3.4 out of 5 from 212 ratings, while PREVI averages 2.5 from 4 ratings.

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

Touch RPN calc shows ads; PREVI does not.

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

Touch RPN calc ships an update every 2 months, and PREVI every 10 days. Most recently, Touch RPN calc was updated on November 11, 2026 and PREVI on November 6, 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.*