Touch RPN calc vs PREVI
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Touch RPN calc
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.
- RPN financial calculator
- RPN scientific calculator
- Programming functions
- HP-12C emulation
- HP-11C emulation
- Expandable calculator flavors
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Touch RPN is an RPN financial and scientific calculator that implements most features of the industry-standard HP-12C, including programming functions. It also implements a scientific RPN flavor that implements most functions of the beloved 11C. And even more flavors (10C-like, 16C-like) can be purchased within the app.
PREVI
Access information about your pension plan and manage your account on the go. This app provides news and self-service options for participants of Plano 1 and Previ Futuro. Log in with your existing website credentials.
- Pension plan information
- News updates
- Self-service options
- Account management
- Secure login
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App para os participantes do Plano 1 e Previ Futuro. É a Previ na palma de sua mão. Aqui você encontra informações sobre seu Plano, notícias e serviços de Autoatendimento. Para acessar, basta usar mesma senha do site Previ. Seja bem-vindo!
Screenshots
Verdict
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 (210 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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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 210 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 1, 2026 and November 2, 2026 respectively.
| Parameter | Touch RPN calc | PREVI |
|---|---|---|
| Price | Free | Free |
| Rating | 3.4 (210 ratings) — better | 2.5 (4 ratings) |
| Positive reviews | 48.1% of reviews — better | 7.7% of reviews |
| Number of ratings | 210 — better | 4 |
| Update frequency | Every 2 months | Every 10 days — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 15.0 |
| Further details — not scored | ||
| Size | 30 MB | 121 MB |
| Age rating | 4+ | 4+ |
| Developer | Elvis Pfutzenreuter | Caixa de Previdência dos Funcionários do Banco do Brasil |
Customer experience
Touch RPN calc
PREVI
Bugs and requests
Touch RPN calc
Reported bugs
3 issues- Stopped working after iOS upgrade
- Landscape mode not functioning properly
- Ads appearing in paid version
Requested features
3 requests- Paste feature
- Option to switch between RPN and algebraic modes
- Ability to see stack contents instead of ads in paid version
PREVI
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Touch RPN calc
- Scientific Basic$2.99
- Scientific Premium$3.99
- Computer programmer$3.99
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- Scientific Advanced$4.99
- Financial Black-Scholes$4.99
- Financial Premium$6.99
- Financial Advanced$6.99
PREVI
No in-app purchases
