# Sum Up vs RPN Deck

The clearest difference is in-app purchases: Sum Up at none against RPN Deck's 1. Sum Up also leads on iOS requirement (15.0 vs 18.0). RPN Deck's advantage is update cadence (every 11 days vs every 8 months). On price, ads and device support there is nothing between them.

Both are free to download. RPN Deck sells 1 one-off in-app purchase. Sum Up asks for nothing beyond the download.

Sum Up ships an update every 8 months, RPN Deck every 11 days. The most recent releases landed on October 7, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Sum Up | RPN Deck |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 11 days** |
| Size | 16 MB | 2 MB |
| Requires iOS | **15.0** | 18.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [佳伟 蔡](https://appshunter.io/developer/1801859662) | [Edgard Leo Berendsen Mercado](https://appshunter.io/developer/1893604343) |

## What reviewers say

### Sum Up

[App page](https://appshunter.io/ios/app/sum-up-quick-calculator/id6743669173)

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

**In-app purchases:** none


### RPN Deck

[App page](https://appshunter.io/ios/app/rpn-deck/id6796490842)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Deck | $2.99 | one-time |


## Frequently asked questions

### Is Sum Up free?

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

### Is RPN Deck free?

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

### Do Sum Up or RPN Deck have ads?

Neither Sum Up nor RPN Deck shows ads.

### Which is updated more often, Sum Up or RPN Deck?

Sum Up ships an update every 8 months, and RPN Deck every 11 days. Most recently, Sum Up was updated on October 7, 2026 and RPN Deck on October 15, 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.*