# Stark Auth vs RB 20c Financial Calculator

The clearest difference is in-app purchases: Stark Auth at none against RB 20c Financial Calculator's 1. RB 20c Financial Calculator's advantage is update cadence (every 9 days vs every 3 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. RB 20c Financial Calculator sells 1 one-off in-app purchase. Stark Auth asks for nothing beyond the download.

Stark Auth ships an update every 3 months, RB 20c Financial Calculator every 9 days. The most recent releases landed on October 14, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | Stark Auth | RB 20c Financial Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 9 days** |
| Monetization | — | Freemium |
| Size | 62 MB | 35 MB |
| Requires iOS | 15.6 | **15.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | +4 |
| Developer | [Stark Bank S.A.](https://appshunter.io/developer/1620050036) | [Rodrigo Henrique Silva Barbosa](https://appshunter.io/developer/6821708023) |

## What reviewers say

### Stark Auth

[App page](https://appshunter.io/ios/app/stark-auth/id6480134848)

**Features:** macOS Compatibility

**In-app purchases:** none


### RB 20c Financial Calculator

[App page](https://appshunter.io/ios/app/rb-20c-financial-calculator/id6821708021)

This app emulates the functionality of a classic financial calculator, offering RPN input and a comprehensive suite of financial, statistical, and date calculation tools. It provides both a free version with core features and a Pro version with advanced sharing and export capabilities.

**Highlights:** RPN stack with arithmetic operations, Time Value of Money calculations, Cash flow analysis (NPV, IRR), Statistical functions, Date calculations, Bond pricing and depreciation, Pro version export to Excel

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| RB 20c Pro | $1.99 | one-time |


## Frequently asked questions

### Is Stark Auth free?

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

### Is RB 20c Financial Calculator free?

RB 20c Financial Calculator is free to download, with in-app purchases available.

### Do Stark Auth or RB 20c Financial Calculator have ads?

Neither Stark Auth nor RB 20c Financial Calculator shows ads.

### Which is updated more often, Stark Auth or RB 20c Financial Calculator?

Stark Auth ships an update every 3 months, and RB 20c Financial Calculator every 9 days. Most recently, Stark Auth was updated on October 14, 2026 and RB 20c Financial Calculator on October 26, 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.*