Comparison

Stark Auth vs RB 20c Financial Calculator

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Stark Auth

Features
Read full description

Stark Auth is a two-factor authentication solution developed to enhance security in accessing the client account at Stark Bank. When logging in with Stark Auth, clients significantly reduce the chances of their accounts being compromised. This is due to the requirement of scanning a QR Code with a verified device, in addition to a password, to access their bank account. Detailing features: Enroll with Stark Auth as a new user by logging in with your Stark Bank account. Verify your email and phone number to activate the device. Approve or deny an attempt to log in to your Stark Bank account. Permissions: Camera access for scanning QR Code when authorizing a login. Functionality: With Stark Auth, bolster your Stark Bank account security by verifying your identity with a QR Code scan and password. Enroll seamlessly, verify your email and phone, and easily approve or deny login attempts.

About

RB 20c Financial Calculator

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
Read full description

RB 20c is a complete RPN financial calculator, compatible with the functions and keyboard of the classic HP 12C, using the same logic accountants and finance professionals have relied on for decades. Free version: • Four-level RPN stack, arithmetic, percentage, power and root • Memory registers (STO and RCL) • Time value of money: n, i, PV, PMT and FV • Simple interest and period-by-period amortization (AMORT) • Cash flow with CF0, CFj and Nj, NPV and IRR • Dates, day counts and date differences • Depreciation (SL, SOYD, DB), bond price and yield • Statistics: means, standard deviation and regression • Continuous memory: turn it off with the ON key and your calculation is kept • Built-in options manual Pro version (one-time purchase, no subscription): • Text summary of the calculation, with and without fees, ready to share by email or messaging • Period-by-period amortization table as PDF or Excel • Cash flow with NPV and IRR as PDF or Excel • History of your latest calculations, with date and time • Digital panel showing n, i, PV, PMT and FV next to the display • Key-press vibration Works fully offline. No ads, no account required. Designed for landscape use. HP and HP 12C are trademarks of HP Inc. RB 20c is an independent app, not affiliated with HP.

Screenshots

Stark Auth4 screens
RB 20c Financial Calculator4 screens

Verdict

The call

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.

Scored on Price Ā· Rating Ā· Positive reviews Ā· Number of ratings Ā· Update frequency Ā· Ads Ā· In-app purchases Ā· Monetization Ā· Best chart rank Ā· Devices Ā· Requires iOS

CostPrice Ā· In-app purchases Ā· Ads Ā· Monetization

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

UpkeepUpdate frequency

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.

Scorecard2 real differences Ā· 6 level
Stark Auth versus RB 20c Financial Calculator: the parameters behind the verdict, then further details
ParameterStark AuthRB 20c Financial Calculator
PriceFreeFree
Positive reviews—100.0% of reviews
Update frequencyEvery 3 monthsEvery 9 days — better
AdsNoNo
In-app purchasesNo — betterYes
Monetization—Freemium
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS15.615.0 — better
Further details — not scored
Size62 MB35 MB
Age rating4++4
DeveloperStark Bank S.A.Rodrigo Henrique Silva Barbosa

In-app purchases

None

Stark Auth

No in-app purchases

1 purchases

RB 20c Financial Calculator

One-time1
  • RB 20c Pro$1.99

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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