Comparison

RPN vs DPass

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

Head to head
About

RPN

This app is a faithful simulation of a rare 1974 financial calculator, offering all its original functions with enhanced features like more memory registers and a visual stack display. It's designed for users who appreciate vintage technology and need precise financial calculations.

Highlights
  • Photo-realistic vintage calculator design
  • Full HP-70 function simulation
  • Animated keys with sound
  • Enhanced stack and memory register view
  • Cut/copy/paste display value
  • Input parameter visual indicators
Features
Read full description

RPN-70 SD is a complete simulation of the financial hand-held calculator HP-70 from 1974. It handles loan amortization, saving plans, depreciation, and much more with ease. What users said: "Looks good, all functions you need. Love it!" "This is a beautiful emulation of a very rare HP financial calculator from 1974. Works just like the original but better! Faster, more accurate, with 10 more storage registers, and a popup window lets you see the contents of each stack, financial and storage register. Provides TVM4 functionality for compound interest as well as accumulated simple interest. A true work of art!" Features: • Photo-realistic look based on an existing device • Animated keys with click sound (adjustable volume) • All functions and operations of the HP-70 fully implemented • Correct wrong number entries by swiping across the display • Cut/copy/paste of display value • Double-tap display to view the stack and memory registers • Visual indicators keep track of input parameters entered • 10 non-volatile memory registers (not available in original HP-70) The HP-70 was discontinued after just one year. It is one of the rarest calculators, hard to find in any condition. NOTE: RPN-70 SD is a faithful simulation of a vintage HP-70 calculator, as has been verified against a real device using the examples in the Applications Cookbook section of the HP-70 manual. In certain cases, what may appear like a bug of the app is actually an idiosyncrasy of the HP-70. IMPORTANT: The HP-70 requires exactly three input parameters from the top-row keys, at least one of them being either "n" or "i". In other words, you can't use PMT, PV, and FV as input parameters simultaneously. A version for the iPhone named "RPN-70 HD" is also available. Short manual and sample calculations on the website: www.cuveesoft.ch

About

DPass

Features
Read full description

Digitalize your physical cards, generate barcode, QR code for scanners. Store other sensitive private data. Build your own template to convenient create new entry, and synchronize data to cloud, share them between your own devices.

Screenshots

RPN4 screens
DPass4 screens

Verdict

The call

The clearest difference is in-app purchases: RPN at none against DPass's 1. DPass's advantage is update cadence (every 3 months vs every 7 months). On price, ads, 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

CostPrice · In-app purchases · Ads · Monetization

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

UpkeepUpdate frequency

RPN ships an update every 7 months, DPass every 3 months. The most recent releases landed on October 4, 2026 and October 6, 2026 respectively.

Scorecard2 real differences · 8 level
RPN versus DPass: the parameters behind the verdict, then further details
ParameterRPNDPass
PriceFreeFree
Rating4.7 (11 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings11 — better—
Update frequencyEvery 7 monthsEvery 3 months — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS12.0 — better13.0
Further details — not scored
Size17 MB33 MB
Age rating4+4+
DeveloperCuVee SoftwareXIAOTIAN CHEN

In-app purchases

None

RPN

No in-app purchases

1 purchases

DPass

One-time1
  • Unlock Capacity$0.99

Questions

Is RPN free?
RPN is free to download, with no in-app purchases.
Is DPass free?
DPass is free to download, with in-app purchases available.
Do RPN or DPass have ads?
Neither RPN nor DPass shows ads.
Which is updated more often, RPN or DPass?
RPN ships an update every 7 months, and DPass every 3 months. Most recently, RPN was updated on October 4, 2026 and DPass on October 6, 2026.

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