Comparison

RPN vs VerilogEditor

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 photo-realistic simulation of a classic Hewlett-Packard programmable scientific calculator from the 1970s. It includes a 100-hour digital timer, clock functions, and original HP programs.

Highlights
  • Photo-realistic look-and-feel
  • Programmable with conditional branching
  • 100-hr timer and 12/24-hr clock
  • Original HP programs built-in
  • Extended features for enhanced usability
  • Sharing via email, AirDrop, and more
Features
Read full description

RPN-55 SD is the first photo-realistic simulation for the iPhone of Hewlett-Packard's low-cost alternative to the famous HP-65 programmable scientific calculator. Produced from 1975 through 1977, it was the "Merlin" member of the classic HP calculator series, priced at $395. HP claimed that it featured "(...) more pre-programmed functions than any other scientific pocket calculator in the world." A main feature of the HP-55 was a crystal-controlled 100-hr digital timer with the ability to store times while the timer was running and later recall them. On RPN-55 SD the timer may also act as a 12-hr or 24-hr clock, including date and weekday display. While the simulator works just like the original calculator – except being much faster and having twice the program memory – you can turn on extended features to make it even more enjoyable to use. RPN-55 SD comes complete with original HP programs built in. Features: • Photo-realistic look-and-feel • Vintage mode or Extended mode • Programmable (99 steps), conditional branching • Insert and delete steps with automatic address correction • Delete range of steps • Subroutines (4 levels) • 20 registers, "continuous", with unrestricted store/recall arithmetic • "Live" register view • Program listing view • Program library view • Store and retrieve any number of programs • 100-hr timer supporting 10 split times and 12/24-hr clock mode with date • Swap unit conversions with additional functions, e.g. hyperbolics • Sharing: e-mail, AirDrop, Dropbox, copy, paste, print • 112 programs pre-installed Calculator functions: • Statistics (linear regression, mean, standard deviation, correlation coefficient, x- and y-estimates) • Trigonometric functions (degrees, radians, grads) • Polar/rectangular conversions • Inverse, square root, logarithm, exponential, pi • Storage arithmetic (store and recall) • Percent, absolute, integer, fractional value, round • Factorial • Random number • Unit and hours conversions Details: cuveesoft.ch/rpn55

About

VerilogEditor

Generate Verilog code for digital circuit design using an intuitive graphical interface. Inspect and analyze simulation results by browsing VCD data. Streamline your hardware design workflow.

Highlights
  • Intuitive GUI for Verilog code generation
  • Browse VCD data for simulation analysis
  • Streamlined digital circuit design workflow
  • Supports iPhone and iPad
Features
Read full description

This application provides an intuitive graphical user interface (GUI) that allows users to quickly generate Verilog code for digital circuit design. In addition to code generation, the app also supports browsing VCD (Value Change Dump) data, making it easier to inspect and analyze simulation results. Contact us: marslee@aipesd.com Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://www.aipesd.com/en/%E9%9A%B1%E7%A7%81%E6%AC%8A%E8%81%B2%E6%98%8E/

Screenshots

RPN4 screens
VerilogEditor4 screens

Verdict

The call

The clearest difference is price: VerilogEditor at Free against RPN's $1.99. RPN's advantage is rating (5.0 vs 3.0) and in-app purchases (none vs 1). On review sentiment, update cadence, ads and device support 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

VerilogEditor is free to download; RPN costs $1.99 up front. VerilogEditor sells 1 in-app purchase, starting at $0.99 per month. RPN asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

RPN holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 8 and 2 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

UpkeepUpdate frequency

RPN ships an update every 3 months, VerilogEditor every 4 months. The most recent releases landed on September 6, 2026 and September 9, 2026 respectively.

Scorecard6 real differences · 4 level
RPN versus VerilogEditor: the parameters behind the verdict, then further details
ParameterRPNVerilogEditor
Price$1.99Free — better
Rating5.0 (8 ratings) — better3.0 (2 ratings)
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings8 — better2
Update frequencyEvery 3 months — betterEvery 4 months
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFreemium — better
DevicesiPhone, iPodiPhone, iPad
Requires iOS12.0 — better18.0
Further details — not scored
Size17 MB15 MB
Age rating4+4+
DeveloperCuVee SoftwareAIP Technology Corporation, Taiwan Branch

Customer experience

RPN

All ratings8 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews5 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

VerilogEditor

All ratings2 ratings
Positive50.0%
Neutral0.0%
Negative50.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

RPN

No in-app purchases

1 purchases

VerilogEditor

Subscriptions1
  • BasicUser3 Days trial$0.991 Month

Questions

Is RPN free?
RPN costs $1.99, with no in-app purchases.
Is VerilogEditor free?
VerilogEditor is free to download, with in-app purchases available.
Which has better reviews, RPN or VerilogEditor?
RPN is rated higher. RPN averages 5.0 out of 5 from 8 ratings, while VerilogEditor averages 3.0 from 2 ratings.
Do RPN or VerilogEditor have ads?
Neither RPN nor VerilogEditor shows ads.
Which is updated more often, RPN or VerilogEditor?
RPN ships an update every 3 months, and VerilogEditor every 4 months. Most recently, RPN was updated on September 6, 2026 and VerilogEditor on September 9, 2026.

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