RPN vs VerilogEditor
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 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
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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
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.
- Intuitive GUI for Verilog code generation
- Browse VCD data for simulation analysis
- Streamlined digital circuit design workflow
- Supports iPhone and iPad
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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
Verdict
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
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.
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.
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.
| Parameter | RPN | VerilogEditor |
|---|---|---|
| Price | $1.99 | Free — better |
| Rating | 5.0 (8 ratings) — better | 3.0 (2 ratings) |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | 8 — better | 2 |
| Update frequency | Every 3 months — better | Every 4 months |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Freemium — better |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 12.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 17 MB | 15 MB |
| Age rating | 4+ | 4+ |
| Developer | CuVee Software | AIP Technology Corporation, Taiwan Branch |
Customer experience
RPN
VerilogEditor
In-app purchases
RPN
No in-app purchases
VerilogEditor
- BasicUser3 Days trial$0.991 Month









