Comparison

SubcommPools vs RPN

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

Head to head
About

SubcommPools

Manage your pool service history with this app. View detailed reports including measurements, chemical levels, and technician messages. Receive real-time notifications for completed visits with comprehensive reports.

Highlights
  • Full pool service history
  • Detailed visit reports
  • Chemical and measurement logs
  • Technician messages and images
  • Real-time visit completion notifications
Features
Read full description

Application for current and future clients of SubcommPools LLC. Our mission in SubcommPools is to deliver the best pool service to our clients and to level up the pool service standards. With this mobile app, clients will have full history for their pools. Reported data as measurements, chemicals, time, messages from our technician, images of the pool etc. Clients receive in real time notifications for finished visitation with full report of the visit. The application is in continues development and many more features are planned and will be available in next versions.

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

Screenshots

SubcommPools4 screens
RPN4 screens

Verdict

The call

The clearest difference is price: SubcommPools at Free against RPN's $1.99. RPN's advantage is ratings volume (8 vs 2) and iOS requirement (12.0 vs 15.6). On rating, review sentiment, update cadence and ads 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

SubcommPools is free to download; RPN costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for SubcommPools against 5.0 for RPN. Both are backed by a comparable volume of ratings — 2 and 8 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 3 months. The most recent releases landed on September 9, 2026 and September 6, 2026 respectively.

Scorecard4 real differences · 6 level
SubcommPools versus RPN: the parameters behind the verdict, then further details
ParameterSubcommPoolsRPN
PriceFree — better$1.99
Rating5.0 (2 ratings)5.0 (8 ratings)
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings28 — better
Update frequencyEvery 3 monthsEvery 3 months
AdsNoNo
In-app purchasesNoNo
MonetizationFree — betterPaid
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS15.612.0 — better
Further details — not scored
Size63 MB17 MB
Age rating4+4+
DeveloperSubcomm LLCCuVee Software

Customer experience

SubcommPools

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

RPN

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

In-app purchases

None

SubcommPools

No in-app purchases

None

RPN

No in-app purchases

Questions

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

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