Comparison

Idea Hack vs RPN

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

Head to head
About

Idea Hack

This app helps spark creativity by generating three random keywords to inspire new ideas. Users can register their own keywords and use the tool to brainstorm solutions or concepts, saving their thoughts in a memo field.

Highlights
  • Generate random keywords
  • Create custom keyword lists
  • Brainstorm ideas based on keywords
  • Save ideas to memo
  • Supports iPhone, iPad, iPod
Features
Read full description

The idea is not float ... Submit ideas until tomorrow ... At that time, this app It is an application that idea gives rise. It is a tool to help the idea of ​​creation. Ideas is important. It is also possible to change the world in one idea. By utilizing the three keywords you can create an idea that did not come up until now. Head will activate only the keyword than thinking through the use randomly. ---------------------------- How to use ---------------------------- As much as you can be registered keywords related to it. ※ There are also unexpected ideas and to register a keyword that are not relevant are created. Start the idea hack tool. Three keywords will come out, so consider the relevant ideas. Write to the memo field that noticed. When it does not come out and go to the next keyword. Notice when many of the ideas have been created.

About

RPN

This app is a photo-realistic simulation of a classic Hewlett-Packard programmable business calculator. It offers advanced programming features, extensive register memory, and a library of pre-installed programs for various financial and statistical calculations.

Highlights
  • Photo-realistic look-and-feel
  • Programmable with subroutines and flags
  • 20 registers with unlimited store/recall
  • Indirect register addressing
  • Program library and sharing
  • Financial and statistical functions
  • Date and calendar calculations
Features
Read full description

RPN-38 CX is the first photo-realistic simulation of Hewlett-Packard's popular high-end programmable business calculator HP-38C for the iPhone. Produced from 1979 through 1983, it was the "Chive" member of the third-generation HP calculators known as the "Spice" series. While the simulator works like the original calculator, a number of carefully designed extensions make it a lot easier to use. RPN-38 CX is fully compatible with the HP-12C, except for calculations and programs involving Bonds and Depreciation. Features: • Photo-realistic look-and-feel • Programmable (99 steps, program memory not shared with register memory) • Subroutines, flags, loop control, extended conditional branching • Insert and delete steps with automatic address correction • 20 registers, "continuous", with unlimited store/recall arithmetic • Indirect register addressing • Register view • Program listing view • Program library view • Additional functions (nominal and effective interest rate) • Shortcuts for often-used key combinations • Store and retrieve any number of programs • Sharing: e-mail, AirDrop, Dropbox, copy, paste, print • 40 programs pre-installed Calculator functions: • Percentage (%, ∆%, %Total) • Simple and Compound Interest • Optional odd periods (like HP-12) • Nominal/Effective interest rate conversion • Amortization • Discounted Cash Flow Analysis • Net Present Value, Internal Rate of Return • Date and Calendar (actual or 30/360 day basis) • Statistics (mean, weighted mean, standard deviation) • Linear Regression • Additional functions not found on the HP-38: - Subroutines, flags, loop control, random number, Pi, Log, x² and more Details: cuveesoft.ch/rpn38

Screenshots

Idea Hack4 screens
RPN4 screens

Verdict

The call

The clearest difference is review sentiment: RPN at 100% against Idea Hack's 50%. RPN also leads on rating (5.0 vs 3.0) and ratings volume (6 vs 1). Idea Hack's advantage is price (Free vs $1.99) and update cadence (every 5 days vs every 2 months). On ads, in-app purchases 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

Idea Hack 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

RPN holds the better App Store score, 5.0 against 3.0. That said, the two scores are not equally well evidenced: RPN has 6 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 50% of Idea Hack's written reviews are positive against 100% of RPN's.

UpkeepUpdate frequency

Idea Hack ships an update every 5 days, RPN every 2 months. The most recent releases landed on October 17, 2026 and October 12, 2026 respectively.

Scorecard7 real differences · 3 level
Idea Hack versus RPN: the parameters behind the verdict, then further details
ParameterIdea HackRPN
PriceFree — better$1.99
Rating3.0 (1 ratings)5.0 (6 ratings) — better
Positive reviews50.0% of reviews100.0% of reviews — better
Number of ratings16 — better
Update frequencyEvery 5 days — betterEvery 2 months
AdsNoNo
In-app purchasesNoNo
MonetizationFree — betterPaid
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS8.0 — better12.0
Further details — not scored
Size23 MB12 MB
Age rating4+4+
DeveloperTAKAHIRO AYACuVee Software

Customer experience

Idea Hack

All ratings1 ratings
Positive0.0%
Neutral100.0%
Negative0.0%
Written reviews2 reviews
Positive50.0%
Neutral50.0%
Negative0.0%

RPN

All ratings6 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews4 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Idea Hack

No in-app purchases

None

RPN

No in-app purchases

Questions

Is Idea Hack free?
Idea Hack 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, Idea Hack or RPN?
RPN is rated higher. Idea Hack averages 3.0 out of 5 from 1 ratings, while RPN averages 5.0 from 6 ratings.
Do Idea Hack or RPN have ads?
Neither Idea Hack nor RPN shows ads.
Which is updated more often, Idea Hack or RPN?
Idea Hack ships an update every 5 days, and RPN every 2 months. Most recently, Idea Hack was updated on October 17, 2026 and RPN on October 12, 2026.

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