Comparison

i41CX vs Stelar

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

Head to head
About

i41CX

This app offers a powerful RPN scientific calculator experience, functionally equivalent to a renowned model. It provides extensive memory registers, over 300 built-in functions, and programmability. Advanced features can be unlocked via in-app purchases.

Highlights
  • RPN logic with 4-element stack
  • 319 main and 124 extended memory registers
  • Over 300 built-in functions
  • Programmable up to 2000 lines
  • User-definable keyboard
  • Bluetooth keyboard support
  • Device integration features
Read full description

i41CX is the same powerful advanced programmable RPN scientific calculator as the highly acclaimed i41CX+ but without the latter’s incredibly advanced capabilities such as the printer, expansion, CAS, etc. It is functionally equivalent to the world-renowned HP-41CX and inherits all of the i41CX+ usability features including extremely responsive and animated key clicks, audible key feedback sounds, optimally spaced keys for accurate input, traditional and upbeat modern diverse set of skins, etc. If you are looking for a powerful programmable RPN scientific calculator but don’t need all of the capabilities of i41CX+ then i41CX is for you. And best of all, if you ever decide that you need the more advanced capabilities of i41CX+ you can enable them using secure in-app purchases right within the app! FEATURES: • RPN logic with a 4 element deep memory stack • 319 main and 124 extended memory registers • Over 300 built-in functions, including nearly 100 functions created specifically for i41CX • Time, calendar, alarm, and stopwatch functions • Rich set of functions and algorithms: numerical, mathematical, statistical, and much more • Access to the entire HP-41 library of solutions for science, mathematics, statistics, engineering, business, financial, surveying, medicine, real estate, and many other domains • Programmable - Over 2000 lines • User definable keyboard • Ability to operate the calculator using a Bluetooth keyboard • Device integration: external display mirroring, copy and paste, GPS, accelerometer, digital compass, time and date synchronization, and much more • iOS 8 Notification Center widget • Sound support including synthetic tones and interface sounds • Support for calculator skins and optional mini stack display • Adjustable sound volume and display colors • Usage & Examples table with usage tips and examples • Quick reference guide of all built-in functions • Beautiful and clean user interface *********************************************************** A comprehensive FAQ is available at http://alsoftiphone.com/i41CX. Please don't hesitate to use the "Contact Us" link there if you cannot find the answers or information that you seek. Thank you.

About

Stelar

Features
Read full description

Stelar mobile application is intended to be used with the Stelar platform. The mobile application is used for field work, asset inventory, form filling, defect mapping. For more information please visit our website.

Screenshots

i41CX4 screens
Stelar4 screens

Verdict

The call

The clearest difference is price: Stelar at Free against i41CX's $7.99. Stelar also leads on in-app purchases (none vs 4). i41CX's advantage is chart position (#184 vs unranked). On update cadence, 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

Stelar is free to download; i41CX costs $7.99 up front. i41CX sells 4 one-off in-app purchases. Stelar asks for nothing beyond the download.

UpkeepUpdate frequency

i41CX ships an update every 5 weeks, Stelar monthly. The most recent releases landed on October 21, 2026 and October 6, 2026 respectively.

Scorecard3 real differences · 8 level
i41CX versus Stelar: the parameters behind the verdict, then further details
Parameteri41CXStelar
Price$7.99Free — better
Rating4.6 (45 ratings) — better—
Positive reviews90.5% of reviews—
Number of ratings45 — better—
Update frequencyEvery 5 weeksMonthly — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
Best chart rank#184 — better—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.0 — better15.1
Further details — not scored
Size135 MB183 MB
Age rating4+4+
DeveloperAntonio LaganaNorda Stelo Solutions

In-app purchases

4 purchases

i41CX

One-time4
  • Overlays Upgrade$2.99
  • Printer Upgrade$3.99
  • CAS Upgrade$7.99
Show 1 more
  • i41CX+ Features Upgrade$17.99
None

Stelar

No in-app purchases

Questions

Is i41CX free?
i41CX costs $7.99, and also offers in-app purchases.
Is Stelar free?
Stelar is free to download, with no in-app purchases.
Do i41CX or Stelar have ads?
Neither i41CX nor Stelar shows ads.
Which is updated more often, i41CX or Stelar?
i41CX ships an update every 5 weeks, and Stelar monthly. Most recently, i41CX was updated on October 21, 2026 and Stelar on October 6, 2026.

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