i41CX+ Downloads & Revenuei41CX+ · App Store
i41CX+ is #50 in Productivity Paid in France and charting in 6 of 30 countries we track.
Updated 11 Nov 2026 · rankings refresh through the day
DeveloperAntonio Lagana
CategoryProductivity
Price24.99 USD
Released
Rating★ 4.8 (109)
Version7.8.5
Age rating4+
First seen by us
25 Sep 2026
25 Sep 2026Installs (est.)10k+ worldwide
📦Updated to version 7.8.5📦Updated to version 7.8.4✏️New iPad screenshots✏️New screenshots⭐Passed 100 ratings📈Entered the top 100📈Charting in a new country⭐Passed 100 ratings🆕First spotted by AppInsider🆕Released on the App Store
Full timeline · 38 events
- 📦i41CX+ updated to version 7.8.5• Implemented option to select the interface style (iPhone or iPad) on the Mac. Interface style can be selected via the app's Settings > General > Interface Style item. When "iPhone" is selected, the app will look and operate exactly like the iPhone version.
• Implemented option to select the appearance (Light, Dark, or Auto) via the app's Settings > General > Appearance item. Skins and overlays aren't affected by the setting and most of the existing visual elements are custom and essentially "Dark" mode by design so there won't be major visual changes when changing the setting but user choice is a good thing, right?… more - 📦i41CX+ updated to version 7.8.4• The left and right view positions can now be swapped with a horizontal swipe when the display is open on the iPhone Duo.
NOTE: If the app's Settings > General > Horizontal Swipes setting is set to one of the SST/BST options, horizontal swipes over the calculator display area will not trigger the position switch. In that case, please swipe over other areas to switch the positions.
• Removed inapplicable settings on the Mac.
• Various bug fixes and internal optimizations.… more - 📦i41CX+ updated to version 7.8.3• Fixed bug that could cause audio from other apps to stop playing.
- 📦i41CX+ updated to version 7.8.2• Fixed portrait-mode size on iPad when the "Fill Screen in Portrait" setting is disabled.
- 📦i41CX+ updated to version 7.8.1• Updated to allow the black borders to disappear when the window is floating on iPad. The "Fill Screen in Portrait" setting needs to be enabled for this to occur when the floating window is in portrait view and black borders will be visible if the window is resized to an aspect ratio that differs from the app's intrinsic aspect ratio.
• Minor visual tweaks and improvements.… more - ✏️i41CX+: new iPad screenshots· ZA
- ✏️i41CX+: new screenshots5 screenshots (was 5) · ZA
- ✏️i41CX+: new iPad screenshots· 9 countries
- ✏️i41CX+: new screenshots5 screenshots (was 5) · 9 countries
- 📦i41CX+ updated to version 7.8.0• Added support for Mac. The app can now be installed on Apple Silicon Macs running Golden Gate or later from the Mac App Store.
On the Mac, the app adopts a more compact interface than on iPads to allow it to be used as a small floating window alongside other apps, much as a physical calculator is used on a real desk. In its full-size view (i.e. landscape), the app is roughly the same size as an iPad mini in landscape orientation but it is smaller in its collapsed (i.e. portrait) view.
Since there is no notion of rotation on the Mac, the display can be switched between showing just the calculator or the calculator and printer like on iPads by either using the Mac menu bar's i41CX+ > Window > Zoom menu item or by dragging either edge of the app window to expand or collapse it horizontally. Swapping the positions of the calculator and the printer in the landscape view works just like on the iPad by using a horizontal swipe.
NOTE: Because there is always a hardware keyboard on the Mac, the "Alpha Entry" switch setting is ignored and all entry can be done via the keyboard just like when using a hardware/Bluetooth keyboard on the iPhone/iPad. With a few exceptions (see below), the hardware keyboard keys are mapped according to the ALPHA mode labels shown on the keypad. For example, 'K' is mapped to XEQ and shifted 'K' is mapped to SHIFT XEQ (ASN). Numerical and arithmetic operator keys are mapped directly. For example, the hardware keyboard sequence "6 return 7 *" calculates the product of 6 and 7. The exceptions to these rules are listed below.
! → ON
@ → USER
# → toggle overlay/skin/display control panel
$ → PRGM
% → ALPHA
` → SHIFT
tab → R/S
' → VIEW/AVIEW
return → ENTER in normal mode, exit ALPHA in ALPHA mode
＞ → SST
＜ → BST
{ → CLX/A
shift N → CAT
shift K → ASN in normal mode, append in ALPHA mode
shift L → LBL in normal mode, ASTO in ALPHA mode
shift M → GTO in normal mode, ARCL in ALPHA mode
Q~Z, =, ?, :, space, and comma → the SHIFT'ed functions on the labelled keys
( → switch between printer and calculator views
) → switch between calculator and back views
& → toggle printer on/off
[, ] → switch printer mode left, right
| → print
; → paper advance
_ → tear paper roll
} → new paper roll
• Various visual and interface tweaks.
• Minor bug fixes and internal optimizations.… more - ✏️i41CX+: new iPad screenshots· BR, IT
- ✏️i41CX+: new screenshots5 screenshots (was 5) · BR, IT
- ✏️i41CX+: new iPad screenshots· FR, ZA
- ✏️i41CX+: new screenshots5 screenshots (was 5) · FR, ZA
- 📈i41CX+ entered the top 100Top Paid · Productivity · SA
- 📈i41CX+ charting in a new countrySaudi Arabia
- ✏️i41CX+: new iPad screenshots· ES, AR
- ✏️i41CX+: new screenshots5 screenshots (was 5) · ES, AR
- ✏️i41CX+: new iPad screenshots· 4 countries
- ✏️i41CX+: new screenshots5 screenshots (was 5) · 4 countries
- 📦i41CX+ updated to version 7.7.2• Minor bug fixes and internal optimizations.
- 📦i41CX+ updated to version 7.7.1• Updated to use long press for copy/paste
- ✏️i41CX+: needs a newer iOSiOS 15.0 → iOS 16.0
- 📦i41CX+ updated to version 7.7.0• Optimized for iPhone Duo.
• Various visual and interface tweaks.
• Minor bug fixes and internal optimizations.
NOTE: The app now requires iOS 16.0 or later. - 📦i41CX+: now updating weekly4 updates in 30 days, after a quiet two months
- 📦i41CX+ updated to version 7.6.27• Fixed display glitches on devices with "Display Zoom" set to "Larger Text".
- 📦i41CX+ updated to version 7.6.26• Fixed bug inadvertently introduced in a recent release.
- 📦i41CX+ updated to version 7.6.25• iPhone Duo compatibility
- 📈i41CX+ entered the top 100Top Paid · Productivity · DE
- 📈i41CX+ charting in a new countryGermany
- 📈i41CX+ entered the top 100Top Paid · Productivity · US
- 📦i41CX+ updated to version 7.6.24• iOS 27 compatibility fixes.
• Minor bug fixes and internal optimizations.
NOTE: The app now requires iOS 15.0 or later. - 🆕i41CX+ first spotted by AppInsider#78 in Top Paid · Productivity · Brazil
- 📦i41CX+ version 7.6.23• Minor visual improvements.
- 🆕i41CX+ released on the App Store
Collected from the stores by AppInsider since we first spotted the app. Dates are when we saw each change.
Rating
4.8 ★
109 ratings
Measured
Best rank now
#50
Productivity PaidMeasured
i41CX+ on the App Store
App details
App ID
289068865
Publisher
Antonio Lagana
Minimum OS
iOS 16.0+
iPhone 8 and later
Devices
iPhone · iPad
Universal purchase
Content rating
4+
Languages
1
EN
Size
130 MB
Also listed in
Utilities
i41CX+ downloads
Worldwide, per day, and installs to date. The band is open; the exact number is free with an account.
How this is calculated
Apple publishes no download counts. App Store downloads come from chart positions and daily rating growth per country, calibrated on Google Play install counts; lifetime installs from ratings worldwide × installs per rating. Confidence is the chance the real number is within half to double ours.
Where i41CX+'s downloads come from Modelled
Last 30 days: organic search, browsing the store, features and paid ads.
Active users
All platforms, worldwide. Free with an account.
Stickiness (DAU / MAU)
how many monthly users open it on a given day
How this is calculated
Monthly users come from lifetime installs across every store, fitted on monthly active user figures companies publish; daily users = monthly × the typical daily/monthly ratio for the category. Confidence is the chance the real number is within half to double ours.
Where it ranks now
Every top chart it appears in across 30 countries.
| Country | Charts | Rank |
|---|---|---|
| France | ProductivityPaid | #50 |
| Brazil | ProductivityPaid | #188 |
 Italy | ProductivityPaid | #152 |
 Mexico | ProductivityPaid | #127 |
 Netherlands | ProductivityPaid | #173 |
 Argentina | ProductivityPaid | #163 |
Apps near i41CX+ on the chart
Productivity Paid, around #50.
Ratings
App Store, worldwide.
Rating
4.8 ★
109 ratings
Measured
Ratings
109
Measured
Review momentum
ⓘ How we measure thisNew ratings a week
under 1
4-week average
Lifetime rating
4.8★
recent stars not readable yet: new ratings are a tiny share of the total
Review momentum
45/100
faster than 42% of Productivity apps
Review momentum (0-100) blends how fast the app collects ratings compared with other apps in its category (60%), whether that pace is speeding up (25%) and what recent raters give it (15%; recent stars well below lifetime pull it down). Ratings counts are read daily. A jump usually means a launch, a feature, ads or a new review prompt.
About i41CX+
i41CX+ is an advanced programmable and expandable RPN scientific calculator with a virtual thermal printer/plotter and workstation-class CAS capabilities that is far beyond a mere replica of the original. In addition to being functionally equivalent to the world-renowned HP-41CX and providing access to its entire library of modules and programs, i41CX+ is enhanced with iOS and hardware features, keyboard overlays, rich set of import and export capabilities, traditional and upbeat diverse set of skins, complete color control, iCloud support, and much more.
The i41CX+ CAS is a full implementation of REDUCE. It's like having Mathematica or the computational engine of Wolfram Alpha in your pocket and, best of all, it runs natively so no internet connection is required. The CAS is fully programmable and provides the ability to reuse previous results in computations. Moreover, the CAS has full access to the calculator registers so it is possible to combine RPN programs with CAS programs.
This is the finest and most powerful scientific/engineering/financial calculator for iOS devices bar none.
CALCULATOR FEATURES:
• RPN logic with a 4 element deep memory stack
• 319 main and 600 extended memory registers
• Over 400 built-in functions, including over 100 functions created specifically for i41CX+
• Time, calendar, alarm, and stopwatch functions
• Four module ports provide access to HP-41 expansion pacs
• Rich set of functions and algorithms: numerical, mathematical, statistical, complex, matrix, numerical integration, curve fitting, solutions to equations, and much more
• Powerful, flexible, and programmable Computer Algebra System (CAS) supporting symbolic, arbitrary precision, scalar, vector and matrix algebra calculations, 2D/3D plotting, and much more
• Full-screen text editor with configurable font style and size, color scheme, a user configurable macro keyboard, and a numerical keyboard
• 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 - virtually unlimited number of lines
• User definable keyboard
• Ability to operate the calculator using a Bluetooth keyboard
• Device integration: external display mirroring, copy and paste, in-app mail, system keyboard, GPS, accelerometer, digital compass, time and date synchronization, AirPrint, and much more
• Virtually unlimited data and program storage capacity using the device's flash memory for local storage
• Import/export data, programs, overlays, modules, etc. via the web, email, and iTunes file sharing
• iCloud syncing of files and preference settings
• iOS 8 Notification Center widget
• 43 available keyboard overlays and support for user created overlays
• Sound support including synthetic tones and interface sounds
• Support for calculator skins and optional mini stack display
• Adjustable calculator speed, sound volume, and display colors
• Usage & Examp
The i41CX+ CAS is a full implementation of REDUCE. It's like having Mathematica or the computational engine of Wolfram Alpha in your pocket and, best of all, it runs natively so no internet connection is required. The CAS is fully programmable and provides the ability to reuse previous results in computations. Moreover, the CAS has full access to the calculator registers so it is possible to combine RPN programs with CAS programs.
This is the finest and most powerful scientific/engineering/financial calculator for iOS devices bar none.
CALCULATOR FEATURES:
• RPN logic with a 4 element deep memory stack
• 319 main and 600 extended memory registers
• Over 400 built-in functions, including over 100 functions created specifically for i41CX+
• Time, calendar, alarm, and stopwatch functions
• Four module ports provide access to HP-41 expansion pacs
• Rich set of functions and algorithms: numerical, mathematical, statistical, complex, matrix, numerical integration, curve fitting, solutions to equations, and much more
• Powerful, flexible, and programmable Computer Algebra System (CAS) supporting symbolic, arbitrary precision, scalar, vector and matrix algebra calculations, 2D/3D plotting, and much more
• Full-screen text editor with configurable font style and size, color scheme, a user configurable macro keyboard, and a numerical keyboard
• 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 - virtually unlimited number of lines
• User definable keyboard
• Ability to operate the calculator using a Bluetooth keyboard
• Device integration: external display mirroring, copy and paste, in-app mail, system keyboard, GPS, accelerometer, digital compass, time and date synchronization, AirPrint, and much more
• Virtually unlimited data and program storage capacity using the device's flash memory for local storage
• Import/export data, programs, overlays, modules, etc. via the web, email, and iTunes file sharing
• iCloud syncing of files and preference settings
• iOS 8 Notification Center widget
• 43 available keyboard overlays and support for user created overlays
• Sound support including synthetic tones and interface sounds
• Support for calculator skins and optional mini stack display
• Adjustable calculator speed, sound volume, and display colors
• Usage & Examp
Latest updates
7.8.5
• Implemented option to select the interface style (iPhone or iPad) on the Mac. Interface style can be selected via the app's Settings > General > Interface Style item. When "iPhone" is selected, the app will look and operate exactly like the iPhone version.
• Implemented option to select the appearance (Light, Dark, or Auto) via the app's Settings > General > Appearance item. Skins and overlays aren't affected by the setting and most of the existing visual elements are custom and essentially "Dark" mode by design so there won't be major visual changes when changing the setting but user choice is a good thing, right?
7.8.4
• The left and right view positions can now be swapped with a horizontal swipe when the display is open on the iPhone Duo.
NOTE: If the app's Settings > General > Horizontal Swipes setting is set to one of the SST/BST options, horizontal swipes over the calculator display area will not trigger the position switch. In that case, please swipe over other areas to switch the positions.
• Removed inapplicable settings on the Mac.
• Various bug fixes and internal optimizations.
7.8.3
• Fixed bug that could cause audio from other apps to stop playing.
Store changes
What i41CX+ changed on its store page: name, icon, screenshots, price, size, languages, requirements.
New iPad screenshots 
New screenshots
5 screenshots (was 5)
New iPad screenshots 
