i41CX Downloads & Revenuei41CX · App Store
i41CX is #153 in Productivity Paid in France and charting in 7 of 30 countries we track.
Updated 11 Nov 2026 · rankings refresh through the day
DeveloperAntonio Lagana
CategoryProductivity
Price7.99 USD
Released
Rating★ 4.7 (47)
Version7.8.5
Age rating4+
First seen by us
25 Sep 2026
25 Sep 2026Installs (est.)5k+ worldwide
📦Updated to version 7.8.4📦Updated to version 7.8.3✏️New iPad screenshots✏️New screenshots📈Entered the top 100📈Charting in a new country🆕First spotted by AppInsider🆕Released on the App Store
Full timeline · 34 events
- 📦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 iPad 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 ["Printer" and "i41CX+ Features Upgrade"] or back view like on iPad 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 other view in the landscape view works just like on iPad by using horizontal swipes.
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 independent of feature upgrades. 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 entered the top 100Top Paid · Productivity · US
- 📈i41CX charting in a new countryUnited States
- ✏️i41CX: new iPad screenshots· BR, IT
- ✏️i41CX: new screenshots5 screenshots (was 5) · BR, IT
- ✏️i41CX: new iPad screenshots· ZA
- ✏️i41CX: new screenshots5 screenshots (was 5) · ZA
- 📈i41CX entered the top 10Top Paid · Productivity · ES
- ✏️i41CX: new iPad screenshots· AR
- ✏️i41CX: new screenshots5 screenshots (was 5) · AR
- ✏️i41CX: new iPad screenshots· 5 countries
- ✏️i41CX: new screenshots5 screenshots (was 5) · 5 countries
- 📈i41CX entered the top 100Top Paid · Productivity · FR
- 📦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 entered the top 100Top Paid · Productivity · ES
- ✏️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 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#88 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
4.7 ★
47 ratings
Measured
Best rank now
#153
Productivity PaidMeasured
i41CX on the App Store
App details
App ID
292619450
Publisher
Antonio Lagana
On the store since
Oct 2008
18 years on the store
Minimum OS
iOS 16.0+
iPhone 8 and later
Devices
iPhone · iPad
Universal purchase
Content rating
4+
Languages
1
EN
Size
141 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.
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 | #153 |
| Brazil | ProductivityPaid | #197 |
 Italy | ProductivityPaid | #185 |
 Mexico | ProductivityPaid | #161 |
 Spain | ProductivityPaid | #183 |
 Sweden | ProductivityPaid | #168 |
 Argentina | ProductivityPaid | #168 |
Apps near i41CX on the chart
Productivity Paid, around #153.
Ratings
App Store, worldwide.
Rating
4.7 ★
47 ratings
Measured
Ratings
47
Measured
Review momentum
ⓘ How we measure thisNew ratings a week
under 1
4-week average
Lifetime rating
4.6★
recent stars not readable yet: new ratings are a tiny share of the total
Review momentum
20/100
faster than 0% 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 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.
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.
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 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 
