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RPN-45 HD is a complete simulation of the scientific hand-held calculator HP-45 from 1973. Processing times and behavior have been carefully modelled after the original. Switch to the "Super-45" mode and watch the HP-45 do things never seen before.


• Photo-realistic look based on an existing device
• Animated keys with adjustable click sound and visual feedback
• All functions and operations of the HP-45 fully implemented
• Supports "secret" timer with either 12 or 100 hours capacity
• Optional hyperbolic functions
• Simulation of the HP-45's computation times (optional)
• Correct wrong number entries by swiping left across the display
• Cut/copy/paste of display value
• "Live" display of stack and all memory registers (in landscape mode)
• Built-in manual
• 30 selectable background images, even add your own

Turn on "Super-45" and enjoy a super-charged HP-45:

• Complex numbers: perform almost all operations and functions on complex numbers.
• More memory: twice the number of memory registers.
• Non-volatile memory: stack and memory registers are not lost on restart.
• Extended functions:
- Raise any number to any power
- Faculty of any number
- Logarithm and square root of negative numbers
- Preset timer with the iPad's real time
• New functions:
- Solve linear equations in two unknowns
- Find the roots of quadratic and cubic equations
- Statistics: normal distribution and correlation coefficient of paired variables
- Linear regression, combinations, permutations
- Integer and fractional parts
- Random numbers in a specific range
- Display rounding
- Day of the week for any date between Jan 1, 0001 and Dec 31, 9999
- Number of days between any two dates; support for Julian dates
• Enhanced user interface:
- Visual indicators for prefix keys and angular modes
- Small values switch to scientific notation if required

For more information and sample calculations visit


"A great simulation of the HP-45. Beautifully made, with a lot of attention to small details."
"This is by far the best RPN calculator available for the iPad!"
"Great app that I would recommend to anyone who grew up with an HP-45!"
"This is one of the most accurate but also nicest looking emulators I have come across for the HP-45, or any vintage HP calculator for that matter."
"This is exactly what I've been searching. My HP 45 packed up some time ago. Thank you so much!"

Novedades de la versión 2.5

• HP-45 low-battery warning (all decimal points lit) if iPad's battery drops below 5%
• Polar-rectangular (and vice versa) conversion extended to hyperbolic mode
• Improved sound volume control
• Better legibility of extra functions
• 64-bit support

Bug fixes:
• Calculator didn't turn itself on automatically (iOS 8)
• Fixed display rounding error
• LastX didn't work if RCL / n produced an error

Capturas de pantalla del iPad

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Captura de pantalla del iPad 2
Captura de pantalla del iPad 3
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Captura de pantalla del iPad 5
Ver en iTunes
  • USD 2.99
  • Categoría: Productividad
  • Actualizado : 25/02/2015
  • Versión: 2.5
  • Tamaño: 32.6 MB
  • Idiomas: Alemán, En
  • Vendedor: Willy Kunz

Compatibilidad: Requiere iOS 5.1.1 o posterior. Compatible con iPad.

Valoraciones de clientes

No hemos recibido suficientes valoraciones para poder mostrar un promedio de la versión actual de este artículo.

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