RPN-70 HD is a complete, photo-realistic simulation of the financial hand-held calculator HP-70 from 1974. It handles loan amortization, saving plans, depreciation, and much more with ease. What users said: "Hard to find...
RPN-70 HD is a complete, photo-realistic simulation of the financial hand-held calculator HP-70 from 1974. It handles loan amortization, saving plans, depreciation, and much more with ease. What users said: "Hard to find a decent calculator on iPad, try this one." "I don't normally write reviews but RPN-70 is just too fantastic to not get excited about. Apple should list this app under their Education category in the App Store and make it a must have for every college bound student. It is the best HP emulator in the market." "An incredibly well-engineered calculator app, and free, to boot!" "This is a really cool Financial calculator. Just like using the original HP-70. Accurate to the penny." Features: . Photo-realistic look based on an existing device . "Live" register view in landscape mode . Animated keys with click sound (adjustable volume) . All functions and operations of the HP-70 fully implemented . Simulation of the HP-70's computation time (optional) . Correct wrong number entries by swiping left across the display . Cut/copy/paste of display value . Visual indicators keep track of stored input parameters (optional) . Stack shown right below display (optional) . 10 non-volatile memory registers (optional) . Built-in short manual with many examples The HP-70 was discontinued after just one year. It is one of the rarest calculators, hard to find in any condition. NOTE: RPN-70 HD is a faithful simulation of a vintage HP-70 calculator, as has been verified against a real device using the examples in the Applications Cookbook section of the HP-70 manual. In certain cases, what may appear like a bug of the app is actually an idiosyncrasy of the HP-70. IMPORTANT: The HP-70 requires exactly three input parameters from the top-row keys, at least one of them being either "n" or "i". In other words, you can't use PMT, PV, and FV as input parameters simultaneously. A version for the iPhone named "RPN-70 SD" is also available. Visit the website: www.cuveesoft.ch
Version History • All registers are now non-volatile. • Double-tapping the display acts like the View/Registers button (bottom-right). • Triple-tapping the display: - Clears registers R0..R9 (only if enabled in Settings). - Resets the register K to 12. 3.4 07/28/2025 • Faster startup – no delay until the first button press is recognized after switching on. 3.3 05/09/2025 • RPN-70 HD runs on Apple Silicon Macs (see notes on homepage cuveesoft.ch). • Disabled low-battery indicator (all decimal points lit) when running on Apple Silicon Mac. • RPN-70 HD requires iOS 12 or later. 3.2 11/07/2024 • iPadOS 16 compatibility 3.1.5 11/09/2022 • iPad mini (2021) compatibility 3.1.2 10/03/2021 • Suppressed clipboard notification on each keypress (iOS 14) Bug Fix: • An empty clipboard could cause a crash on startup (iOS 14) 3.1.1 04/15/2021 • Key flashing may be turned off and on: - Select desired mode in "Settings" or: - Store 19390101 in M (STO M) or R1 (STO 1) to turn off - Recall 19390101 from M (M) or R1 (STO.1) to turn on (Hewlett-Packard Company was founded an Jan 1, 1939) Bug Fixes: • Registers in portrait mode didn't show correctly in Dark Mode • Using scientific notation could crash the app in some regions, e.g. Australia, Sweden, Slovenia. 3.1 04/01/2020 • Support for iOS 13 RPN-70 HD now requires iOS 11 or later. 3.0 01/24/2020 • The register window now shows selected input parameters (n,i,PMT,PV,FV) in green • Changed "Undo digit" sound to same as found in other CuVee calculators • Tapping the register view in portrait mode reveals registers 0 to 9 • Many under-the-hood refinements 2.7 01/10/2019 • Entering very large numbers automatically shows exponent 2.6 05/04/2017 This update requires iOS 8 or later. • Calculator sounds mix with background audio and have their own volume control Bug fixes: • Fixed a possible crash on startup 2.5 10/02/2016 • Decimal addition/subtraction for higher precision 2.4 07/27/2016 • If audio is playing on start-up, RPN-67 will not produce any sounds 2.2 09/02/2015 • HP-70 low-battery warning (all decimal points lit) if iPad's battery drops below 5% • Improved sound volume control • 64-bit support 2.1 02/17/2015 • Landscape mode (finally...) • 10 optional non-volatile memory registers • Name change to better match the iPhone version (RPN-70 SD) 2.0 11/26/2013 • Full-screen display • Compatible with iOS 7 • Requires iOS 5.1 or later Bug fixes: • Fixed pasting values dropping decimal point in certain regions 1.1 09/14/2013 • Improved keyboard response - no more missed keys • Selectable keyclick volume (off/soft/loud) Note that the volume is also affected by the device settings ("Settings - General - Sounds - Ringer and Alerts"). 1.0.3 06/11/2012 • While entering a number, the X register of the stack display reflects the main display • Improved responsiveness of keyboard • Tapping the display shows registers or turns the calculator on • Tapping the register display hides it • Triple-tapping the display turns the calculator off • Support for Retina display 1.0.2 05/18/2012 1.0.1 05/17/2011
Previous Versions
Here you can find the changelog of RPN-70 HD since it was posted on our website on 2023-06-27 23:54:41.
The latest version is 3.4 and it was updated on 2026-06-23 16:56:34. See below the changes in each version.
RPN-70 HD version 3.4
Updated At: 2026-06-02
Changes: Version History • All registers are now non-volatile.
• Double-tapping the display acts like the View/Registers button (bottom-right).
• Triple-tapping the display:
- Clears registers R0..R9 (only if enabled in Settings).
- Resets the register K to 12. 3.4 07/28/2025 • Faster startup – no delay until the first button press is recognized after switching on. 3.3 05/09/2025 • RPN-70 HD runs on Apple Silicon Macs (see notes on homepage cuveesoft.ch).
• Disabled low-battery indicator (all decimal points lit) when running on Apple Silicon Mac.
• RPN-70 HD requires iOS 12 or later. 3.2 11/07/2024 • iPadOS 16 compatibility 3.1.5 11/09/2022 • iPad mini (2021) compatibility 3.1.2 10/03/2021 • Suppressed clipboard notification on each keypress (iOS 14)
Bug Fix:
• An empty clipboard could cause a crash on startup (iOS 14) 3.1.1 04/15/2021 • Key flashing may be turned off and on:
- Select desired mode in "Settings"
or:
- Store 19390101 in M (STO M) or R1 (STO 1) to turn off
- Recall 19390101 from M (M) or R1 (STO.1) to turn on
(Hewlett-Packard Company was founded an Jan 1, 1939)
Bug Fixes:
• Registers in portrait mode didn't show correctly in Dark Mode
• Using scientific notation could crash the app in some regions, e.g. Australia, Sweden, Slovenia. 3.1 04/01/2020 • Support for iOS 13
RPN-70 HD now requires iOS 11 or later. 3.0 01/24/2020 • The register window now shows selected input parameters (n,i,PMT,PV,FV) in green
• Changed "Undo digit" sound to same as found in other CuVee calculators
• Tapping the register view in portrait mode reveals registers 0 to 9
• Many under-the-hood refinements 2.7 01/10/2019 • Entering very large numbers automatically shows exponent 2.6 05/04/2017 This update requires iOS 8 or later.
• Calculator sounds mix with background audio and have their own volume control
Bug fixes:
• Fixed a possible crash on startup 2.5 10/02/2016 • Decimal addition/subtraction for higher precision 2.4 07/27/2016 • If audio is playing on start-up, RPN-67 will not produce any sounds 2.2 09/02/2015 • HP-70 low-battery warning (all decimal points lit) if iPad's battery drops below 5%
• Improved sound volume control
• 64-bit support 2.1 02/17/2015 • Landscape mode (finally...)
• 10 optional non-volatile memory registers
• Name change to better match the iPhone version (RPN-70 SD) 2.0 11/26/2013 • Full-screen display
• Compatible with iOS 7
• Requires iOS 5.1 or later
Bug fixes:
• Fixed pasting values dropping decimal point in certain regions 1.1 09/14/2013 • Improved keyboard response - no more missed keys
• Selectable keyclick volume (off/soft/loud)
Note that the volume is also affected by the device settings ("Settings - General - Sounds - Ringer and Alerts"). 1.0.3 06/11/2012 • While entering a number, the X register of the stack display reflects the main display
• Improved responsiveness of keyboard
• Tapping the display shows registers or turns the calculator on
• Tapping the register display hides it
• Triple-tapping the display turns the calculator off
• Support for Retina display 1.0.2 05/18/2012 1.0.1 05/17/2011
RPN-70 HD version 3.4
Updated At: 2025-07-28
Changes: Jul 28, 2025
Version 3.4
• All registers are now non-volatile.
• Double-tapping the display acts like the View/Registers button (bottom-right).
• Triple-tapping the display:
- Clears registers R0..R9 (only if enabled in Settings).
- Resets the register K to 12.
RPN-70 HD version 3.4
Updated At: 2025-07-28
Changes: • All registers are now non-volatile.
• Double-tapping the display acts like the View/Registers button (bottom-right).
• Triple-tapping the display:
- Clears registers R0..R9 (only if enabled in Settings).
- Resets the register K to 12.
RPN-70 HD version 3.3
Updated At: 2025-05-09
Changes: May 9, 2025
Version 3.3
• Faster startup – no delay until the first button press is recognized after switching on.
RPN-70 HD version 3.2
Updated At: 2024-11-07
Changes: Nov 7, 2024
Version 3.2
• RPN-70 HD runs on Apple Silicon Macs (see notes on homepage cuveesoft.ch).
• Disabled low-battery indicator (all decimal points lit) when running on Apple Silicon Mac.
• RPN-70 HD requires iOS 12 or later.
RPN-70 HD version 3.1.5
Updated At: 2022-11-09
Changes: Nov 9, 2022
Version 3.1.5
• iPadOS 16 compatibility
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