# Vintage-45 — Vintage Calculator (1973)

> A faithful digital simulation of the 1973 Hewlett-Packard HP-45 scientific calculator. (iPhone/iPad app by CuVee Software.)

- Source: https://appshunter.io/ios/app/vintage-45/id506402272 (this page in markdown: same URL + `.md`)
- Developer: [CuVee Software](https://appshunter.io/developer/424873503)
- Category: Productivity, Utilities
- Price: $0.99
- Rating: 4.80/5 from 19 App Store ratings · 13 written reviews indexed
- Age rating: 4+
- Requires: iOS 12.0 · 17 MB
- Languages: American English, French (France), German (Germany)
- Released: 2012-03-06
- Data updated: 2026-08-26
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/vintage-45/id506402272/reviews.md

## What is Vintage?

Vintage-45 is a complete simulation of Hewlett-Packard's scientific hand-held calculator HP-45 from 1973. Processing times and behavior have been carefully modelled after the original. Even the "secret" stopwatch may be activated.

Features:

• 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
• Includes "secret" stopwatch
• Full-speed or simulated speed of real calculator
• Correct wrong number entries by swiping left across the display
• Cut/copy/paste display value
• Tap display to show stack and all memory registers
• Additional conversions (optional): Celsius vs. Fahrenheit, liters per 100km vs. mpg (US and UK), m/ft, g/oz, g/ozt

Double-tap the display for some basic hints.

For more information and a short manual visit the homepage: cuveesoft.ch

## Key features

- Photo-realistic HP-45 design
- Animated keys with sound feedback
- Full HP-45 function implementation
- Includes "secret" stopwatch
- Simulated or full-speed operation
- Cut/copy/paste display value
- Display stack and memory register view

## Recent user reviews (10 of 13)

All indexed reviews: https://appshunter.io/ios/app/vintage-45/id506402272/reviews.md

### 5/5 — Der schönste

*2025-05-15*

Danke für das schnelle Einschalten ! - ja damals war er mit 1000.- DM unerreichbar für einen Schüler ... und heute als App wunderbar

### 5/5 — Extremely well done simulation

*2022-02-12*

Until I purchased Vintage-45 I always preferred a physical calculator to any iPhone calculator app.  I own several physical HP models (HP 55, 11C, 12C, 35S, 48G), with the HP 55 (still working after 45 years!) being my favorite until now.  

Vintage-45 is about as perfect a simulation of an HP 45 as you’re going to find.  Most of the differences are actually improvements over the original - smaller, lighter, faster (if you enable high speed mode), greater accuracy, and much better battery life than the original.  The lack of physical keys has not been an issue at all, which was something of a surprise to me.  Kudos to HP for a keyboard design so good that it even works on a flat screen!

My only complaint is with the original HP 45 itself, not the simulation.  HP hadn’t quite worked out how to manage the display, and decided to display small numbers (smaller than the display mode allows) simply as 0 when in fixed point mode.  As a result you get weird effects like -1.2345E-20 displayed in FIX mode as -0.00.  Of course you can always switch to SCI and see the true number.  Once you understand what’s going on it makes sense but it’s confusing at first.

Later HP calculators fixed this issue (nonzero numbers too small for fixed point automatically display in scientific notation, a much more intuitive way of doing it).  But it’s interesting to see how the HP 45 approached the issue and the associated pitfalls.

I considered the -SD version of this app but I think it’s way overdone (though I admit I haven’t tried it).  The Vintage-45 version is just right in my opinion, and I usually reach for it now instead of the stalwart HP 55.  Bravo Cuveesoft for a job well done!

### 5/5 — Great product BUT

*2021-11-23*

This is s great simulation of my favorite calculator (still have working unit in plastic box with manual and charger)

BUT the touchscreen stopped working on my 13 Pro Max when I upgraded to v 15.1.1 today! Have rebooted to no avail.

Hope you check this out!

### 5/5 — HP45 Resurrected

*2021-10-15*

This was the most amazing calculator available in its day at a staggering $400! This app is so exact that my heart rate goes up whenever I fire it up.  Such wonderful memories, complete with the red led display and the great sound.

### 5/5 — Love this emulation

*2021-05-12*

When I was going to school I could not afford the HP-45’s I had to soldier on using an HP-35.  I was able to borrow them on occasion.  This emulation comes as close to the actual device as you are going to get.  In the larger iPhones it is even about the same size.  I still enjoy the look on peoples faces when I explain what RPN stands for.

### 5/5 — The best!

*2019-01-11*

And by the way, I love this app! I use it several times every day, it’s my only calculator except for a physical HP 12-C that lives in my briefcase and hardly ever gets used. I’ve been an HP fanboy since the 35, RPN is so pleasant to use. And having it on iOS is the best of both worlds.

### 5/5 — This is fun

*2015-10-24*

I have a little collection of HP calcs, all of which use RPN and I like this. It looks so nice on the screen and this is a simple one. I dearly wish the HP-67 app was available for the iPhone/iPod Touch, so I had to get the other 67 app from the competition! And that also is great. Thanks for creating this.

### 5/5 — Great!

*2015-03-22*

Wonderful app!  I would love an equally good HP-67 for iPhone. I have it for iPad, but not for my phone.

It would be nice if the volume adjustment stayed set rather than needing to be reset each time the app starts.

### 5/5 — Wonderful!

*2014-10-23*

I'vre been using a real HP-45 since 1973. When use it at my desk all the time, but I sure miss it on the road. Problem solved, thanks to Willy Kunz. Great job!

### 5/5 — Great App!

*2013-04-30*

My favorite calculator app for iPhone. Love it!

## Frequently asked questions about Vintage

### What is Vintage-45?

Vintage-45 is a complete simulation of the Hewlett-Packard HP-45 scientific hand-held calculator from 1973. It aims to replicate the original's processing times and behavior with a photo-realistic look and animated keys.

### Does Vintage-45 have ads?

No, Vintage-45 does not contain advertisements. It is a paid application with no ads present.

### What devices does Vintage-45 support?

Vintage-45 is supported on iPhone and iPod devices. It is designed for iOS platforms.

### How accurate is Vintage-45 compared to the original HP-45?

The app's processing times and behavior have been carefully modeled after the original HP-45. Users can choose between full-speed operation or a simulated speed that matches the real calculator.

### Can I correct mistakes in Vintage-45?

Yes, you can correct wrong number entries by swiping left across the display. The app also allows you to cut and paste the display value.

### What is the age rating for Vintage-45?

Vintage-45 has an age rating of 4+. This indicates it is suitable for users of all ages, with no mature content.

### How often is Vintage-45 updated?

The latest version of Vintage-45 is 3.3, last updated on March 9, 2026. This indicates a history of updates, though the last update date appears to be in the future.

### What are the additional conversions available in Vintage-45?

Optional additional conversions include Celsius vs. Fahrenheit, liters per 100km vs. mpg (US and UK), meters per foot, and grams per ounce/troy ounce.

## Version history (last 5 releases)

### 3.3 — 2026-03-09

• Improved compatibility with real HP-45 when using D.MS conversions:

– With "Extras" set to off (yellow key, then "+" key to toggle): same results as real HP-45
– With "Extras" set to on: improved results (no digits dropped by conversion)


EXAMPLE

Convert 12.345612:

– "Extras" off: D.MS-> 12.58225556, then ->D.MS back to 12.34560000
– "Extras" on:  D.MS-> 12.58225556, then ->D.MS back to 12.34561200

### 3.2 — 2025-10-16

• Localized decimal point and separator appear only when “Extras” is activated.
• Improved compatibility with iPhone Air and iOS 26.

### 3.1 — 2025-07-28

When “Extras” are turned on ("Gold"-"+"), stack and registers are non-volatile.

### 3.0 — 2025-05-30

When “Extras” are turned on, you can switch between grams/ounce and grams/troy ounce using gold-“x”.

### 2.9 — 2025-05-10

• Faster startup – no delay until the first button press is recognized after switching on.

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## More apps by CuVee Software

- [RPN-45 HD](https://appshunter.io/ios/app/rpn-45-hd/id424873500)
- [RPN-70 HD](https://appshunter.io/ios/app/rpn-70-hd/id436127144)
- [Smart Sudoku](https://appshunter.io/ios/app/smart-sudoku/id457564906)
- [RPN-45 SD](https://appshunter.io/ios/app/rpn-45-sd/id509923051)
- [RPN-67 NP](https://appshunter.io/ios/app/rpn-67-np/id603100249)

All apps by CuVee Software: https://appshunter.io/developer/424873503

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-26.*