Vintage-45

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!

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!

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.