Programmer's calculator similar to an HP 16c.
About this app
Programmer's calculator based on Emmet Gray's WRPN 16c, which simulates an HP 16c. This is an RPN-based calculator that works in floating point, and integers expressed in hex, decimal, octal or binary. I modified Emmet's WRPN (with permission) so that it uses rendered fonts for the keys. This makes them look nice and crisp on high resolution displays.
I offer this software as-is, with no guarantee of any kind. The source is available on github. There's also a desktop Java version -- see https://jrpn.jovial.com/ for both.
Licensed under Apache-2.0, by Bill Foote.
What's New in v1.1.5
Imported from the F-Droid repository index.
Version history
Jul 22, 2021 · 1.7 MB · Android API 15–29 · code 9
Imported from the F-Droid repository index.
SHA-256 929a8fb1d0dc51979cab73e13708cb64d8a0b67c6176ed51c9452d294418ce54
Apr 5, 2021 · 1.7 MB · Android API 15–29 · code 8
Imported from the F-Droid repository index.
SHA-256 7cec68f0bbf35326932534ee1d2c3f3b422c1abb971d0115a7f098f2076a8527
Feb 21, 2021 · 1.7 MB · Android API 15–29 · code 7
Imported from the F-Droid repository index.
SHA-256 4ed2d673d92a9b0fad9a766513764ae6a36d3603ba28c82ff05f86027ec92720
Will it run on your device?
73%
- Runs on a broad range of modern Android versions.
- ABI coverage is focused on newer 64-bit devices.
Installation Guide
Open Settings on your Android device
Go to Security → Unknown sources (or Install unknown apps)
Enable "Allow from this source" for your browser or file manager
Open the downloaded APK file from your Downloads folder
Tap "Install" and wait for installation to complete
Launch the app from your home screen
Make sure to re-enable Unknown Sources restrictions after installation for security.
How to install this safely
How to verify the file you downloaded
Before you install anything, confirm the file is the one described here. On a computer, run shasum -a 256 your-download.apk (macOS or Linux) or certutil -hashfile your-download.apk SHA256 (Windows), then compare the output character-for-character with the SHA-256 on this page. If a single character differs, the file is not the build we recorded — delete it.
What the signing certificate proves
Every Android app is signed with a private key that only its developer holds. The fingerprint on this page is a hash of the matching public certificate, and it proves continuity rather than identity: it tells you a build came from whoever signed the earlier ones. Android enforces this at install time — if a package claiming to be com.jovial.jrpn is signed with a different key, the system will refuse to install it over your existing copy. A fingerprint that changes between releases is worth pausing on, because a repackaged app that has been modified by someone else cannot keep the original signature.
How to roll back to an earlier version
If the current release misbehaves, 1.1.4.2 is the last build before it. Android will not install an older version code over a newer one, so you must uninstall JRPN 16c first — which clears its local data unless you have a backup. Reinstall the older APK only if its signing fingerprint matches the build you already trust, and check the API range: an older release may target an Android version your device has moved past.
Why we list sources instead of hosting everything
The official store channel is almost always the right choice: it updates automatically and carries the publisher's own distribution guarantees. A direct APK is useful when a device has no store access, when a rollout has not reached your region, or when you need a specific version — and only when the publisher has authorized that copy. APKBrowse does not list pirated, cracked, or unauthorized rebuilds of JRPN 16c, and a listing is removed when the evidence for it stops holding up.
Get JRPN 16c
Every source we list for com.jovial.jrpn is legality-reviewed. Pirated or cracked builds are never offered.
Other sources
F-Droid listing
officialF-Droid builds this app from source and signs it. This is its official listing, with older builds and full release notes.
Source code
verified publisherThe upstream repository this build is compiled from.
We check legality and signature continuity, but device behaviour still varies. Install at your own discretion.
App Information
Security Verification
We record provenance; we do not run malware scans. Verify the hash yourself before installing.
SHA-256 Hash
929a8fb1d0dc51979cab73e13708cb64d8a0b67c6176ed51c9452d294418ce54
Signing certificate
13f05a582aa44085e763c3f37803afeb49526b8b313f573d296e2ccea04f2b1d
Previous Versions
The signing certificate fingerprint for this release is on record, so a build that does not match it did not come from this publisher.
Report a problem with this listing
A listing is only as good as its corrections. If a source is broken, a signature looks wrong, or this app should not be here, tell the moderation team.