Download Free42 APK
com.thomasokken.free42 · by Thomas Okken
Latest Version: 3.3.8e
• Updated: Dec 29, 2025
Download Free42 APK
v3.3.8e ·
APK
About Free42
Free42 is a re-implementation of the HP-42S calculator and the HP-82240 printer. It is a complete rewrite, not using any HP code, and it does not require an HP-42S ROM image. Free42 is an Open Source project. The executables and source code are released under the terms of the GNU General Public License, version 2. All third-party code used in Free42 is either in the public domain, or licensed under terms compatible with GPLv2, or used with the authors' permission.
Frequently Asked Questions
Yes. Every Free42 APK on APK.now is automatically scanned and the cryptographic signature is verified against the original publisher's certificate (Thomas Okken). Files that fail verification are removed before they ever reach the catalog.
Enable 'Install from unknown sources' for your browser (or the file manager you use to open the APK) under Settings → Apps → Special access. Tap the downloaded Free42 APK, confirm the prompts, and Android installs it just like any app from the Play Store.
The latest Free42 version available on APK.now is 3.3.8e. We track new releases from Thomas Okken continuously and add them to the catalog as soon as they pass verification.
Yes — every Free42 APK and every version on APK.now is free to download. We never gate downloads behind sign-up, surveys, or paywalls.
APK.now keeps a full archive of every Free42 release, including older versions that the Play Store has already replaced. The APKs work on devices without Google Play Services (Huawei, GrapheneOS, Amazon Fire) and are signature-verified so you can be confident the file is genuine.