What's new in Free42 2.2.1b

Made the app explicitly single-instance (by adding launchMode="singleInstance" to Free42Activity in the app manifest). This should eliminate the remaining null-pointer crashes in the native code, and also prevent State File Corrupt scenarios.

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About Free42 2.2.1b

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.

Download Free42 2.2.1b

This release may come in several variants. Consult our handy FAQ to see which download is right for you.

Variant
Arch
Version
DPI
2.2.1b APK
97
May 20, 2019
arm64-v8a + armeabi
Android 2.2+
nodpi
All Releases
Free42 3.3.9a
October 21, 2025

Version:3.3.9a

Uploaded:October 21, 2025 at 3:48PM UTC

File size:1.59 MB

Downloads:6

Free42 3.3.9
October 16, 2025

Version:3.3.9

Uploaded:October 16, 2025 at 4:06PM UTC

File size:0.93 MB

Downloads:0

Free42 3.3.8f
October 10, 2025

Version:3.3.8f

Uploaded:October 10, 2025 at 5:19PM UTC

File size:0.93 MB

Downloads:6

Free42 3.3.8e
September 28, 2025

Version:3.3.8e

Uploaded:September 28, 2025 at 12:30AM UTC

File size:1.59 MB

Downloads:9

Free42 3.3.8d
September 27, 2025

Version:3.3.8d

Uploaded:September 27, 2025 at 8:18PM UTC

File size:0.93 MB

Downloads:1

Free42 3.3.8c
July 19, 2025

Version:3.3.8c

Uploaded:July 19, 2025 at 12:26PM UTC

File size:1.59 MB

Downloads:24

Free42 3.3.8a
July 4, 2025

Version:3.3.8a

Uploaded:July 4, 2025 at 5:12PM UTC

File size:1.59 MB

Downloads:22

Free42 3.3.8
July 3, 2025

Version:3.3.8

Uploaded:July 3, 2025 at 9:49AM UTC

File size:1.59 MB

Downloads:13

Free42 3.3.7
June 29, 2025

Version:3.3.7

Uploaded:June 29, 2025 at 9:03PM UTC

File size:1.59 MB

Downloads:8

Free42 3.3.6a
June 10, 2025

Version:3.3.6a

Uploaded:June 10, 2025 at 7:54PM UTC

File size:1.59 MB

Downloads:9

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