Caluwin

Calculation of Uw-values according to DIN EN ISO 10077-1

Sommer Informatik GmbH · de.sommerinformatik.Caluwin

Not rated yet 1K+ downloads v0.134.66 7.6 MB Android 4.1+ PEGI 3 · Everyone

Download APK 7.6 MB All versions

Signature matches the Google Play version Details

At a glance

Latest version: v0.134.66 (29)
Updated: Jan 18, 2026 (9 months ago)
APK size: 7.6 MB
Requires: Android 4.1+ (API 16)
CPU support: Any (no native code)
Category: Tools (app)
Listed since: Oct 30, 2020 (at least)
Permissions: 2 (1 sensitive)
Website: sommer-informatik.de
Developer contact: [email protected]
Privacy: Developer's privacy policy

About this APK

Caluwin is an app by Sommer Informatik GmbH in the Tools category, listed since at least October 2020. It has no native code, so it runs on any Android processor.

It asks for 2 permissions, 1 of them sensitive: modify shared storage. It asks for the same permissions as version 0.134.65.

What's new in v0.134.66

Address of Swisspacer and BAUWERK updated

Description

From the listing uploaded by “appupdater”.

Caluwin is an app for calculating U-values of windows according to DIN EN ISO 10077 and DIN EN13947. Features: - Uw-values of windows according to DIN EN ISO 10077-1 - Condensation calculator - Surface temperatures and condensation risk in the glass edge area - Window Energy Savings Winter - Window Energy Savings Summer - Window Energy Savings Winter + Summer - Window Energy Ratings Switzerland, Denmark, France, UK - Passive House Efficiency - SWS Air Simulation (lifetime, elevated transport)

Version history

3 versions are listed, going back to v0.134.64.

v0.134.66 LATEST Jan 18, 2026 7.6 MB TRUSTED v0.134.65 Sep 20, 2024 7.6 MB TRUSTED v0.134.64 Jun 7, 2024 7.6 MB TRUSTED

All 3 versions

Security & authenticity

Security rating: Trusted

Signing certificate

Signature matches the Google Play version Checked by the source store on Jan 18, 2026.
Certificate issued to “Sommer Informatik GmbH” This is the certificate of the Google Play version.
Same certificate as the 2 other versions checked

Store checks and file details

Developer signature verified Jan 18, 2026
Validated against Google Play Jan 18, 2026
Signed byO=Sommer Informatik GmbH, L=Rosenheim
Signing certificate (SHA-1)56:C5:9E:DF:42:23:FE:BF:53:83:9A:81:13:6E:B2:CE:AF:B1:E0:15
File MD5542b0316ea9ce88df77e536a01f1d95c
Uploaded by “appupdater” Gold tier · 117,810 followers · uploading since 2020

Scans and ratings come from the source store; the certificate comparisons are AAPKs's own, made from the files' published signatures (2 other versions compared). AAPKs doesn't scan files itself — compare the MD5 and signer after downloading.

Permissions (2)

Caluwin requests 2 permissions, 1 of them sensitive.

Modify shared storage Sensitive android.permission.WRITE_EXTERNAL_STORAGE
Full network access android.permission.INTERNET

Required hardware & features

Basic touch input android.hardware.faketouch

Caluwin APK: questions and answers

Can I install this APK over the version I already have?

Yes, if your installed copy is older. It is signed like the Google Play version, so Android installs it as an update and keeps your data.

Is the Caluwin APK safe?

No one can promise that a file is safe, but some things can be checked. The source store rates this file Trusted. Its signature matches the Google Play version. It is signed with the same certificate as the 2 other versions checked. After downloading, check that the file's MD5 is 542b0316ea9ce88df77e536a01f1d95c.