# Caluwin

> Window U-value calculator based on DIN EN ISO standards. (iPhone/iPad app by Sommer Informatik GmbH.)

- Source: https://appshunter.io/ios/app/caluwin/id688220781 (this page in markdown: same URL + `.md`)
- Developer: [Sommer Informatik GmbH](https://appshunter.io/developer/634307623)
- Category: Utilities, Productivity
- Price: Free
- Age rating: 4+
- Requires: iOS 12.0 · 13 MB
- Languages: American English
- Released: 2013-09-10
- Data updated: 2026-07-04
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/caluwin/id688220781/reviews.md

## What is Caluwin?

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)

## Key features

- U-values according to DIN EN ISO 10077-1
- Condensation calculator
- Surface temperature analysis
- Window energy savings (winter/summer)
- Regional energy ratings (CH, DK, FR, UK)
- Passive House efficiency calculation

## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/caluwin/id688220781/reviews.md

### 5/5 — Ideal und Praxisnah

*2014-05-10, version 0.081*

Super Lösung für einen schnellen Vergleich verschiedener Systeme.

### 5/5 — Funktioniert auf iOS 6.1.4

*2013-09-13, version 0.068*

Getestet mit IPhone 5 und iOS 6.1.4
Funktioniert fehlerfrei.

## Frequently asked questions about Caluwin

### What is Caluwin used for?

Caluwin is used to calculate the U-values of windows according to DIN EN ISO 10077 and DIN EN13947 standards. It also provides condensation risk analysis and energy savings calculations for different seasons and regions.

### What standards does Caluwin follow?

Caluwin calculates U-values according to DIN EN ISO 10077-1 and DIN EN13947. It also offers energy ratings for Switzerland, Denmark, France, and the UK.

### Does Caluwin have ads?

No, Caluwin does not contain advertisements. It is a free application without any ads.

### What devices is Caluwin available on?

Caluwin is available on iPhone, iPad, and iPod. It is designed for Apple mobile devices.

### How often is Caluwin updated?

The latest version of Caluwin is 0.134.66, last updated on January 8, 2025. Updates are released periodically to maintain functionality and standards compliance.

### What is the age rating for Caluwin?

Caluwin has an age rating of 4+. This indicates it is suitable for users of all ages, with no mature content.

### Can Caluwin simulate air movement?

Yes, Caluwin includes SWS Air Simulation, which can be used for lifetime and elevated transport simulations related to air.

### What are the benefits of using Caluwin for energy savings?

Caluwin calculates Window Energy Savings for both winter and summer, and can also provide combined savings. It also offers Passive House Efficiency calculations.

## Version history (last 5 releases)

### 0.134.66 — 2025-01-08

Address of Swisspacer and BAUWERK updated

### 0.134.65 — 2024-09-18

New spacer "Swisspacer Ultimate Pro" added

### 0.134.64 — 2024-03-13

- Glass lists updated: Saint-Gobain and Pilkington (NSG Group)
- Logos updated
- At least iOS 12 required

### 0.134.61 — 2022-01-26

SWS Air Simulation: after the search of coordinates (Lifetime) the installation place is now also translated if one of the following languages is set:
- Chinese
- Czech
- English (UK)
- Japanese
- Korean
- Ukrainian

### 0.134.60 — 2021-08-05

Italian translation updated

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## More apps by Sommer Informatik GmbH

- [WinUw ROLLTECH](https://appshunter.io/ios/app/winuw-rolltech/id1058903835)
- [Trosifol - WinSLT](https://appshunter.io/ios/app/trosifol-winslt/id1325094120)
- [Capitol Talk](https://appshunter.io/ios/app/capitol-talk/id1345264951)
- [Trosifol - GlasGlobal](https://appshunter.io/ios/app/trosifol-glasglobal/id1371496052)
- [Alpina App](https://appshunter.io/ios/app/alpina-app/id1437246615)

All apps by Sommer Informatik GmbH: https://appshunter.io/developer/634307623

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-04.*