Relux Logo ReluxDesktop – the new free approach to planning

ReluxDesktop is a high-performance, intuitively-operated application for simulating artificial light and daylight. It provides you with rapid and efficient support on all the different aspects of big and small projects, without taking any unnecessary roundabout routes.

Simulation of lighting and sensors in real time! Calculation of absolute values, national and international standards, compatible with CAD and BIM systems, plus a great deal more. The application is available to you free of charge thanks to the support of our partners in industry.

227,912 users are already working successfully with it.

Make ReluxDesktop your day-to-day tool – you'll be surprised how much time you save with it!


Supports the following standards:
EN12464-1 (2013)
EN1838 (2014)
ASR A3.4 (2011)
DIN 5034 (1999)


Supports the following standards:
EN12464-2 (2013)
EN 12193 (2008)
GR nach CIE 112 (1994)


Supports the following standards:
EN13201-2,-3 (2015)
SN13201-2,-3 (2016)

Select appropriate add-ons

ReluxCAD for Revit

Add-on for other programs
Useful functions for Autodesk Revit

ReluxCAD for AutoCAD

Add-on for other programs
Useful functions with an interface to ReluxDesktop.

ReluxCAD for TinLine Plan

Add-on for other programs
Useful functions with an interface to ReluxDesktop

ReluxEnergy CH

Add-on for ReluxDesktop & ReluxSuite
Minergie Suisse Standard to SIA 387/4 and SIA 380/4


Add-on for ReluxDesktop
Real tunnel calculation based on the current standards.


Additional function for ReluxDesktop
Evaluation of glare by obstrusive light

Online Help