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RelaxIS. Versatile software for analyses in electrochemical impedance spectroscopy

Get inspired by RelaxIS – our proven stand-alone software for analysing electrochemical impedance spectroscopy measurements. It is compatible with most major-brand analyser data formats. Optimised for working with many spectra at a time, RelaxIS’ analysis functions can be applied quickly to a full measurement series.

  • Compatible with practically all EIS analysers
  • Offers both common and advanced analysis techniques
  • Customisable in many areas with a powerful plug-in system
  • Available for Microsoft Windows 10 / 11

 

Your advantages using RelaxIS

  • Save valuable time by quickly importing data without prior export
  • Fully customisable, publication-ready plots
  • Practical Auto-Fit function to get great fits without much hassle
  • Outstanding DRT calculation and DRT visualisation features
  • The full analysis workflow of import, analysis, results investigation and export – combined in one software
  • Extensive customisability via RelaxIS 3 plug-ins

 

Selected RelaxIS 3 highlights

Powerful Auto-Fit

With the Auto-Fit function, you can fit any model to a spectrum – in seconds and without parameter initialisation. A true one-click fit!

Easy data import

RelaxIS supports many file formats produced by various analyser manufacturers. So you can import your files directly without the need for a prior text export.

Also benefit from customisable text file import to load multiple spectra simultaneously from one file – including metadata like temperature or voltage if available.

Flexible data visualization

The visualisation of impedance spectra is an important, but often overlooked aspect of data analysis. RelaxIS offers a multitude of ways to look at your data, i.e. freely customisable Nyquist- or Bode-, overlay- and 3D-plots. You can even use live-analysis views like DRT or KK that shows quick calculations while browsing the data.

You don’t just measure one spectrum, right?

RelaxIS is based on the idea of handling large measurement series. This means that you can analyse many spectra in batches – be it with fitting, DRT calculation or exports. Also further analyses of measurement series are possible, e.g. by Arrhenius-Fits directly in RelaxIS.

Outstanding DRT calculation features

RelaxIS can calculate the distribution functions of time constants (DRT) for your spectra. Multiple spectra can be selected at a time for batch processing. In the DRTs you can perform peak-picking and integration and export these results for further use.

Test RelaxIS with a free and non-binding 14-day trial version!

Selected views and impressions

Product flyer

Check out the latest product flyer for the RelaxIS 3 software – the first choice for impedance spectrum analyses.

Download the latest RelaxIS 3 installer

SHA256: 6DDB2319DD63A7AC5B31A7C6317B920CC6E9CF8673DE805A7964D8E78948941B

Please note: When updating to v3.0.23, some plugin types may need to be updated manually.
Please refer to: https://docs.rhd-instruments.de/relaxis/relaxis_sdk/

  • Battery research
  • Corrosion studies
  • Conductivity measurements (i.e. MacMullin)
  • Studies on supercapacitors/ double-layer capacitance
  • Dye-sensitised solar cells
  • Electrochemical kinetics
  • General electrochemistry research
  • Article No. 840311
  • Included software: RelaxIS 3, Circuit Simulator, RelaxIS SDK
  • Software support included
  • Application support: Not included
  • Operating System: Windows 10, 11
  • License type: Floating license, lifetime or time-limited
  • License System: Offline (USB Dongle), online (account-based)

 

The RelaxIS Online DRT Tools has moved to a new home!

Available license models

RelaxIS 3 Permanent

  • A permanent license for RelaxIS 3 for 1 concurrent user. No limit to the number of PCs that may install the software.
  • Includes updates and support for RelaxIS 3. Does not include an upgrade to RelaxIS 4 (if released, which is not currently planned).
  • Licensing is provided either via hardware dongle (Wibu Codemeter), or online access. With the dongle, no internet or network access is required. The dongle can be shared in the local network. For online access, a permanent internet connection is required.

RelaxIS Time Limited

  • A time-limited license for RelaxIS 3 for 1 concurrent user. No limit to the number of PCs that may install the software.
  • License can be purchased for a specified number of months. Does not automatically renew, i.e. not a subscription model.
  • Includes updates and support. Can be converted to a license for RelaxIS 4 (if released, which is not currently planned).
  • Licensing is provided either via hardware dongle (Wibu Codemeter), or online access. With the dongle, no internet or network access is required. The dongle can be shared in the local network. For online access, a permanent internet connection is required.

What our customers & partners say

With RelaxIS, I can fit my impedance spectra and extract conductivity values within minutes instead of hours which was the case with another fitting software.

Dr. T. Goulas | Loughborough University

I think Relaxis is the most advanced software for EIS fitting I have ever worked with, and it definitely surpasses everything else I am familiar with.

Vladimir Yufit | Co-Founder, Chief Science & Innovation Officer, Addionics

RelaxIS was extremely helpful in my research. I will definitely use it again in the future when I need to analyze EIS data.

Tae H. Cho | University of Michigan

Its ease of use is amazing. I wanted to simulate the performance of some gold-plated electrodes modified with probes and aptamers using various circuits and got it done within 15 min – from start to finish. The options available include almost all known scenarios that could affect the performance. All I can say is WOW! Thank you for such a wonderful product.

Prof. Dr. Syed Hashsham | Michigan State University

Once you have used RelaxIS, everything else is always a downgrade.

Dr. S. P. Emge | Cambridge University, UK

RelaxIS is a rich software suite that combines many tools used for the evaluation of spectra measured in impedance spectroscopy experiments.

Y. Zhang, J. Zhang | From the collection “Progress in Polymer Applications”

Moving forward, this is the only software I would want to use.

R. Faase | Modern Electron, Inc.

RelaxIS has been invaluable.

R. Chukwu | University of Bremen

With RelaxIS, I can fit my impedance spectra and extract conductivity values within minutes instead of hours which was the case with another fitting software.

Dr. T. Goulas | Loughborough University

I think Relaxis is the most advanced software for EIS fitting I have ever worked with, and it definitely surpasses everything else I am familiar with.

Vladimir Yufit | Co-Founder, Chief Science & Innovation Officer, Addionics

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