app.speqqle is spectroscopic analysis made easy
For engineers, researchers & manufacturers using optical spectroscopy
Enhance your analysis capabilities without being a spectroscopy expert
Get precise & complete information from your data
Optical spectroscopy
You are using one or several optical spectroscopy techniques (see list here)?
What is standing between you and fast & accurate results?
Trapped in setup mode
You spend more time on setup, coding workarounds and configuration of your software than the actual analysis?
Process control & industrial research
You need to get precise information quickly from your data without having an in-house expert?
Still calibrating
You spend too much time and money on calibrating your software before getting the result?
Academic research
You want to analyze complex materials and optical excitations and need a scientifically trusted solution?
Lost in the spectrum
You are a beginner in spectroscopy analysis and feel overwhelmed by its complexity?
Discover app.speqqle
The easier way to analyse your spectroscopic data!
All optical spectroscopies combined in one platform
Start analyzing today
app.speqqle is ready for use - fully optimized & tested with zero programming required. You can focus on the result, not the setup.
The new expert on your team
app.speqqle puts advanced spectroscopy know-how and capabilities in your hands. No need to hire experts.
Calibration-free
app.speqqle is analysis based on physical modelling and does not require any calibration.
Developed & tested by scientists
app.speqqle is based on the RefFIT algorithm developed by spectroscopists and validated in 800+ publications.
No PhD? No problem!
app.speqqle is like physicist in a box. We teach you what you need to know in our manual and tutorials.
For all operating systems
app.speqqle is a web application and independent of your operating system. Contact us for a standalone version.
Hardware independent
app.speqqle is independent of the spectrometer you use for your experiments.
Spectroscopic data analysis with app.speqqle is based on exact physical models and does not require any calibration
Analyse your spectroscopic data with app.speqqle in three steps!
STEP 1 - Setup
STEP 2 - Fit
Fit your data to the experimental models using our fast & easy-to-use optimized Levenberg Marquardt algorithm
STEP 3 - Result
Multilayer samples
layer thickness
Near Field Spectroscopy SNOM
Variational dielectric function
Optical penetration depth
ellipsometry
Thin films
Dielectric constant
Differential Lorentz line shape
Drude-Lorentz line shape
Optical spectral weight
Cauchy line shape
Fano line shape
refractive index
reflectivity
app.speqqle is the Swiss army knife for your spectroscopy analysis - packed with functionalities
Kramers Kronig Analysis
line shapes
Optical conductivity
Gapped Drude line shape
STEP 1 - Setup
transmission
Contact-less temperature sensing
Measure the temperature of your sample or process directly from Raman signal.
Complex multilayer systems
Determine thickness and layer properties of multilayer stacks.
Monitor precisely the thickness of coatings and thin films from ellipsometry, reflectivity and transmission data to assure production quality.
Quality control of semiconducting & photonic chips
Control sheet resistance and refractive indices of functional single or multilayers for high performance chips and sensors.
Gas analysis
Determine gas concentrations from absorption measurements without the usual calibration process.
Phonon spectra of materials
Measure the lattice vibration modes of your material from reflectivity, transmission or Raman spectra.
app.speqqle is used for applications in process control, industrial & academic research
Thin film metrology
What our users say about app.speqqle
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“This software has transformed my optical fitting and analysis process. We used the software for the fitting of far-field and near-field optical spectra for our work in Nature Communications Xu et al. 15, 8562 (2024). Its user-friendly interface makes complex procedures straightforward, and the accuracy of the results is outstanding. It has significantly improved my efficiency in my research about optical materials”
Yin Liu, Assistant Professor,
North Carolina State University
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“As a researcher working with various spectroscopic techniques, I really appreciate app.speqqle's user-friendly interface and powerful functionalities. It provides the flexibility to efficiently analyze multiple and different sets of spectral data simultaneously. Additionally, its robust, fast, and convenient Kramers-Kronig-constrained variational fitting enables direct comparison with theoretical models, allowing iterative model refinement.”
Javier Taboada Gutierrez, Researcher
University of Geneva
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“With its powerful ability of far-field spectrum fitting, app.speqqle makes a key connection between the far-field and near-field optical spectra. This integration greatly accelerates near-field optical spectroscopic analysis.”
Wei Wei Luo, Associate Professor
Nankai University
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"Through the optical platform of the Laboratory of Advanced Technology (LTA), we provide optical spectroscopy measurement services to both academic partners and private companies. The number and wide variety of projects require highly efficient data analysis to deliver reliable results. app.speqqle enables fast and simultaneous analysis of data from a broad range of experimental techniques, all based on physical models that are more straightforward to interpret. A great tool for a daily use!"
Jérémie Teyssier, Researcher
Laboratory of Advanced Technology
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“I use app.speqqle to fit the absorbance spectrum of a coating to extract the refractive index. During the analysis, I encountered some problems and the team of app.speqqle helped me patiently to solve them. I am still learning about the theoretical basics of spectroscopy. The interface of app.speqqle is simple and clear and its operation intuitive, which helps beginners to get started quickly. In my future work, I will recommend app.speqqle to researchers with the same needs as me.”
Daisy, Student
Central South University China
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" I'm so glad I discovered app.speqqle during my PhD thesis because it truly transformed my analysis process. It was far more user-friendly compared to the Kramers-Kronig codes written from scratch. By applying the model I used on my data to the tabulated data outside the energy region of my experiment, I was able to obtain more accurate Kramers-Kronig transformations. The ability to apply a single model to multiple datasets and use a loop to fit a series of them was incredibly useful. I especially appreciated being able to view and adjust parameters in real time while watching the fit converge. This feature made the entire process much more efficient and intuitive. Additionally, the app.speqqle team (Iris in particular) have been so helpful in providing useful pieces of advice on how to take advantage of particular features of app.speqqle"
Amina Alic, PhD Student
Université Sorbonne Paris Nord
Beta testers of app.speqqle come from the following institutions
Contact us
Questions? Feedback? Need for a custom solution?
Our mission is simple: your success. Tell us what you are working on, what challenges you are facing and what features would make your analysis even better. We’re here to build the tools you need!