SpectralBench Review: What It Does Well and Where It Falls Short

What SpectralBench Is

SpectralBench is a spectroscopy workbench. You open it in a web browser, drop in a spectrum file, and view, process, and analyze the data without installing anything. It covers FTIR, Raman, NIR, UV-Vis, fluorescence, and mass spectrometry data, and it pairs the workbench with a searchable library of reference spectra.

This SpectralBench review looks at what the platform offers today, what it is missing, and which labs it suits. We rate it 8.0 out of 10, the same score it receives in our ranking of free FTIR and spectroscopy software.

Availability and Price

SpectralBench runs in a web browser at spectralbench.com. The reference spectrum library is public and can be browsed without an account.

SpectralBench is free. It plans paid tiers, but no prices have been announced, so we cannot yet say which features will stay free. We will update this review when pricing is published.

File Format Support

Format support is SpectralBench's strongest point. It reads about 30 formats directly and detects the format automatically when you drop a file in. Most free web tools stop at JCAMP-DX and CSV; SpectralBench also opens the proprietary binary files that instruments write, so you do not need the vendor's software to export them first.

Two limits apply. Thermo Fisher SPG group files open only their first spectrum. And without an account, files are capped at 4 MB; a free account raises the limit to 100 MB per file. Large Raman maps and long time series can exceed the 4 MB limit.

Analysis Features

Preprocessing. Baseline correction offers four methods (asymmetric least squares, polynomial, SNIP, and rubberband). There is Savitzky-Golay smoothing, three normalization modes (min-max, vector, and maximum peak), first and second derivatives, spike removal, and ATR correction for diamond, germanium, ZnSe, and silicon crystals. The controls respond immediately as you move the sliders.

Curve fitting and PCA. Curve fitting supports Gaussian, Lorentzian, and pseudo-Voigt peak shapes. Principal component analysis (PCA) groups a set of spectra by their main sources of variation, which is useful for sorting samples or spotting outliers. These two features are where SpectralBench pulls ahead of other free web tools; Open Specy and Essential FTIR offer neither.

Comparison and spectral math. You can overlay or stack several spectra, and subtract, average, or ratio them.

AI interpretation. An AI interpreter suggests functional groups and possible compounds for an uploaded spectrum. It runs on general-purpose language models from Google and OpenAI rather than a model trained only on spectra, so treat its output as a starting point and confirm assignments against reference data.

Export. Processed data exports as CSV, JCAMP-DX, SPC, or MATLAB files, and the file converter can convert a batch of files and download them as one ZIP. Figures export as PNG, SVG, PDF, or TIFF, with size presets for ACS, Nature, RSC, Wiley, and Elsevier journals. All of this is currently free; SpectralBench's planned pricing moves TIFF export and the RSC, Wiley and Elsevier presets to paid tiers and limits free PCA to 5 spectra and curve fitting to 3 peaks.

Reference Library

The library holds more than 50,000 reference spectra drawn from open-access sources, covering minerals, polymers, organics, soils, and other categories across FTIR, Raman, NIR, UV-Vis, fluorescence, and mass spectrometry. You can search by compound name, formula, or CAS number, or match an uploaded spectrum against the library. SpectralBench also publishes a curated subset of the library on Zenodo with a DOI, so a dataset used in a paper can be cited.

The library is large for a free tool but small next to the commercial libraries sold with OPUS and OMNIC, which run to hundreds of thousands of spectra. When you are signed out, reference spectra are shown at reduced resolution (250 points); full-resolution reference data in match overlays requires an account.

Where It Falls Short

• No offline mode. Files are uploaded to and read on SpectralBench's servers. Field work without a connection, air-gapped lab computers, and confidential samples that cannot leave the building rule it out.
• File size limits. 4 MB without an account and 100 MB with a free one. Desktop tools have no such limit.
• No NMR or XRD. NMR users need MestReNova or a similar tool.
• Not for regulated labs. SpectralBench's disclaimer rules out regulatory submissions, GLP/GMP testing, and work that requires 21 CFR Part 11 validation.
• English-only workbench. The home page is available in 9 languages, but the workbench and most other pages are in English.
• Short track record. SpectralBench is new and has few citations in published research, which matters to reviewers who expect established software in a methods section.

Pros and Cons

How SpectralBench Compares

Scores are the same ones we use across SpectraComp, highest first.

Against Spectragryph, SpectralBench trades offline speed and NMR/XRD support for active development, PCA, and no installation. Our Spectragryph alternative guide compares the two feature by feature. Against OPUS and OMNIC, it lacks instrument control, validated workflows, and large commercial libraries, but it costs nothing and reads both vendors' files. The spectroscopy software comparison matrix lets you filter all of these tools by technique, platform, and price.

Who Should Use It

• Good fit: academic labs and students without a software budget, multi-instrument facilities that need to open files from several vendors, and anyone on macOS, Linux, or a Chromebook who cannot run Windows-only tools.
• Poor fit: GMP/GLP and other regulated labs, sites without reliable internet, labs whose data cannot leave their network, and NMR groups.

Frequently Asked Questions