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Open-source tools for computational chemistry, MIT licensed

Research tools that run in your browser.

Digitize plots, run statistics, fit curves, build figures, convert units, view molecules and format LaTeX and BibTeX: 21 tools, nothing uploaded, no account.

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Your data never leaves the browser.

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Every utility, no paywalls.

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Data Processing & Statistics

Popular

Plot Digitizer

Extract data points from a graph image by clicking or tracing curves, then export the numbers as CSV.

Data Cleaner

Clean, normalize, and log-transform messy CSV datasets, then download the tidied file.

Stat Calculator

Run t-tests, ANOVA, correlation, and non-parametric tests with effect sizes, CIs, and assumption checks.

Error Bar Gen

Compute mean, SD, SEM, median, IQR, and confidence intervals per group, then plot and export error bars.

Outlier Detector

Flag anomalies in your data using Z-score and interquartile-range (IQR) methods.

Curve Fitter

Fit linear, polynomial, exponential, power, or log models and read off coefficients, R², and RMSE.

Plot Builder

Overlay multiple datasets into one figure, style it fully, and export PNG/SVG or matplotlib code.

XVG Visualizer

Plot GROMACS .xvg and CSV logs interactively; select columns, smooth, and export the figure or Python code.

Computational Chemistry

3D Inspector

View molecular structures and trajectories (PDB, GRO, XYZ) in an interactive 3D WebGL viewer.

Coordinate Manipulator

Translate, center, and measure bounding boxes for PDB and GRO coordinate files.

Scientific Converter

Convert energy, length, pressure, dipole, polarizability and spectroscopic units (Hartree, eV, kcal/mol, kJ/mol, cm⁻¹) against CODATA values.

HPC Script Gen

Generate ready-to-run SLURM job scripts and GROMACS command templates for HPC clusters.

Writing & Citations

Equation Formatter

Build LaTeX equations and matrices visually with a live KaTeX preview, then copy the code.

Visual LaTeX Tables

Paste a table from Excel, edit and merge cells visually, and copy clean LaTeX (booktabs) output.

DOI to BibTeX

Paste a DOI and get a ready-to-use BibTeX citation resolved from Crossref.

BibTeX Deduplicator

Scan a .bib library and merge duplicate entries by DOI and title.

BibTeX Sanitizer

Fix messy BibTeX exports: standardize capitalization, repair braces, and clean fields.

Journal Abbrev

Convert full journal names to their ISO 4 / CASSI standard abbreviations.

Focus & Flow

Ambient Pomodoro

A focus timer with adjustable ambient sounds like rain and cafe noise for deep work.

Decision Matrix

Weigh options against criteria in a scored matrix to rank your best choice.

Kinetic Sandbox

An interactive fluid and particle physics playground, a calm visual break.

Private by design

Every tool runs entirely in your browser. Your data is never uploaded to a server.

Instant & offline

No loading queues or round-trips. Tools work even with your network disconnected.

Free, no sign-up

All 21 tools are free to use with no account, no ads, and no paywalls.

Built for research

Rigorous methods, cited constants, and publication-ready, reproducible output.

Loved by researchers and students

From late-night thesis crunches to publication figures, STEMKit fits into real scientific workflows.

“The Plot Digitizer saved me hours pulling numbers out of an old paper's figures. I had a clean CSV in about ten minutes.”
PhD
Materials-science PhD student
Digitizing literature data
“I use the stats calculator to sanity-check results before writing them up, Welch's t-test, effect sizes and assumption checks in one place is exactly right.”
PD
Postdoctoral researcher
Biosciences
“Being able to build a figure and copy the matplotlib code means my plots are reproducible. Everything staying in the browser is a big plus for sensitive data.”
CB
Computational biologist
Figures & reproducibility
“The XVG visualizer is the fastest way I've found to eyeball a GROMACS run. I drop in an RMSD file and immediately see if the simulation converged.”
MD
Molecular-dynamics researcher
Simulation analysis
“DOI to BibTeX plus the sanitizer cleaned up a reference list that had been a mess for months. My bibliography finally builds without errors.”
GR
Graduate researcher
Thesis writing
“I teach an undergrad lab and point students straight to the error-bar and curve-fitting tools. No installs, works on Chromebooks, and the methods are sound.”
LI
Lab instructor
Undergraduate teaching
“The unit converter with real CODATA constants is a small thing that saves me constantly, Hartree to kcal/mol without second-guessing the factor.”
QC
Quantum-chemistry PhD
Energy calculations
“LaTeX tables used to eat an hour of my day. Paste from a spreadsheet, tidy it up, copy the booktabs code, done. It's become part of my paper workflow.”
AP
Applied-physics postdoc
Manuscript preparation