Free tools for data & QA engineers
Small, focused, browser-based tools I built to speed up my own work. Everything runs on your device — no accounts, no uploads, files never leave your browser.
100% client-side · nothing is uploadedParquet File Viewer
Open .parquet files in your browser — inspect schema, metadata, and rows without Spark or Python.
CSV Data Profiler
Drop a CSV and get a full data-quality report: types, nulls, distinct counts, and a 0–100 quality score.
Open tool →JSON → PySpark Schema
Paste JSON and get a PySpark StructType, Spark SQL DDL, and CREATE TABLE — nested types handled.
Pairwise Test Generator
Turn parameters and values into a minimal all-pairs test set. Cover every pair with a fraction of the tests.
Open tool →Fabric Capacity (CU) Estimator
Estimate Microsoft Fabric cost, headroom, and the right F-SKU for your workload with a few sliders.
Open tool →Found a bug or want a tool added? Reach out via the links below — I read every message. These are independent community tools; they're not affiliated with or endorsed by Microsoft, Apache, or any other vendor.