VisiLens
Open 1M+ rows in <2s. Local-first CSV & Parquet explorer.
VisiLens launched on December 2, 2025 with 6 votes, #1,714 of 11,628 launches that month.
What it does
VisiLens solves the dilemma between slow Excel and complex Pandas code. It is a local-first, zero-config data explorer. What's different: Speed & Scale: Opens 1M+ rows in ~1.7s by streaming data from the VisiData engine. Privacy: Runs 100% locally via FastAPI/React. Your data never leaves your machine. Usability: Provides a modern, mouse-friendly web GUI (sorting, filtering) for quick exploration without needing to memorize CLI shortcuts.
A fast, local-first web GUI for exploring large CSV/Parquet/JSONL files. Powered by VisiData’s engine. Opens millions of rows instantly. Works with local files, SSH servers, and Jupyter. Your new data debugging lens. - PStarH/VisiLens
Does a similar job
all alternatives →- VOVisprex – Open-source, in-browser data visualisation tool for CSV files2024 · docs.visprex.com · ▲194
Hello HN. I've always found writing data visualisation scripts boring and repetitive in data science workflows earlier in my career, so I built this tool to automate it. The available methods are based on my experience in econometrics where histograms and scatterplots were the starting points to check data distributions. The link is to the documentation and the app is freely available at https://visprex.com, and if you're curious about the implementation it's open source at https://github.com/visprex/visprex. I'd appreciate any comments and feedback!
Open-source, browser-local data exploration using DuckDB-WASM and PRQL2024 · github.com · ▲227Hey HN! We’ve built Pretzel, an open-source data exploration and visualization tool that runs fully in the browser and can handle large files (200 MB CSV on my 8gb MacBook air is snappy). It’s also reactive - so if, for example, you change a filter, all the data transform blocks after it re-evaluate automatically. You can try it here: https://pretzelai.github.io/ (static hosted webpage) or see a demo video here: https://www.youtube.com/watch?v=73wNEun_L7w You can play with the demo CSV that’s pre-loaded (GitHub data of text-editor adjacent projects) or upload…
VisiData – vi for data2017 · github.com · ▲221A terminal spreadsheet multitool for discovering and arranging data - saulpw/visidata
CSV GB+ by Data.olllo – Open and Process CSVs Locally2025 · apps.microsoft.com · ▲51I built CSV GB+ by Data.olllo, a local data tool that lets you open, clean, and export gigabyte-sized CSVs (even billions of rows) without writing code. Most spreadsheet apps choke on big files. Coding in pandas or Polars works—but not everyone wants to write scripts just to filter or merge CSVs. CSV GB+ gives you a fast, point-and-click interface built on dual backends (memory-optimized or disk-backed) so you can process huge datasets offline. Key Features: Handles massive CSVs with ease — merge, split, dedup, filter, batch export Smart engine switch: disk-based "V Core" or RAM-based "P…
CSV Explorer (YC F1) - Explore CSVs with Millions of Rows2017 · csvexplorer.com · ▲60Search, Aggregate, & Plot CSVs with millions of rows

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