LazySheet

Fast. Simple. Spreadsheet Viewer.

7 followers

Fast. Simple. Spreadsheet Viewer.

7 followers

LazySheet is a fast, free desktop viewer for Excel, CSV and TSV files. Open huge sheets instantly with zero latency on macOS, Windows and Linux.

Free

Launch tags:Productivity•User Experience

Launch Team

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Promoted

Hunter

📌

Hey Product Hunt! 👋 My actual workflow: I get a lot of CSV/Excel files (many from college), and I want to analyze them with ChatGPT/Claude. Two things always annoyed me: 1. I want to control exactly which rows/columns I hand to the AI — not upload the whole file blindly. 2. I just want a quick sum of some numbers without writing =SUM() first. So I made LazySheet, a fast, local-first desktop viewer for spreadsheets. Local-first means your files never leave your machine — no upload, no cloud, no account, no telemetry. It even works fully offline. The only thing that ever leaves your computer is the exact range you choose to copy into the AI. That's the whole point: you decide what the model sees. The features I actually use: - Copy as Markdown — select a range, copy, paste into the AI. Clean table, model reads it perfectly. - Instant aggregates — select cells, the sum shows up. No formula needed. - Opens big files fast — only renders visible rows, so 100MB CSVs don't lag. - Column filters, group-by summaries, find-in-sheet. Reads .xlsx / .xlsm / .xls / .csv / .tsv. Free, runs on macOS / Windows / Linux. 🔗 https://lazysheet.brata.cloud Early release — happy to take feature requests or feedback. What would make this part of your workflow?

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5mo ago

Hunter

LazySheet v0.6.0 is out — and it's the biggest speed + size jump yet. A ~71k-cell .xlsx that used to take ~3 seconds now opens in well under a second (only the visible sheet is parsed up front), and the installed app shrank from ~25 MB to ~10 MB.

What's new in v0.6.0:

⚡ Much faster open — lazy sheet parsing; switching sheets no longer re-parses the whole workbook

📦 Half the size — ~25 MB to ~10 MB installed

🎨 Theme customization — built-in Material Theme palettes, picker moved into Settings

🛠️ Redesigned Settings — wider modal, Zed-style rows, toggle switches, inline language & theme pickers

🗂️ Workspace side panel — with an ask-before-close prompt so you don't lose unsaved work

✨ Window polish — scrolling long filenames, persistent resizable footer, centered titlebar, macOS resize-gap fix

Still the same focused viewer underneath: opens .xlsx, .xlsm, .xls, .csv, .tsv, preserves formatting (merged cells, frozen panes, hyperlinks), pivot-style group-by summaries, range stats, formula support, export to SQL, grid zoom. Built with Tauri (Rust + web). Free, open source, cross-platform.

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5mo ago

Hunter

🚀 LazySheet v0.5.0 is out!

Thanks everyone for the support 🙏 Just shipped a big update:

🔍 Grid zoom 50–200% — ⌘ + scroll, keyboard, or the status bar

🧮 Cell formulas — now supported, and you can copy formulas between cells

🗄️ Export to SQL — turn any sheet into INSERT / UPDATE / UPSERT statements

♻️ Auto-updates (OTA) — install once, it keeps itself current

⚡ ⌘O to open files, ⌘W to close a sheet

Plus fixes: OS "Open with" now works on every platform, Fedora EGL crash gone, and group-by totals handle numeric text correctly.

Still free, open source, no account, no telemetry.

⬇️ Grab it: https://lazysheet.brata.cloud

Would love to hear what you'd want next 👇

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5mo ago

Reviews

What's new in v0.6.0:

⚡ Much faster open — lazy sheet parsing; switching sheets no longer re-parses the whole workbook

📦 Half the size — ~25 MB to ~10 MB installed

🎨 Theme customization — built-in Material Theme palettes, picker moved into Settings

🛠️ Redesigned Settings — wider modal, Zed-style rows, toggle switches, inline language & theme pickers

🗂️ Workspace side panel — with an ask-before-close prompt so you don't lose unsaved work

✨ Window polish — scrolling long filenames, persistent resizable footer, centered titlebar, macOS resize-gap fix