Load huge CSVs/XLSX files without crashing your computer

Name: Load huge CSVs/XLSX files without crashing your computer
Availability: InStock
Author: birdchirp

by birdchirp·Apr 8, 2026·3 points·0 comments

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AI Analysis

●●SolidSlickSolve My Problem

WASM engine handles millions of rows when Excel chokes on large files.

Strengths

•WebAssembly formula engine achieves sub-100ms calculation on massive datasets.
•369 Excel-compatible formulas including VLOOKUP, SUMIFS, and pivot tables.
•Cross-platform desktop apps plus browser version with no install required.

Weaknesses

•Free tier limited to 1000 rows, full functionality requires Pro subscription.
•Row Zero and SheetDB already serve the large-spreadsheet-in-browser market.

Post Description

Viztab supports multi-million-row files in the browser and also has Mac/Windows/Linux desktop apps, with 369 built-in spreadsheet formulas including broad Excel-compatible coverage, plus charts, filtering, and export. Free imports the full file and lets you interact with the first 1,000 rows; Pro unlocks full-file interaction.

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