Dev tools · alternatives · 2026
24 alternatives to Diffmate
Compare million-row CSV & Excel files in your browser — free
Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes.
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A fast diff tool for comparing csv files. Contribute to aswinkarthik/csvdiff development by creating an account on GitHub.
2019 · github.com · its alternatives →
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Diffchecker 2.0▲153Check the differences between two text files, images or PDFs
2020 · diffchecker.com · its alternatives →
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Gleb, Alex, Erez and Simon here – we are building an open-source tool for comparing data within and across databases at any scale. The repo is at https://github.com/datafold/data-diff, and our home page is https://datafold.com/. As a company, Datafold builds tools for data engineers to automate the most tedious and error-prone tasks falling through the cracks of the modern data stack, such as data testing and lineage. We launched two years ago with a tool for regression-testing changes to ETL code…
2022 · its alternatives →
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Compare CSV files with 10s of millions of rows in seconds.
Jan 2026 · lake3tools.com · its alternatives →
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Compare, merge and split messy files in seconds.
Jun 2026 · messymatch.com · its alternatives →
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100% Free Private Excel tools | Zero data leaves your device
Feb 2026 · sheetrows.com · its alternatives →
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Search, Aggregate, & Plot CSVs with millions of rows
2017 · csvexplorer.com · its alternatives →
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I 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…
2025 · apps.microsoft.com · its alternatives →
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This brand new secure diffchecker. It's supports text/code diff upto 25k lines with character level diff all in browser. Supports one of the best inhouse diff merge feature. https://diffchecker.dev/ Now, add list diff - to compare two lists and show unique, common and diff between two lists. https://diffchecker.dev/list/ Add json diff, supports semantic json difference. https://diffchecker.dev/json/ With consistent, clean, minimal UI elements. Would you switch from other websites. Please checkout and provide feedback.
Nov 2025 · diffchecker.dev · its alternatives →
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VeriDiff▲13Document comparison in your browser - Excel, Word, PDF, CSV
2025 · veridiff.com · its alternatives →
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Simple command-line utility to convert CSV, TSV and Excel files into a single self-contained HTML page with search, filters, and sorting - vividvilla/csvtotable
2017 · github.com · its alternatives →
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Deterministic CSV/Excel reconciliation. No AI, no uploads.
Apr 2026 · sheetpair.com · its alternatives →
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Effortless Excel & CSV merging for clean, consistent outputs
Dec 2025 · filemerger.online · its alternatives →
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My partner reviews a lot of P&IDs (piping and instrumentation diagrams) and the adjacent files involved (excel, docx, pdfs, acd/l5x, etc). In his company, these are usually done in Bluebeam. It's really hard to see the diff + keep track of all the revisions resulted by these iterations. They end up storing files like "rev3_final_redlined.pdf". We've been looking for something close to Github to do these reviews, but haven't found one easy enough for folks with no CLI experience to understand and use (happy to check out more tools if you know any). So I built withkord.com to help with…
Aug 2026 · withkord.com · its alternatives →
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Excel comparison | makspilot | CSV comparator
2025 · makspilot.com · its alternatives →
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Compare files by meaning—not just lines
Aug 2026 · martingruner.com · its alternatives →
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Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →