CSVFiddle – Query CSV files with DuckDB in the browser

In plain words

CSVFiddle is a browser-based tool that lets users query CSV files using DuckDB, a SQL query engine. It runs entirely in the browser without requiring installation or server setup. The tool is designed for anyone who needs to analyze or manipulate CSV data quickly, from data analysts to casual users exploring datasets. It combines the simplicity of CSV files with the power of SQL queries, making data exploration and analysis accessible through a familiar web interface.

written from the facts on this page · September 2026

• DU
  Duck-UI – Browser-Based SQL IDE for DuckDB2025 · demo.duckui.com · ▲213

  I built Duck-UI, a web-based SQL editor that runs DuckDB entirely in your browser via WebAssembly. No backend required. The Problem: Every time I needed to query csv, parquet, or even to play with SQL, I had to either: (a) spin up a Jupyter notebook (b) use the CLI (c) upload to a hosted service. Friction at every step (TOO MUCH to load a csv or even to test some sql (study)... The Solution: DuckDB's WASM runtime lets us run SQL analysis client-side. Load CSV/JSON/Parquet files from disk or URL, write SQL, get results instantly. Data stays on your machine. What It Does: SQL editor…

• 
  WhatTheDuck – open-source, in-browser SQL on CSV files2024 · github.com · ▲119

  WhatTheDuck is an in-browser sql tool to analyze csv files that uses duckdb-wasm under the hood. Please provide feedback/issues/pull requests.

• 
  cq – Query CSVs using SQL2019 · github.com · ▲80

  Query CSVs using SQL. Contribute to jolmg/cq development by creating an account on GitHub.

• 
  SQL workbench in the browser2024 · sql-workbench.com · ▲117

  Free browser-based SQL editor powered by DuckDB. Query and visualize CSV, JSON, Parquet and Arrow files locally or from remote URLs. No installation required.

• 
  Csvbox.io – CSV import button for a web app, SaaS or API2021 · csvbox.io · ▲155

  Drop a production-ready CSV, Excel, and PDF importer into your SaaS in minutes. Handle up to 2 million rows per import, with column mapping, validation, webhooks, and clean data delivered to your API.

• 
  Open-source, browser-local data exploration using DuckDB-WASM and PRQL2024 · github.com · ▲227

  Hey 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…

• 
  /dev/null▲486

  a social network for devs

  Dev tools · 3d ago · dev-null.sh

• 
  Whiteboard (YC W26) – an open-source IDE for thoughtful software design▲423

  open-source IDE for thoughtful software design. Contribute to devdotfast/whiteboard development by creating an account on GitHub.

  Dev tools · 28d ago · github.com

• 
  Reladraw – A diagram language where you decide where to place things▲411

  Contribute to reladraw/reladraw development by creating an account on GitHub.

  Dev tools · 26d ago · github.com

• 
  OpenBot▲362

  Grok Bot alternative: free, local, open-source, multiplayer

  Dev tools · 23d ago · openbot.run

• 
  Talanoa▲346

  Hi HN, I’m a fullstack developer, and honestly, I’ve lost count of how many side projects I’ve worked on over the years. But one idea kept coming back to me: a different kind of email client. It first came to me in 2014: “What if we could handle emails more like conversations?” Every year, I’d revisit this concept in my “Build Notes.” Ten years later, no one had built exactly what I had in mind — so I finally decided to do it myself. That’s how Talanoa was born. I wanted something focused on people, not timelines. I was tired of marking messages as unread just to remember to reply later, or…

  Dev tools · 21d ago · talanoa.email

• 
  CoreSpeed▲332

  One MCP for everything your agents need: apps, memory, tools

  Dev tools · 28d ago · corespeed.io

• 
  Locofy.ai▲720

  Hey there, I am Honey - Co-founder at Locofy. We, along with other makers, have been building Locofy.ai to help massively accelerate the builders - the designers, developers, product managers & founders, and we're excited to share it today with the HN Community. Locofy.ai simply converts designs into production-ready frontend code for web and mobile apps. It adapts to your preferred design tools, tech stack, and workflows with ease and lets you launch upto 4x faster, while letting designers design the way they want and giving high-quality responsive code that developers love. With this…

  Dev tools · 2022 · locofy.ai

• PO
  Porting OpenBSD Pledge() to Linux▲571

  Life & fun · 2022 · justine.lol

• 
  PocketBase – Open Source realtime backend in one file▲563

  Open Source realtime backend in 1 file. Contribute to pocketbase/pocketbase development by creating an account on GitHub.

  Dev tools · 2022 · github.com

• 
  ruttl▲552

  Visual & Design Feedback Tool that helps you review design, content and report bugs on websites, applications, PDFs and images.

  Dev tools · 2022 · ruttl.com

• 
  Pipes puzzle (a.k.a. Net) on a hexagonal grid▲537

  Hello, HN - I wanted to share this puzzle game I made during my vacation. I'm rather fond of the pipes puzzle where your goal is to restore a scrambled network of connections by rotating tiles. It's usually played on a grid of squares and this all started when I decided to make a programmatic solver for that kind of puzzle. Then I realized that with some minor changes the solver could generate new puzzle instances. I thought about what kind of puzzle to make and someone suggested a hexagonal grid. Adapting the generator wasn't too hard but then I had to create a way to play this variant. So…

  Life & fun · 2022 · hexapipes.vercel.app

• 
  Parsnip – Duolingo for Cooking▲536

  We're building Parsnip to create a "tech tree" of cooking skills that allows anyone to level up on the building blocks of cooking knowledge while tracking their progress over time. It took us a few iterations to figure out the right product; here's the story of our latest pivot: [https://parsnip.substack.com/p/a-new-hope] The goal is to create a personalized way to learn any recipe on the Internet, then use this as a springboard to help home cooks of all levels solve the problem of repeated meal planning in a 10x better way:…

  Work · 2022 · parsnip.ai