Web Workers
How vibe coders and indie builders use Web Workers: 25 projects built with it since May 2026.
Projects built with it
25
Share of stated stacks, 4 wks
0.2%
Last 4 weeks vs 8 before
too few to tell
Add-ons built for it
0
Share of stated stacks, per week
Share rather than counts, so changes in how many posts a subreddit lets through don't show up as trends.
Often used with
What's built with it
Latest projects built with Web Workers
- finotti-pi-optimized — Counts prime numbers up to a given limit using a segmented sieve in JavaScript that runs in the phone browser.“I built a prime counter that calculates pi(10^11) in 2 min on my phone browser”
- GridPDF — Provides 28 PDF tools such as merge, split, compress, and Word to PDF that run entirely in the browser without uploading files.“> I built a free, offline, privacy-first SmallPDF alternative after my sister was charged 9usd to compress her CV - no backend, all client-side”
- file-viewer — Renders office documents, CAD drawings, 3D models, archives and other file formats in the browser using client-side decoders.“Built an open-source viewer that parses DOCX, CAD, and 3D models directly in the browser”
- Iditioning — Compares two spreadsheets cell by cell in the browser and highlights differences without uploading files.“Google AdSense rejected our free spreadsheet tool for "Low Value Content" — so we built a live usage counter and pivoted our ads.”
- 2run.tools — Converts, compresses and edits images entirely in the browser without uploading files to a server.“I built 2run.tools: 91 private, in-browser image tools. Zero backend costs, 99 Lighthouse score. What should I improve?”
- PDF NoLimit — Edits PDF text while preserving embedded fonts, runs local OCR on scanned PDFs, and provides a suite of PDF tools that process files entirely in the browser.“6 months ago I shared my tool to edit PDF text without ruining fonts. It's now a full WASM engine: smart local OCR, RAM management for infinite pages without crashing, and a complete suite (100% local, zero paywalls)”
- OmniPic Studio — Scrapes images from web pages, including hidden and lazy-loaded ones, and groups them by visual similarity using on-device image features.“OmniPic Studio: Engineering Whitepaper on In-Browser Visual”
- Vectron — Converts PNG and other raster images into SVG vector files in the browser, with selective area refinement and adjustable filters.“An Image to SVG vectorizer that doesn't suck (as much)”
- PerfectByte — Compresses images and PDFs in the browser to a user-specified exact file size.“I got tired of guessing how much to compress documents for strict job portals, so I built a tool that compresses files to an exact byte size locally.”
- Debug Agency — Teaches JavaScript through detective-style cases where the user fixes broken code, asks for clues, and can reveal the explanation.“I built a noir detective-style JavaScript learning app where every exercise starts with broken code”
- localcsv — Cleans, converts, and analyzes CSV and spreadsheet files entirely in the browser without uploading them to a server.“Got tired of uploading client spreadsheets to random "free CSV tool" sites, so I built one that never leaves the browser”
- Front Office Hoops — Lets users run a basketball franchise's front office with drafts, trades, cap rules, coaching schemes, and fast season simulation in the browser.“I spent the last 8 months building a free basketball GM sim that runs entirely in the browser. It just hit v1.0”
- MotionLab — Extracts measurable motion data from ordinary videos by tracking an object and analyzing its position, velocity, and acceleration in the browser.“I built a local-first motion tracking and physics analysis tool that runs entirely in the browser”
- Sunny Terraces — Shows bars and restaurants on a 3D map that are in direct sunlight at a chosen time, using building shadow calculations.“Find a bar or restaurant in the sun”
- sweatlines — Renders a user's Strava activity tracks as one abstract map and exports it as a high-resolution PNG.“Built a browser-only Strava visualizer with vibe coding”