usci-check
Verify Chinese business-licence codes offline, in-browser
What it does
Every Chinese company's business licence carries an 18-character registration code (USCI). The code has internal structure and a GB 32100-2015 check character, so a code copied from a licence photo can be verified offline - no registry access needed. Free in-browser checker plus an open-source MIT library (zero dependencies), tested against 2,149 real codes from official disclosure files. Honest limit built in: a passing check proves correct transcription, not that the company exists.
Does the same job
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- VDVisaWhen – Data on US visa issuance backlogs2021 · ▲104
Heya! Not the usual sort of thing to be posted here, but I wanted to show off what I made yesterday. Here's a sample page about H1-B visas issued in Bogota: The code is source-available (not open source) at . It's my first time choosing a source-available license over MIT, mainly out of fear of existing immigration startups just gobbling this data and code up; frankly I didn't think the implications through though, I just threw a safe license on there. The way the project works is: - Use requests-html to find publicly available PDFs from government pages - Use camelot to OCR the PDFs and…
- CFCode for your country2015 · govcode.org · ▲5

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Open-source GTM skills for technical founders
Dev tools · 29d ago · gtmcofounder.com


OpenTrailPaper is open-source bike computer firmware for the LilyGO T5S3 4.7" E-Paper PRO. It supports offline maps, GPX routes, FIT recording and Bluetooth sensors.
Dev tools · 1d ago · opentrailpaper.com
Launched alongside, August 2026
the whole month →- TL
Life & fun · 10d ago · louisabraham.github.io


- SA
Hello HN! I found that picking out plausible but diverse skin tones for my digital art and game development projects was kind of difficult, and I got curious about if there was a way to define a color space that made it easy. I've built a color picker and procedural generation algorithm based on the space as well as a bunch of other fun js features and demos throughout the page that use the equations. If you find it interesting, I have lots of explanations of how I built it and what properties the space has. The methodology might be a bit shaky, but hopefully the result is as helpful for…
Life & fun · Aug 2026 · toneyalexander.github.io


I trained a 125M-parameter transformer to autocomplete piano performances in real time (~108 notes/sec on an iPhone 15). The idea is basically GitHub Copilot or Tabnine, except instead of prompting it with code, you prompt it by playing a few notes on a MIDI piano. The model then continues what you played, entirely on-device. The app is free if anyone wants to try it. Happy to answer questions about the model, training, Core ML, or the many things that didn't work.
AI · 16d ago · simedw.com