The offline field guide
Everything on this site plus the calculators, the identifier and the board teardowns, running entirely in your browser with no network. Built for a garage with no signal.
Two ways to keep it
Open the app Download the file
What it does that this site doesn't
- Works with no connection. All 128 components, 140 scale drawings and 25 hazard pages are in the file itself — there is nothing left to fetch.
- Spot prices you control. Edit gold, silver, palladium, platinum and copper by hand, or tap Fetch live prices when you have signal. Every figure in the app recalculates instantly.
- Lot calculators. Estimate contained value by weight, and work out whether a lot actually clears its own refining fees and freight before you ship it.
- An identifier. Narrow an unknown part down by shape, size, colour, how it connects and where it sat on the board.
- Board teardowns with a running order. Tap a region of the board diagram, then work down the strip list.
- Your own photos. Add photos of parts as you meet them, then export a copy of the file with them permanently baked in. That copy is yours — it never expires and never phones home.
How the offline part actually works
There is no trick to it. The app is a single HTML file with every stylesheet, script, data table and drawing inlined into it. Once your device has that one file there is nothing else to load — no images, no fonts, no API, no CDN.
Installing it from the app page registers a small service worker that keeps a copy on the device, so it opens instantly and works in a basement or a scrapyard with no bars. When you do have signal it fetches a fresh copy in the background, so prices stay current without you doing anything.
Downloading the file skips all of that and just gives you the file. Slightly less convenient to open, completely immune to anything going wrong on our end.
Nothing is uploaded anywhere. The photo handling happens entirely inside your browser, and the only network request the app ever makes is the optional live price fetch.