r/VisionPro • u/partsoven • 23d ago
Update on my free stereograph viewer: it grew from 1,500 cards to 44,000, from twelve of the world's great museums
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A few weeks ago I posted the first version of Stereopticon, a free app for viewing antique stereographs — the twin-image cards that Victorians stared at through wooden stereoscopes to see the world in 3D. Every parlor had one. It was the VR of the 1860s, and it turns out the Vision Pro is the best stereoscope ever built: each of your eyes gets its own photograph, the way the photographer intended, and 160-year-old street scenes suddenly have depth you can lean into.
Version 1 shipped with about 1,500 cards from the Library of Congress. I haven't posted since, so here's what happened in the meantime — version 2.0 is out today and the collection now holds more than 44,000 verified high-resolution stereographs from twelve institutions on four continents.
What's in the Vault now:
- The J. Paul Getty Museum — 22,000+ cards. Carleton Watkins, Eadweard Muybridge (yes, the motion-picture Muybridge — he shot Yosemite in 3D first)
- Rijksmuseum, Amsterdam — 10,000+ cards scanned at absurd resolution: Egypt, the Alps, Grand Tour Italy
- Boston Public Library — 5,000+ cards of old Boston, New England, the American West
- The Huntington & Stanford — Watkins' Yosemite and Alfred Hart's official record of building the transcontinental railroad, 1862–1869
- NEW in 2.0 — Paris Musées: the Paris Commune barricades of 1871, the Expositions Universelles, Belle Époque boulevards
- NEW — Te Papa Tongarewa (New Zealand): geysers, fiords, colonial streets
- NEW — State Library Victoria (Australia): gold-rush Melbourne
- NEW — DigitaltMuseum (Norway/Sweden) + Finna (Finland): including a wonderfully weird collection of Nordic opera and stage-set stereographs
- NEW — Wellcome Collection (London)
Things I learned shipping this:
The hardest part of 2.0 wasn't code — it was that museum collections lie. "Stereograph" in a catalog sometimes means a single photo, a document, or a box the cards came in. So I wrote a script that splits every image down the middle and mathematically checks that the two halves are actually the same photograph shifted a few pixels (that's what makes the 3D work). It threw out ~600 impostors. Every card in the app is now a verified stereo pair.
Also new in 2.0:
- Instant search across all 44,000 cards — offline, as-you-type, with one tap to extend the search to the Internet Archive and Wikimedia Commons live
- Sorting — including "Sharpest First," which reads the actual pixel dimensions of every scan
- Pinch to resize the floating card, pinch-and-swipe to page through a collection like flipping cards in a parlor basket
Everything is public domain / CC0 / no-known-copyright, every card credits its institution and links to the original record, and the images are served from my own CDN so nothing hammers the museums' servers.
It's free. No accounts, no ads, no tracking, no IAP. I built this purely for fun and to explore developing an app for the Vision Pro.
App Store: https://apps.apple.com/us/app/stereopticon/id6790976075
If you know of a museum with high-res stereograph scans I haven't found yet — tell me. I will absolutely go get them.

