RockSpin
Geology · Thin Section Study
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Free
In-App Purchases
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About
RockSpin brings the polarizing microscope to your fingertips. Designed for geology students, researchers, and educators, this app lets you explore petrographic thin sections with full 360-degree rotation. Compare PPL and XPL views, inspect mineral markers, explore 3D crystal structures, browse a curated rock image catalog, and save favorites across your account.
Every thin section is available at 300px at no charge. Pro ($4.99/month or $49.99/year) unlocks 500px and 700px viewing. Subscriptions auto-renew and can be cancelled in Apple ID settings.
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://rockspin.app/privacy
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What's New in RockSpin
1.2.1
October 2, 2026
Bug fixes and reliability improvements. The Upgrade to Pro button in the AI Assistant now opens the subscription screen, and Pro subscribers no longer see the free-limit message. The assistant button returns after starting the app offline. Sharing from a rock page always uses the rock you are viewing. The offline Crystals list keeps every mineral. Also fixes upscaled thin-section frames, marker editing, the turntable, and subscription status.
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Subscriptions & In-App Purchases
Pro Monthly
Full sample access + 300 AI credits each month.
$9.991 Month
