Fold Clock
PaidDuo-native
The time on one half, sleep sounds on the other
Registry/ Apps /FossilVault
On the Duo: Duo-native. Version 2.2.1 brought FossilVault to both iPhone Duo displays, the release notes for 2.2.2 (28 October) say; its maker's site shows the specimen collection as a wide photo gallery on the open Duo. Checked November 5, 2026.
App Store data as of November 5, 2026
Why it's here
Not for
Casual collectors who want a free app outright, since Pro and Max tiers are sold by subscription or a lifetime purchase.
About FossilVault
FossilVault is a catalogue for fossil, mineral, gemstone and rock collections. Each specimen gets structured records for taxonomy or material, geologic age, location, provenance, value and notes, with photos from every angle and a museum-style label that builds as you type. Localities keep your collecting spots and log visits with weather, sunrise, sunset and moon phase, linked to what you found. A wants list, acquisition and trading history, statistics on periods and categories, printable labels, shareable specimen cards, CSV import and export, cloud sync and Home Screen and Lock Screen widgets are all included.
Version 2.2.1 brought the collection to both iPhone Duo displays, with layouts adapted for specimens, localities and stats, the notes for version 2.2.2 (28 October) say. Its maker's site shows the Collection on the open Duo as a gallery four specimens wide, each card with a photo, name, type, locality and tags such as Mineral, Gemstone, Rock or Public.
