Periora

Periora is the periodic table you'll actually enjoy opening.

Every one of the 118 elements, with data compiled from IUPAC and NIST — atomic weights, electron configurations, physical properties — bundled offline, so it works in class, in the lab, or on a plane. No account. No ads. Ever.

BUILT FOR STUDY • Quiz mode: Symbol → Name and Name → Symbol with instant feedback • Search that understands Arabic and English — حديد, Iron, Fe, or 26 all find the same element • Category filters: pick out the halogens or lanthanides at a glance

BEAUTIFUL AND ALIVE • Animated electron shells for every element • The whole table at a glance on a full-screen iPad • Full dark mode and a design that respects your language — complete right-to-left Arabic

ACCURATE BY DESIGN • Values from IUPAC (2021 standard atomic weights) and NIST • Bundled reference data with a source summary in Settings

PERIORA PRO (optional one-time purchase) • Three free quiz sessions per local day; Pro unlocks unlimited sessions • Table, search and element details remain free • Purchases and restoration use Apple services and require a connection • No subscription, ever

Made for students, teachers, and the chemistry-curious.