The periodic table with data you can trust.
All 118 elements and the 18 tables from the back of your chemistry textbook, plus lab calculators and quizzes. Data checked against PubChem, IUPAC, NIST and the IAEA. No ads, no account, and it works offline.
For iPhone, iPad, Mac, Apple Vision Pro and Apple Watch · in 20 languages
Look up, calculate, compare and practice.
Everything you need for chemistry class, in your pocket.
The full table
The copper page
Iron orbitals
Gold versus copper
Solutions calculator
Quizzes by topic
Chemical reactions
Glossary
Instant search
Dark mode
More room on iPad.
The same app in landscape, with the whole table, element pages and tools using every inch of the screen.
Search by symbol
The copper page
Iron orbitals and atomic properties
Gold versus copper
Solutions calculator
Practice by topic
Chemical reactions
Glossary
Home in dark mode
Everything you need for class.
The whole appendix of your chemistry textbook, always two taps away: from electron configuration to Student’s t.
Search the way you think
By name, symbol, atomic number, Latin or English name, CAS number or family.
A page for every element
Over 70 properties, isotopes, emission spectrum and real photos of 97 elements. Touch and hold any value to copy it.
Configuration and orbitals
Orbital diagram with Hund’s rule, unpaired electrons and ground-state term. If the real configuration breaks Madelung’s rule, it tells you.
Compare and spot trends
Two or three elements side by side, 38 sortable lists, a trends chart and a heat map on the table.
Lab calculators
Molar mass with a formula keyboard, equation balancing, solutions and analytical statistics for your measurements, with history.
Quizzes built from the data
Seven topics and three levels. Every answer shows the value behind it, with a link to its element page.
Reactions and glossary
147 reactions with their conditions and oxidation-state changes, ready to open in the balancer, and 173 terms linked to the data.
18 reference tables
Solubility, ionization energies, covalent radii, Van der Waals, Henry’s constants and critical values of t, F, Dixon and Grubbs.
Data you can trust.
Every value is checked against public reference sources, and the sources are listed in the app itself, under More › Data sources. Take the iron page, for example:
| Atomic mass | 55.845 uPubChem · IUPAC |
|---|---|
| Electron configuration | [Ar] 3d⁶ 4s²checked against NIST |
| Electronegativity (Pauling) | 1.83PubChem · IUPAC |
| Stable isotopes | ⁵⁴Fe ⁵⁶Fe ⁵⁷Fe ⁵⁸FeIAEA · NUBASE |
And when a value doesn’t exist, the app doesn’t make one up.
- ---
Anything without a reliable measurement is shown as unknown. An honest gap beats a made-up number.
- 119–124
Hypothetical elements are clearly marked: their data are predictions, not measurements.
- Fe²⁺ Fe³⁺
Oxidation states are split into common, rare and predicted.
Free, with no ads and no data collection.
What you need every day is free. Pro is a one-time purchase that’s yours forever, no subscription; if you prefer, there are also monthly and yearly plans. All three unlock the same thing on every device with your Apple Account.
Free
For studying every day.
- The table, search and element pages with the basic data
- 4 reference tables and 25 lists
- All 147 reactions and the glossary
- Unlimited quiz practice
- Calculators in basic mode
- Apple Watch, widgets and three themes
Pro
One payment, forever. Or monthly or yearly.
- The other 14 tables and 13 lists
- Advanced data: magnetic and electrical properties, the NFPA 704 diamond and every radioactive isotope
- Timed exams, spaced review and stats
- Composition by element, limiting reagent, molality and ppm, confidence intervals and Dixon and Grubbs tests
- All the other themes
Used it back in 2019? It’s back, rebuilt from scratch, and if you bought Premium it’s still yours: it comes back when you open the app or under More › Restore purchases.
What you save stays on your device.
- No accounts or sign-up
- No ads or tracking
- No third-party analytics
- Suitable for students of any age
Made for your Apple devices.
A native app on every screen, using the system features you already know.
- Apple Watch
- All 124 elements on your wrist, independent of your iPhone.
- Widgets
- Element of the day, also on the Lock Screen, plus your favorites.
- Siri, Shortcuts and Spotlight
- “Molar mass in Periodic Table”, or find an element from system search.
- Your units
- Kelvin or Celsius, kJ/mol or eV, and MPa, bar or atm.
- Themes named after scientists
- Lavoisier, Curie and Dalton, designed for color blindness, are free.
- Accessible
- VoiceOver, larger text and dark mode, in 20 languages.
Start studying with data you can trust.
Free on the App Store for iPhone, iPad, Mac, Apple Vision Pro and Apple Watch.