Lumen - Periodic Table
Chemistry trends you can see
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
Lumen is a periodic table app for people who want to understand chemistry, not just memorise it. The home screen is the table — but every interaction is built to surface the patterns underneath. Tap “Atomic radius” and the cells re-color into a violet gradient with arrows showing how the trend grows down columns and shrinks across rows. The same goes for electronegativity, ionization energy, and metallic character. Once you’ve watched it animate twice, you read the periodic table differently.
Twenty short lessons teach the families and the trends. Reading the table starts with rows, columns, and the four blocks. Then alkali metals, halogens, and the noble gases — what they share, why they react the way they do. Then four trend tracks (radius, electronegativity, ionization energy, metallic character) that each unpack the pattern, the why, and how to predict it. Each lesson is four to five minutes. Wrong answers feed a small spaced-repetition queue you clear on a coffee break the next morning.
Seven tools beyond the table. An equation balancer that takes any reaction you can type and returns the smallest whole-number coefficients — then works the stoichiometry from a mass you supply. A molar mass calculator with a custom chemistry keyboard (no more hunting through the system keyboard for capital letters). A gas law solver that rearranges for whichever variable you leave blank. Compare mode — pick two to four elements and see them on a radar chart with an auto-generated caption. A 3D orbital viewer you can spin with your finger. A build-a-compound sandbox that tells you what you’ve made. An isotope explorer with humanised half-lives (“4.5 billion years” beats “1.4×10¹⁷ seconds”).
Built honestly. Lumen is offline-first — every element, lesson, and isotope ships in the app. No accounts, no subscriptions, no tracking. Your chemistry stays on your device: searches, favorites, lesson progress, and typed formulas are never transmitted. Analytics is anonymous and off unless you turn it on. The full periodic table, every element’s detail page, the trend goggles, search, favorites, today-in-chemistry, the daily review queue and the first five lessons are free and always open. Everything else — the other fifteen lessons, five of the tools, PDF export, unlimited equation balancing — opens for the rest of the day when you choose to watch one short video. Ads pay for all of it: a small banner at the bottom of the screen, and a full-screen ad between activities — after you finish a lesson or a review, never during one. Every ad is non-personalised.
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Minor update!
The developer, Haileslassie Lilay Desalegn, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Identifiers
- Usage Data
- Diagnostics
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Identifiers
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Haileslassie Lilay Desalegn
- Size
- 73.2 MB
- Category
- Reference
- Compatibility
Requires iOS 16.4 or later.
- iPhone
Requires iOS 16.4 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Contains
Advertising
- Copyright
- © GeezApps