Comparison

U.S. Army STARS Elements vs Periodic Table Watch

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

U.S. Army STARS Elements

Explore the world of chemistry with interactive tools to build atoms, learn chemical bonds, and discover elements. Test your knowledge with engaging challenges designed for students, teachers, and enthusiasts.

Highlights
  • Atom Builder
  • SmashBond game
  • Interactive Periodic Table
  • STARS Challenge quiz
  • 3D atom construction
  • Bohr's model visualization
Features
Read full description

U.S. Army STARS Elements is a fun and exciting way to learn chemistry. Build your own atom, play a game to help you learn about chemical bonds, explore the periodic table, and test your chemistry knowledge. Elements is great for students, teachers, and anyone interested in chemistry. U.S. Army STARS Elements includes... Atom Builder - A simple, powerful tool that let’s you construct and discover atoms. Add and subtract protons, neutrons, and electrons and see, in 3D, what you can create. SmashBond - Use the octet rule to bond elements and score points in SmashBond. Swap elements to make 2, 3, or 4 element bonds, and grab bonuses to get a SMASHBOND. It’s a really fun way to help you become familiar with the octet rule and learn common chemical bonds by their type, symbol, name and Lewis dot diagram. Periodic Table - Use the table to view trends and detailed information about each of the 118 elements. See an interactive Bohr’s model and learn interesting facts about the elements. It’s like a regular periodic table, but interactive and fun. STARS Challenge - When you’re ready to test your knowledge, take the STARS Challenge. You’ll be presented with questions in 3 areas (elements, bonding, and atomic configuration). Can you master them all? No matter what your level of experience with chemistry, U.S. Army STARS Elements makes learning fun. Easy to use lesson plans and teacher guides are available at http://usarmystars.com/lessons to help integrate Elements into the classroom.

About

Periodic Table Watch

Features
Read full description

Two different Periodic Table clocks displays:  The simple clock display shows the Atomic Number and either Atomic Weight or Name. Colors indicate Phase: Solid, Liquid, or Gas. Tap to toggle seconds on or off; long-press to switch between Atomic Weight and Element Name. The Complete clock display shows all available information about each element. There's also a scrollable reference view that shows all of the elements, which can be set up as flashcards to test your knowledge.

Screenshots

U.S. Army STARS Elements4 screens

Verdict

The call

The clearest difference is price: U.S. Army STARS Elements at Free against Periodic Table Watch's $0.99. U.S. Army STARS Elements also leads on iOS requirement (11.0 vs 26.0). On update cadence, ads, in-app purchases and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

U.S. Army STARS Elements is free to download; Periodic Table Watch costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

U.S. Army STARS Elements ships an update every 8 months, Periodic Table Watch every 9 months. The most recent releases landed on October 26, 2026 and October 27, 2026 respectively.

Scorecard2 real differences · 8 level
U.S. Army STARS Elements versus Periodic Table Watch: the parameters behind the verdict, then further details
ParameterU.S. Army STARS ElementsPeriodic Table Watch
PriceFree — better$0.99
Rating4.6 (19 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings19 — better—
Update frequencyEvery 8 months — betterEvery 9 months
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPad, iPod — betteriPhone, Apple Watch
Requires iOS11.0 — better26.0
Further details — not scored
Size213 MB6 MB
Age rating9+4+
DeveloperArmy Game StudioJim Haungs

In-app purchases

None

U.S. Army STARS Elements

No in-app purchases

None

Periodic Table Watch

No in-app purchases

Questions

Is U.S. Army STARS Elements free?
U.S. Army STARS Elements is free to download, with no in-app purchases.
Is Periodic Table Watch free?
Periodic Table Watch costs $0.99, with no in-app purchases.
Do U.S. Army STARS Elements or Periodic Table Watch have ads?
Neither U.S. Army STARS Elements nor Periodic Table Watch shows ads.
Which is updated more often, U.S. Army STARS Elements or Periodic Table Watch?
U.S. Army STARS Elements ships an update every 8 months, and Periodic Table Watch every 9 months. Most recently, U.S. Army STARS Elements was updated on October 26, 2026 and Periodic Table Watch on October 27, 2026.

Other comparisons