Comparison

Stoichiometry vs Atom Structure

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

Head to head
About

Stoichiometry

This tool helps balance chemical reactions and calculate molar masses, moles, and actual masses of reactants and products. It supports various formula formats and can identify limiting reagents. Data can be sent to another app for gas phase calculations.

Highlights
  • Balance chemical reactions
  • Calculate molar masses
  • Determine moles and actual masses
  • Identify limiting reagents
  • Supports various formula formats
  • Integrates with Gas Phase Stoichiometry app
Features
Read full description

Stoichiometry is an ultimate tool for balancing chemical reactions, finding molar masses, moles and actual masses of reactants and products based on their chemical formulas, stoichiometric coefficients and any quantitative data provided, that available on Apple Store for iOSΒ and Mac . It is enough to provide initial or final (after reaction accomplishment) mass or moles of one of the reaction component, to calculate all required and obtained masses and moles of all components. If data is available for several components, then limiting reagent will be found based on reaction stoichiometry. Molecular formula format: charge or unpaired electrons (in free radicals), if exist, must be provided as well, separated by coma: Na,+ ; R,: ; SO4,2- . Application supports state indexes: (g), (s), (l), (aq) – all are lowercase only, placed at the end of compound formula. App can send the data toΒ  Gas Phase Stoichiometry app to further calculate pressures and volumes of gaseous compounds. Either moles or masses can be filled in, but if by mistake both are provided and they don’t match, then the moles value will have a preference. Component will be taken into consideration once the stoichiometric coefficient is provided for it. For balancing redox reactions please refer to Electrochemistry application. Further information and examples are provided at http://www.volard.wordpress.com.

About

Atom Structure

Features
Read full description

Explore the fascinating structure of atoms and electron distribution with interactive learning! β€œThe Structure of an Atom (Electron Distribution) by EduTech Era” helps students understand how electrons are arranged around the nucleus and how this arrangement influences chemical behavior. With clear visuals, step-by-step explanations, and interactive examples, this app makes learning atomic structure simple and engaging. Features: - Detailed explanation of atomic structure and electron shells - Interactive visuals to explore electron distribution - Simple, student-friendly language for all learning levels - Real-life examples to connect concepts with chemistry - Zoom, rotate, and explore diagrams for better clarity - Works fully offline - no internet required - Ideal for school students, teachers, and self-learners Whether you're studying chemistry for exams or just curious about atoms, this app provides a complete and engaging way to understand the fundamentals of atomic structure and electron arrangement. Download now and explore the building blocks of matter!

Screenshots

Stoichiometry4 screens
Atom Structure4 screens

Verdict

The call

The clearest difference is update cadence: Stoichiometry at every 2 months against Atom Structure's every 41 months. Atom Structure's advantage is price ($1.99 vs $2.99) and iOS requirement (12.0 vs 17.1). On ads, in-app purchases and device support there is nothing between them.

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

CostPrice Β· In-app purchases Β· Ads Β· Monetization

Stoichiometry costs $2.99 and Atom Structure $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Stoichiometry ships an update every 2 months, Atom Structure every 41 months. The most recent releases landed on September 7, 2026 and September 10, 2026 respectively.

Scorecard3 real differences Β· 5 level
Stoichiometry versus Atom Structure: the parameters behind the verdict, then further details
ParameterStoichiometryAtom Structure
Price$2.99$1.99 β€” better
Positive reviews50.0% of reviewsβ€”
Update frequencyEvery 2 months β€” betterEvery 41 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidβ€”
DevicesiPhone, iPadiPhone, iPad, iPod β€” better
Requires iOS17.112.0 β€” better
Further details β€” not scored
Size1 MB232 MB
Age rating4+4+
DeveloperRoman VolinskyVIRTUAL FILAMENTS PRIVATE LIMITED

In-app purchases

None

Stoichiometry

No in-app purchases

None

Atom Structure

No in-app purchases

Questions

Is Stoichiometry free?
Stoichiometry costs $2.99, with no in-app purchases.
Is Atom Structure free?
Atom Structure costs $1.99, with no in-app purchases.
Do Stoichiometry or Atom Structure have ads?
Neither Stoichiometry nor Atom Structure shows ads.
Which is updated more often, Stoichiometry or Atom Structure?
Stoichiometry ships an update every 2 months, and Atom Structure every 41 months. Most recently, Stoichiometry was updated on September 7, 2026 and Atom Structure on September 10, 2026.

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