Comparison

Stoichiometry vs Periodic

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

Periodic

Features
Read full description

The PeriodicTableElements is an elegant app that is interactive and fun. Easy to use, easy to understand, simple and effective. It shows the periodic table of elements in variety of ways 1) Classic grid with name that is color coded. You can configure it to look however you like. 2) Visually appealing electron distribution. 3) Visually appealing Lewis dot structure. 4) List that can be sorted based on different element properties like group, period, category etc. These awesome periodic tables can be shared by simple double click anywhere on the table. It is possible to copy the periodic table diagrams as high quality SVG xml. Drag your finger on the periodic table canvas to update elements automatically or tap on an element to see more details. Tap on an element and all the rest of the related elements are highlighted. Details of a selected element is shown in a beautifully drawn animated element. Tap on the animated element and you will see more details that can also be shared. Tapping on the list element will navigate you to a page that shows details of the element. It automatically saves your hard work locally on your device so you can come back and pick up from where you left off as your great effort will not be lost. This is a perfect app if you are a student learning chemistry. This is an app for all student groups. From high school to college to university students. Be creative. Enjoy the app!

Screenshots

Stoichiometry4 screens
Periodic4 screens

Verdict

The call

The clearest difference is price: Periodic at $1.99 against Stoichiometry's $2.99. Periodic also leads on iOS requirement (15.1 vs 17.1). On update cadence, 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 Periodic $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, Periodic every 5 weeks. The most recent releases landed on October 29, 2026 and October 30, 2026 respectively.

Scorecard2 real differences Β· 6 level
Stoichiometry versus Periodic: the parameters behind the verdict, then further details
ParameterStoichiometryPeriodic
Price$2.99$1.99 β€” better
Positive reviews50.0% of reviewsβ€”
Update frequencyEvery 2 monthsEvery 5 weeks β€” better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidβ€”
DevicesiPhone, iPadiPhone, iPad, iPod β€” better
Requires iOS17.115.1 β€” better
Further details β€” not scored
Size1 MB31 MB
Age rating4+4+
DeveloperRoman VolinskyOm Prakash Chapagain

In-app purchases

None

Stoichiometry

No in-app purchases

None

Periodic

No in-app purchases

Questions

Is Stoichiometry free?
Stoichiometry costs $2.99, with no in-app purchases.
Is Periodic free?
Periodic costs $1.99, with no in-app purchases.
Do Stoichiometry or Periodic have ads?
Neither Stoichiometry nor Periodic shows ads.
Which is updated more often, Stoichiometry or Periodic?
Stoichiometry ships an update every 2 months, and Periodic every 5 weeks. Most recently, Stoichiometry was updated on October 29, 2026 and Periodic on October 30, 2026.

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