Comparison

Stoichiometry vs Model ChemLab for iPad

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

Model ChemLab for iPad

Features
Read full description

Model ChemLab for iPad is an interactive Chemistry Lab Simulation. Model ChemLab is ideal for distance learning, hybrid labs, demonstrations, lab run-throughs, pre-lab work, dangerous and environmentally hazardous, expensive, or lengthy labs. ChemLab comes with a large selection of pre-defined labs simulations including: Acid/base reactions, bond lab, cations reactions, electrochemistry, equilibrium, flame lab, fractional crystallization, fractional distillation, gas laws, gravimetric analysis, kinetics, nuclear chemistry, redox reactions, stoichiometry, thermal chemistry, volumetric analysis, water quality, weak acid titration and many more... ChemLab also allows instructors to develop and distribute their own lab simulations, using our Model ChemLab Professional desktop software for MacOS or Windows. ChemLab includes a large selection of lab equipment, including: beakers, calorimeter, centigram & electronic balances, electrochemical cell, Erlenmeyer flasks, test tubes, gas syringes with pressure gauges, graduated cylinders, burets, pipets, watch glasses, filtering flask with buchner funnel, bunsen burner, hot plate / Magnetic stirrer, stirring rods, distillation equipment setup, calorimeter, conductivity meter, geiger counter, potentiometer, spectrophotometer and more…

Screenshots

Stoichiometry4 screens

Verdict

The call

The clearest difference is price: Stoichiometry at $2.99 against Model ChemLab for iPad's $33.99. Model ChemLab for iPad's advantage is update cadence (weekly vs every 2 months) and iOS requirement (14.0 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 Model ChemLab for iPad $33.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Stoichiometry ships an update every 2 months, Model ChemLab for iPad weekly. The most recent releases landed on September 7, 2026 and September 23, 2026 respectively.

Scorecard3 real differences Β· 5 level
Stoichiometry versus Model ChemLab for iPad: the parameters behind the verdict, then further details
ParameterStoichiometryModel ChemLab for iPad
Price$2.99 β€” better$33.99
Positive reviews50.0% of reviewsβ€”
Update frequencyEvery 2 monthsWeekly β€” better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidβ€”
DevicesiPhone, iPad β€” betteriPad
Requires iOS17.114.0 β€” better
Further details β€” not scored
Size1 MB19 MB
Age rating4+4+
DeveloperRoman VolinskyModel Science Software Inc.

In-app purchases

None

Stoichiometry

No in-app purchases

None

Model ChemLab for iPad

No in-app purchases

Questions

Is Stoichiometry free?
Stoichiometry costs $2.99, with no in-app purchases.
Is Model ChemLab for iPad free?
Model ChemLab for iPad costs $33.99, with no in-app purchases.
Do Stoichiometry or Model ChemLab for iPad have ads?
Neither Stoichiometry nor Model ChemLab for iPad shows ads.
Which is updated more often, Stoichiometry or Model ChemLab for iPad?
Stoichiometry ships an update every 2 months, and Model ChemLab for iPad weekly. Most recently, Stoichiometry was updated on September 7, 2026 and Model ChemLab for iPad on September 23, 2026.

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