Comparison

Concentrations vs Mole OTG

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

Head to head
About

Concentrations

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Concentrations is a powerful chemical calculator designed for laboratory professionals who need fast, accurate concentration calculations in the field. Say goodbye to manual dilution factor calculations, density conversions, and purity adjustments. The Problem We Solve: Ever needed to prepare a 1M sulfuric acid solution, but your stock bottle only shows "98% w/w" with molecular weight and density? Concentrations does the complex math for you instantly—just input your stock solution data and get precise preparation instructions with a single tap. Key Features: Smart Dilution Calculator – Calculate dilution parameters from stock solutions or known molar concentrations with ease Comprehensive Concentration Types – Support for Molar, Normal, Molal, Mole Fraction, Mass Concentration, Volume Fraction, and more Simple Input, Powerful Results – Enter your compound's molecular weight, desired concentration, and volume—Concentrations handles the rest Customizable Precision – Adjust decimal places in results to match your experimental requirements Localized Interface – Automatically adapts decimal indicators to your regional format Who It's For: Perfect for chemists, laboratory technicians, students, and researchers who need reliable concentration calculations without the hassle of manual computation. Stop fumbling with calculators and conversion tables. Get accurate results every time with Concentrations.

About

Mole OTG

Features
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Molar mass & mole ⇄ mass conversions Solution concentration, dilution, % (planned) Stoichiometry helpers Titration support basics Gas law (ideal gas) modules (if included build) pH / buffer (if enabled) Unit conversions (mass, volume, temperature, pressure, energy, etc.)

Screenshots

Concentrations4 screens
Mole OTG3 screens

Verdict

The call

The clearest difference is ads: Concentrations at none against Mole OTG's shown. Mole OTG's advantage is update cadence (daily vs every 3 months) and device support (3 vs 1). On price and in-app purchases 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

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Concentrations ships an update every 3 months, Mole OTG daily. The most recent releases landed on October 17, 2026 and October 20, 2026 respectively.

Scorecard4 real differences · 2 level
Concentrations versus Mole OTG: the parameters behind the verdict, then further details
ParameterConcentrationsMole OTG
PriceFreeFree
Update frequencyEvery 3 monthsDaily — better
AdsNo — betterYes
In-app purchasesNoNo
DevicesiPhoneiPhone, iPad, iPod — better
Requires iOS18.512.0 — better
Further details — not scored
Size7 MB31 MB
Age rating4+4+
DeveloperMarcal Casas CartagenaJapality Limited

In-app purchases

None

Concentrations

No in-app purchases

None

Mole OTG

No in-app purchases

Questions

Is Concentrations free?
Concentrations is free to download, with no in-app purchases.
Is Mole OTG free?
Mole OTG is free to download, with no in-app purchases.
Do Concentrations or Mole OTG have ads?
Mole OTG shows ads; Concentrations does not.
Which is updated more often, Concentrations or Mole OTG?
Concentrations ships an update every 3 months, and Mole OTG daily. Most recently, Concentrations was updated on October 17, 2026 and Mole OTG on October 20, 2026.

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