Concentrations vs Mole OTG
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
Mole OTG
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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
Verdict
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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Concentrations ships an update every 3 months, Mole OTG daily. The most recent releases landed on October 17, 2026 and October 20, 2026 respectively.
| Parameter | Concentrations | Mole OTG |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 months | Daily — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Devices | iPhone | iPhone, iPad, iPod — better |
| Requires iOS | 18.5 | 12.0 — better |
| Further details — not scored | ||
| Size | 7 MB | 31 MB |
| Age rating | 4+ | 4+ |
| Developer | Marcal Casas Cartagena | Japality Limited |
In-app purchases
Concentrations
No in-app purchases
Mole OTG
No in-app purchases
Questions
Is Concentrations free?
Is Mole OTG free?
Do Concentrations or Mole OTG have ads?
Which is updated more often, Concentrations or Mole OTG?
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