Comparison

Concentrations vs Element OTG

Price, ratings, monetisation and update history for both apps, side by side β€” 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 instantlyβ€”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 volumeβ€”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

Element OTG

Features
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β€’ Complete Periodic Table - All 118 elements with detailed information β€’ Interactive Learning Center - Chemistry quizzes and symbol practice β€’ Smart Search & Filter - Find elements by name, symbol, or properties β€’ Dark Mode Support - Choose light, dark, or follow system theme β€’ Responsive Design - Perfect for phones, tablets, and desktops

Screenshots

Concentrations4 screens
Element OTG4 screens

Verdict

The call

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

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, Element OTG monthly. The most recent releases landed on October 1, 2026 and October 3, 2026 respectively.

Scorecard4 real differences Β· 2 level
Concentrations versus Element OTG: the parameters behind the verdict, then further details
ParameterConcentrationsElement OTG
PriceFreeFree
Update frequencyEvery 3 monthsMonthly β€” better
AdsNo β€” betterYes
In-app purchasesNoNo
DevicesiPhoneiPhone, iPad, iPod β€” better
Requires iOS18.513.0 β€” better
Further details β€” not scored
Size7 MB25 MB
Age rating4+4+
DeveloperMarcal Casas CartagenaJapality Limited

In-app purchases

None

Concentrations

No in-app purchases

None

Element OTG

No in-app purchases

Questions

Is Concentrations free?
Concentrations is free to download, with no in-app purchases.
Is Element OTG free?
Element OTG is free to download, with no in-app purchases.
Do Concentrations or Element OTG have ads?
Element OTG shows ads; Concentrations does not.
Which is updated more often, Concentrations or Element OTG?
Concentrations ships an update every 3 months, and Element OTG monthly. Most recently, Concentrations was updated on October 1, 2026 and Element OTG on October 3, 2026.

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