Comparison

Concentrations vs Unit Converter....

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

Unit Converter....

Features
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Unit Converter helps you convert measurement units quickly and accurately. Convert length, weight, volume, area, time, speed, energy, pressure, force, power, and angles in one simple tool. The app supports metric, imperial, and US customary measurement systems, making it useful for everyday calculations, study, and professional use. Measurement Conversions • Convert length units such as meters, feet, and miles • Convert weight and mass units including kilograms and pounds • Convert volume units such as liters and gallons • Convert area units for land and surfaces • Convert time units and durations Scientific and Technical Units • Speed and velocity conversions • Energy and power calculations • Pressure and force units • Angle measurements and conversions Instant Calculations • Enter a value once and see results instantly • View conversions across multiple units • Fast and accurate calculations Search and Favorites • Save frequently used conversions • Quickly access favorite unit categories • Navigate conversion tools easily Learning Tools • Educational facts about measurement systems • Quiz mode to test knowledge of units • Structured information about unit systems Designed for Easy Use • Clean and simple interface • Fast navigation between unit categories • Lightweight and efficient design Premium Features Upgrade for additional benefits: • Offline access to conversion tools • Ad-free experience • Improved convenience while converting Privacy Focused • No unnecessary permissions • No personal data collection • Information remains on your device Who This App Is For • Students and teachers • Engineers and technicians • Travelers and everyday users • Anyone needing quick unit conversions Unit Converter helps you convert measurements quickly and accurately across many unit categories. Download Unit Converter and perform conversions anytime. LICENSED APPLICATION END USER LICENSE AGREEMENT: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Concentrations4 screens
Unit Converter....4 screens

Verdict

The call

The clearest difference is in-app purchases: Concentrations at none against Unit Converter....'s 2. Concentrations also leads on ads (none vs shown). Unit Converter....'s advantage is update cadence (every 2 weeks vs every 3 months) and device support (3 vs 1). On price 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. Unit Converter.... sells 2 in-app purchases, starting at $1.99 per month. Concentrations asks for nothing beyond the download.

UpkeepUpdate frequency

Concentrations ships an update every 3 months, Unit Converter.... every 2 weeks. The most recent releases landed on September 13, 2026 and September 17, 2026 respectively.

Scorecard5 real differences · 1 level
Concentrations versus Unit Converter....: the parameters behind the verdict, then further details
ParameterConcentrationsUnit Converter....
PriceFreeFree
Update frequencyEvery 3 monthsEvery 2 weeks — better
AdsNo — betterYes
In-app purchasesNo — betterYes
DevicesiPhoneiPhone, iPad, iPod — better
Requires iOS18.513.0 — better
Further details — not scored
Size7 MB106 MB
Age rating4+4+
DeveloperMarcal Casas CartagenaOlga Ivanova

In-app purchases

None

Concentrations

No in-app purchases

2 purchases

Unit Converter....

Subscriptions1
  • units_by_oliva_subscription$1.991 Month
One-time1
  • units_by_oliva_donation$1.99

Questions

Is Concentrations free?
Concentrations is free to download, with no in-app purchases.
Is Unit Converter.... free?
Unit Converter.... is free to download, with in-app purchases available.
Do Concentrations or Unit Converter.... have ads?
Unit Converter.... shows ads; Concentrations does not.
Which is updated more often, Concentrations or Unit Converter....?
Concentrations ships an update every 3 months, and Unit Converter.... every 2 weeks. Most recently, Concentrations was updated on September 13, 2026 and Unit Converter.... on September 17, 2026.

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