Comparison

Calc pH vs Air Density Calculator

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

Head to head
About

Calc pH

Features
Read full description

*** pH - Calculator *** "pH - calculator" is used to calculate the pH value of two mixed liquids. Enter the pH and volume for both liquids and then press calculate. The mixed pH-value will then be displayed..

About

Air Density Calculator

Instantly calculate air density and atmospheric properties with this offline engineering tool. Features three modes for density, reverse solving, and altitude estimation, with flexible unit support and calculation breakdown.

Highlights
  • Accurate air density calculation
  • Density, Reverse Solve, and Altitude modes
  • Flexible unit support
  • Show calculation steps
  • Tap to copy results
  • Calculation history
  • Offline functionality
Features
Read full description

Calculate air density and atmospheric properties instantly with this professional engineering calculator. Designed for engineers, pilots, meteorologists, and physics students who need quick, accurate results without an internet connection. Accurate Air Density Calculation Compute air density using the ideal gas law: ρ = (pd / (rd * T)) + (pv / (rv * T)). Enter temperature and pressure in your preferred units and get precise results immediately. Three Powerful Modes • Density Mode - Calculate air density from temperature and pressure inputs • Reverse Solve Mode - Find any unknown variable (pressure, temperature, or density) when the other two are known • Altitude Mode - Estimate temperature, pressure, and air density at any altitude using the International Standard Atmosphere (ISA) model Flexible Unit Support Switch freely between units: • Temperature: Celsius / Kelvin • Pressure: Pa / hPa / atm • Altitude: meters / feet All conversions are handled automatically so you can work in the units you prefer. Show Your Work Tap "Show Steps" to reveal the full calculation breakdown including the formula used, unit conversions, substituted values, and final result. Perfect for learning, teaching, or verifying your work. Tap to Copy Tap any result to copy it to your clipboard instantly. Paste values directly into reports, spreadsheets, or other tools. Calculation History Save your results, review past calculations, or swipe to delete. Built for Professionals • Works completely offline. No internet required. • Clean, distraction-free interface designed for fast input • Built-in reference page with formulas, constants, and unit conversions • Supports Dark Mode • Optimized for iPhone and iPad Who Is This For? • Aerospace and mechanical engineers • Pilots and aviation professionals • HVAC technicians • Meteorologists and atmospheric scientists • Physics and engineering students • Anyone working with gas laws and atmospheric data Download now and get reliable air density calculations in seconds. Thank you for your support. Please visit nitrio.com for more apps for your iOS devices.

Screenshots

Calc pH2 screens
Air Density Calculator4 screens

Verdict

The call

The clearest difference is price: Calc pH at Free against Air Density Calculator's $2.99. Calc pH also leads on iOS requirement (9.0 vs 17.6). Air Density Calculator's advantage is update cadence (every 20 months vs every 59 months). On ads, in-app purchases and device support 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

Calc pH is free to download; Air Density Calculator costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Calc pH ships an update every 59 months, Air Density Calculator every 20 months. The most recent releases landed on November 1, 2026 and November 2, 2026 respectively.

Scorecard3 real differences · 7 level
Calc pH versus Air Density Calculator: the parameters behind the verdict, then further details
ParameterCalc pHAir Density Calculator
PriceFree — better$2.99
Rating—3.8 (4 ratings) — better
Positive reviews—100.0% of reviews
Number of ratings—4 — better
Update frequencyEvery 59 monthsEvery 20 months — better
AdsNoNo
In-app purchasesNoNo
Monetization—Paid
DevicesiPhone, iPodiPhone, iPad
Requires iOS9.0 — better17.6
Further details — not scored
Size0 MB1 MB
Age rating4+4+
DeveloperZOFTERMNitrio

In-app purchases

None

Calc pH

No in-app purchases

None

Air Density Calculator

No in-app purchases

Questions

Is Calc pH free?
Calc pH is free to download, with no in-app purchases.
Is Air Density Calculator free?
Air Density Calculator costs $2.99, with no in-app purchases.
Do Calc pH or Air Density Calculator have ads?
Neither Calc pH nor Air Density Calculator shows ads.
Which is updated more often, Calc pH or Air Density Calculator?
Calc pH ships an update every 59 months, and Air Density Calculator every 20 months. Most recently, Calc pH was updated on November 1, 2026 and Air Density Calculator on November 2, 2026.

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