Comparison

Plutocalc+ Water vs Tail Number offline database

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

Head to head
About

Plutocalc+ Water

This comprehensive engineering calculator suite offers over 100 solvers for water treatment, hydraulics, and environmental chemistry. It provides instant results with self-explanatory diagrams and internal databases, functioning completely offline. Available in multiple languages, it's designed for professionals needing precise calculations on the go.

Highlights
  • 103 solvers for water treatment and hydraulics
  • 2670+ calculations with instant results
  • Self-explanatory diagrams
  • Internal chemical and standards databases
  • 100% offline functionality
  • Multiple language support
  • Advertisement-free experience
Features
Read full description

Plutocalc is the most complete and popular problem solver suite for water treatment, wastewater, hydraulics, environmental chemistry and unit conversions. Plutocalc+ is a premium version of the free Plutocalc packed some extras. For iOS, only the premium version is available. Features: - 103 solvers - 2670+ different calculations - Self explanatory diagrams - Internal databases for chemicals and standards - Results as you type, nothing is faster than that! - Multiple languages: English, Portuguese and Spanish - Available for multiple platforms - 100% offline, no data connection required - Advertisement free NOTE: If after the update the program loads to a blank screen, just reinstall to fix. Solver list: Conversions - Angle - Area - Conductivity and resistivity - Density and concentration - Energy - Flow - mass - Flow - volumetric - Flux and rates - Forces - Hardness in water - Length - Mass - Power - Pressure - Speed - Temperature - Time - Volume Geometry - Buffer tank capacity - Cylinder volume - Cone volume - Cube volume - Circle properties (radius, diameter, perimeter and area) - Horizontal cylindrical tank volume - Triangle properties with sides/angles determination - Municipal plants flow estimation - Nominal pipe sizes and wall thickness - Sieve sizes according - Rainfall volume Energy and power - Head loss in pipes - Open channels or partially filled pipes - Orifice plates with incompressible fluids - Parshall flumes flow measurement - Rectangular flumes flow measurement - Flow adjustment for dosing/metering pumps - Pump power and energy consumption - Blowers and compressors power and energy consumption - Mixing velocity gradient - Reynolds number and speed Contaminants - Boiler water quality and blowdown - Periodic table of elements with oxidation states - Ionic Balance and Conductivity - CO2 conductivity in pure water - TOC, COD and KMnO4 relations - Langlier Saturation Index - LSI - Ryznar Stability Index - RSI - Silt Density Index - SDI - Modified Fouling Index - MFI - Sludge Volume Index - SVI Solutions - Chemical dosing flow, mass and concentrations - Dry chemical dosing flow - Chemical solutions density database - Water properties (viscosity, density) - Gases properties (density and molecular weight) - Oxygen solubility in water - Multiple streams blending - Specific gravity, Baumé, Brix and API relations Adsorption and Ion Exchange - Sorption/Exchange capacity - Empty Bed Contact Time and BV/h - Ion Exchange regeneration - Ion Exchange softener design Filters and membranes (Reverse Osmosis, Ultrafiltration and Nanofiltration) - Cylindrical filter rate and speed - Microfiltration / Ultrafiltration comparison and normalization - Reverse Osmosis membranes and datasheets comparison - Reverse Osmosis plant normalization and performance comparison - Reverse Osmosis / NF skid design - Recovery - Recovery for membranes in series - Normalized permeability - Granular media head loss (sand, resins, anthracite, carbon and custom) - Granular media backwash expansion rate Reactions - pH equilibrium for: Ammonia, Sulfates, Boric Acid, Sulfides, Silicic Acid, Phosphates and Nitrous Acid - Equilibrium for Carbonates with temperature dependence - Disinfection with Chlorine, Chlorine Dioxide, Chloramines and Ozone - Disinfection with Chlorine for Giardia Cysts - Disinfection with UV - Iron oxidation and precipitation - Manganese oxidation and precipitation - Sludge from chemicals - Food-to-microorganisms ratio - F/M - Ultimate BOD Clarifiers - Surface loading rate - circular - Surface loading rate - rectangular - Hydraulic retention time - HRT - Solids retention time - SRT - Solids loading rate - Volumetric solids loading rate - Return activated sludge recycle - RAS - Discrete sedimentation - Sludge concentration and mass - Sludge age Finance - Ordinary annuity - Annuity due - Compound annual growth rate - CAGR - Interest rate conversions - Simple interest

About

Tail Number offline database

Access a comprehensive database of aircraft registration information without needing an internet connection. Track the planes you observe in the sky with this offline utility.

Highlights
  • Offline aircraft database
  • FAA registration lookup
  • Transport Canada registration lookup
  • Track seen aircraft
  • No internet required
Features
Read full description

Use Tail Number offline database to look up aircraft even when you don't have cell service! Tail Number offline database has a copy of all aircraft publicly registered with the FAA and Transport Canada, and can be used to keep track of which ones you've seen while airborne.

Screenshots

Plutocalc+ Water4 screens
Tail Number offline database4 screens

Verdict

The call

The clearest difference is price: Tail Number offline database at Free against Plutocalc+ Water's $4.99. Tail Number offline database also leads on rating (5.0 vs 4.0) and update cadence (monthly vs every 3 months). On ratings volume, 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

Tail Number offline database is free to download; Plutocalc+ Water costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Tail Number offline database holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

UpkeepUpdate frequency

Plutocalc+ Water ships an update every 3 months, Tail Number offline database monthly. The most recent releases landed on October 14, 2026 and October 7, 2026 respectively.

Scorecard4 real differences · 5 level
Plutocalc+ Water versus Tail Number offline database: the parameters behind the verdict, then further details
ParameterPlutocalc+ WaterTail Number offline database
Price$4.99Free — better
Rating4.0 (1 ratings)5.0 (1 ratings) — better
Number of ratings11
Update frequencyEvery 3 monthsMonthly — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.013.0
Further details — not scored
Size5 MB78 MB
Age rating4+4+
DeveloperDaniel PeigDan Driscoll

Customer experience

Plutocalc+ Water

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Tail Number offline database

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Plutocalc+ Water

No in-app purchases

None

Tail Number offline database

No in-app purchases

Questions

Is Plutocalc+ Water free?
Plutocalc+ Water costs $4.99, with no in-app purchases.
Is Tail Number offline database free?
Tail Number offline database is free to download, with no in-app purchases.
Which has better reviews, Plutocalc+ Water or Tail Number offline database?
Tail Number offline database is rated higher. Plutocalc+ Water averages 4.0 out of 5 from 1 ratings, while Tail Number offline database averages 5.0 from 1 ratings.
Do Plutocalc+ Water or Tail Number offline database have ads?
Neither Plutocalc+ Water nor Tail Number offline database shows ads.
Which is updated more often, Plutocalc+ Water or Tail Number offline database?
Plutocalc+ Water ships an update every 3 months, and Tail Number offline database monthly. Most recently, Plutocalc+ Water was updated on October 14, 2026 and Tail Number offline database on October 7, 2026.

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