Comparison

Plutocalc+ Water vs FLOWatch

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

FLOWatch

This app helps manage operational data for water and wastewater treatment plants. It tracks data, manages assets, and handles work orders and compliance reporting, even in areas with limited connectivity.

Highlights
  • Track water quality data
  • Manage plant assets
  • Work order management
  • Compliance reporting
  • Offline data storage
  • Mobile and web integration
Features
Read full description

FLOWatch Operational Data Management is used to track and fulfill water and wastewater ops data, asset management, work ordering and compliance reporting. Mobile app works in conjunction with the web platform to allow plant operators to store water quality and process data from remote locations where connectivity is limited.

Screenshots

Plutocalc+ Water4 screens
FLOWatch3 screens

Verdict

The call

The clearest difference is price: FLOWatch at Free against Plutocalc+ Water's $4.99. FLOWatch also leads on rating (5.0 vs 4.0). Plutocalc+ Water's advantage is iOS requirement (12.0 vs 15.0). On ratings volume, update cadence, ads 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

CostPrice · In-app purchases · Ads · Monetization

FLOWatch 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

FLOWatch 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

Both ship on a similar rhythm, roughly every 3 months. The most recent releases landed on August 29, 2026 and September 17, 2026 respectively.

Scorecard4 real differences · 5 level
Plutocalc+ Water versus FLOWatch: the parameters behind the verdict, then further details
ParameterPlutocalc+ WaterFLOWatch
Price$4.99Free — better
Rating4.0 (1 ratings)5.0 (1 ratings) — better
Number of ratings11
Update frequencyEvery 3 monthsEvery 3 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.0 — better15.0
Further details — not scored
Size4 MB29 MB
Age rating4+4+
DeveloperDaniel PeigFLOWatch LLC

Customer experience

Plutocalc+ Water

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

FLOWatch

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

In-app purchases

None

Plutocalc+ Water

No in-app purchases

None

FLOWatch

No in-app purchases

Questions

Is Plutocalc+ Water free?
Plutocalc+ Water costs $4.99, with no in-app purchases.
Is FLOWatch free?
FLOWatch is free to download, with no in-app purchases.
Which has better reviews, Plutocalc+ Water or FLOWatch?
FLOWatch is rated higher. Plutocalc+ Water averages 4.0 out of 5 from 1 ratings, while FLOWatch averages 5.0 from 1 ratings.
Do Plutocalc+ Water or FLOWatch have ads?
Neither Plutocalc+ Water nor FLOWatch shows ads.
Which is updated more often, Plutocalc+ Water or FLOWatch?
Plutocalc+ Water ships an update every 3 months, and FLOWatch every 3 months. Most recently, Plutocalc+ Water was updated on August 29, 2026 and FLOWatch on September 17, 2026.

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