Plutocalc+ Water vs SolidGuide
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 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
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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
SolidGuide
This app provides water treatment professionals with quick access to product information and essential calculators for cooling tower, boiler, and closed-loop systems. It features a user-friendly catalog, equipment details, intelligent surveys, and searchable resources like spec sheets and drawings.
- User-friendly product catalog
- Comprehensive equipment information
- Intelligent surveys
- Upgraded calculators
- Searchable resources (spec sheets, drawings, case studies)
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SolidGuide, powered by AP Tech, is a valuable resource for water treatment professionals, designed to streamline access to AP Tech solid chemistry product information and calculators for cooling tower, boiler, and closed-loop applications. With SolidGuide 2.0, you will experience a smooth experience and refined resources, including: • User-friendly Product Catalog • Comprehensive equipment information • Intelligent and seamless surveys • Calculators with upgraded functionality • Searchable resources (spec sheets, drawings, case studies, and more) • Eliminate the guesswork and get SolidGuide.
Screenshots
Verdict
The clearest difference is price: SolidGuide at Free against Plutocalc+ Water's $4.99. SolidGuide also leads on rating (5.0 vs 4.0) and update cadence (every 6 weeks vs every 3 months). Plutocalc+ Water's advantage is iOS requirement (12.0 vs 15.0). 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
SolidGuide is free to download; Plutocalc+ Water costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.
SolidGuide holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 1 and 3 respectively.
Plutocalc+ Water ships an update every 3 months, SolidGuide every 6 weeks. The most recent releases landed on August 29, 2026 and June 5, 2026 respectively.
| Parameter | Plutocalc+ Water | SolidGuide |
|---|---|---|
| Price | $4.99 | Free — better |
| Rating | 4.0 (1 ratings) | 5.0 (3 ratings) — better |
| Number of ratings | 1 | 3 — better |
| Update frequency | Every 3 months | Every 6 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 4 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | Daniel Peig | APTech Group |
Customer experience
Plutocalc+ Water
SolidGuide
In-app purchases
Plutocalc+ Water
No in-app purchases
SolidGuide
No in-app purchases
Questions
Is Plutocalc+ Water free?
Is SolidGuide free?
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