Fluid Pressure Drop vs Moody Chart Calculator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Fluid Pressure Drop
Calculate fluid transmission energy loss for industrial applications. Choose from common fluids, pipe schedules, and materials to determine pressure loss. Supports custom fluids and includes calculations for valves and fittings.
- Pressure loss computation
- Custom fluid creation
- Valve and fitting loss calculation
- Multiple fluid options
- Various pipe schedules and materials
- Unit of measurement selection
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This app computes energy loss involved in transmission of fluids for industrial applications. Users can pick from a list of fifteen most common fluids, pipe schedules and sizes with different material of construction to determine overall pressure loss. A judicious selection of pipe size is often a trade off between initial cost and subsequent energy cost involved in transmission of fluid from one point to another. Therefore, the app can be a helpful tool for practicing engineers and designers in analyzing different matrix. In addition, fluids that are not in the list, users can create a custom fluid with property data that can be saved and compute the pressure loss using the model provided in this app. Pressure loss is computed using Darcy’s equation, which gives a good estimate for both liquid and gases. For gases, the method is valid if the fluid velocity is within 40% of its sonic velocity. Also this app provides result of different flow parameters used in the computation of pressure loss. Section has been added for computation of pressure losses in valves and fittings. Users can choose any generic valve or fitting from the list provided in this app that are commonly used in industries. List of fluids: Air, Steam, Water, Nitrogen, Oxygen, Hydrogen, Helium, CO2, Methane, Ethane, Chlorine, Ammonia, Argon, Hydraulic oil, HFC (R410A), Custom (user's choice gas or liquid). Pipe Schedules: 10, 20, 30, 40, 60, 80, 100, 120, 140, 160. Users can pick applicable sizes under nominal diameter for which app provides the corresponding inside and outside diameter. Material of construction: Steel, SS, GI, CI, Concrete, Copper, Aluminum, PVC, Glass, Wood, FRP, Rubber. Based on the size, length and material of construction, the app gives the total weight of the pipe for trade-off analysis. Valves and Fittings: Globe valve, Gate valve, Ball valve, Butterfly valve, Angle valve, Check-valve, Check-angle, Check-lift. Elbow, Reducer, Diffuser, T-couple, Bend-U, Bend-45, Bend-90. Flow Parameters: Fluid velocity, Reynolds number and pipe friction coefficient are computed as a function of pipe size, fluid density and viscosity. App has its own algorithm to compute the coefficient of pipe friction based on roughness factor for the given material and Reynolds number under turbulent conditions. For laminar flow, it is a function of Reynolds number and irrespective of pipe roughness. For more accuracy users can edit the pipe roughness factor. For gases, additional data on sonic velocity is provided for a quick reference and validity. Unit of Measurement: Users can choose different unit of measurement for both flow as well as pressure drop under given unit standard (SI or USCS). This can be conveniently selected while choosing the fluid from the picker list as shown in the screen shots.
Moody Chart Calculator
This utility app calculates a friction factor based on Reynolds Number and Relative Roughness. It provides a straightforward tool for engineering calculations.
- Friction factor calculation
- Reynolds Number input
- Relative Roughness input
- Engineering utility
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The long-awaited Moody Chart Calculator is finally on the App Store! Calculate the Darcy friction factor instantly from Reynolds Number and Relative Roughness — no more squinting at a printed chart or interpolating by eye. Whether you're a student, a practicing engineer, or just need a fast, reliable friction factor, Moody Chart Calculator delivers accurate results in seconds. Features: Basic and Pro calculation modes Save formulas to custom collections Review your full calculation history Covers laminar, transitional, and turbulent flow Built by an engineer, for engineers. Download now and get back to solving real problems. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is price: Moody Chart Calculator at Free against Fluid Pressure Drop's $4.99. Moody Chart Calculator also leads on ratings volume (6 vs 1). Fluid Pressure Drop's advantage is in-app purchases (none vs 1) and update cadence (every 12 months vs every 57 months). On rating, ads, device support and iOS requirement 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
Moody Chart Calculator is free to download; Fluid Pressure Drop costs $4.99 up front. Moody Chart Calculator sells 1 in-app purchase, starting at $1.99 per month. Fluid Pressure Drop asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 5.0 for Fluid Pressure Drop against 5.0 for Moody Chart Calculator. That said, the two scores are not equally well evidenced: Moody Chart Calculator has 6 ratings behind it against 1, so its average is the more settled of the two.
Fluid Pressure Drop ships an update every 12 months, Moody Chart Calculator every 57 months. The most recent releases landed on November 6, 2026 and November 2, 2026 respectively.
| Parameter | Fluid Pressure Drop | Moody Chart Calculator |
|---|---|---|
| Price | $4.99 | Free — better |
| Rating | 5.0 (1 ratings) | 5.0 (6 ratings) |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | 1 | 6 — better |
| Update frequency | Every 12 months — better | Every 57 months |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 14.3 — better | 15.1 |
| Further details — not scored | ||
| Size | 1 MB | 49 MB |
| Age rating | 4+ | 4+ |
| Developer | Kaup Shenoy Associates | Ali Batayneh |
Customer experience
Fluid Pressure Drop
Moody Chart Calculator
In-app purchases
Fluid Pressure Drop
No in-app purchases
Moody Chart Calculator
- Pro Monthly7 Days trial$1.991 Month
Questions
Is Fluid Pressure Drop free?
Is Moody Chart Calculator free?
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