Compressible Gas Flow Calc vs Field Operator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Compressible Gas Flow Calc
Calculates pressure drops and flow rates for compressible gas flow in pipes. Offers three modes: calculate inlet pressure, outlet pressure, or flow rate. Supports custom pipe sizes and a database of over 20 gases.
- Calculate inlet pressure
- Calculate outlet pressure
- Calculate flow rate
- Standard and custom pipe sizes
- Database of 20+ gases
- Imperial or SI units
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This app does one thing, but it does it well. It will calculate the pressure drops and flow rates for compressible gas flow in a pipe. This app is different from other pressure drop apps in that it does not restrict the results to a certain pressure drop, which treat it as a liquid. There are 3 calculation modes that can be used: -Calculate inlet pressure: This is useful when the user knows they need to deliver a certain amount of a gas against a certain back pressure. Such as filling a tank or vessel. -Calculate outlet pressure: This will determine the residual pressure in the gas at the end of a pipe run. -Calculate flow rate: Not much to be said here, enter the pressures and you get the flow rate. We have used this to calculate free flow of high pressure lines, for example if there is a break in a line (outlet pressure is zero). App includes a full database of standard pipe sizes or you can enter your own size using the Custom selection. There are over 20 gases in the database with viscosity as a function of temperature using Lennard-Jones formulation. Results are based on a modified Newton-Raphson iterative method and have been benchmarked against CFD results. Choose between Imperial or SI units.
Field Operator
This app streamlines remote oil and gas operations by enabling field operators to capture and manage data from hundreds of wells and equipment. It facilitates quick data validation, image capture, and seamless collaboration between field teams and the back office.
- Field data capture
- Operations management
- Remote well management
- Equipment management
- Image capture
- Team collaboration
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Field Operator combines P2’s industry leading field data capture and operations management software with mobile capabilities to help field operators in their daily challenges of remote oil and gas operations with hundreds of wells and equipment to manage. The solution enables quick data validation, capture of images and seamless collaboration from the field to the back office.
Screenshots
Verdict
The clearest difference is price: Field Operator at Free against Compressible Gas Flow Calc's $3.99. Field Operator also leads on update cadence (every 2 months vs every 12 months) and iOS requirement (9.0 vs 15.6). Compressible Gas Flow Calc's advantage is rating (5.0 vs 4.5). 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
Field Operator is free to download; Compressible Gas Flow Calc costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Compressible Gas Flow Calc holds the better App Store score, 5.0 against 4.5. Both are backed by a comparable volume of ratings — 1 and 2 respectively.
Compressible Gas Flow Calc ships an update every 12 months, Field Operator every 2 months. Both last shipped on October 11, 2026.
| Parameter | Compressible Gas Flow Calc | Field Operator |
|---|---|---|
| Price | $3.99 | Free — better |
| Rating | 5.0 (1 ratings) — better | 4.5 (2 ratings) |
| Number of ratings | 1 | 2 — better |
| Update frequency | Every 12 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 15.6 | 9.0 — better |
| Further details — not scored | ||
| Size | 1 MB | 104 MB |
| Age rating | 4+ | 4+ |
| Developer | Niagara Mobile LLC | P2 Energy Solutions |
Customer experience
Compressible Gas Flow Calc
Field Operator
In-app purchases
Compressible Gas Flow Calc
No in-app purchases
Field Operator
No in-app purchases







