Water vs PreFlight
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Water
Read full descriptionHide full description
Knowing the water content of natural gases is essential to the design and operation of production, dehydration, and transmission systems. Water may condense in production and gathering systems. Condensed water may form water slugs which will tend to decrease flow efficiency and increase the pressure drop in a line. Presence of free water in pipeline systems may also cause corrosion. If carbon dioxide and/or hydrogen sulphide are present, the gases may form carbonic acid and sulphurous acid respectively if dissolved in water. Water content calculations are based on a method developed by Campbell. The method applies the standard physical chemistry equations and the Eykman Molecular Refraction (EMR) combination rules. For water content calculations the approach here uses fugacity coefficient as one of the key factors.
PreFlight
Create and manage detailed, customizable checklists for any recurring task or preparation. This app ensures you never miss a critical step in your routines, from outdoor adventures to daily organization.
- Customizable checklists
- Master recurring tasks
- Detailed step management
- Organized preparation workflows
- Ensures no steps are missed
Read full descriptionHide full description
PreFlight is your essential checklist companion for mastering complex, recurring tasks. Whether you're preparing for a hike, planning a road trip, or tackling any multi-step routine, PreFlight ensures nothing gets overlooked. Create detailed, customizable checklists that capture every step of your process. From simple reminders to comprehensive preparation workflows, PreFlight adapts to your needs and keeps you organized. Never miss a critical step again. With PreFlight's structured approach to task management, you can confidently tackle your most important routines knowing every detail is accounted for.
Screenshots
Verdict
The clearest difference is in-app purchases: Water at none against PreFlight's 1. Water also leads on iOS requirement (15.6 vs 26.0). PreFlight's advantage is update cadence (every 2 weeks vs every 59 months). On price, ads 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
Both are free to download. PreFlight sells 1 one-off in-app purchase. Water asks for nothing beyond the download.
Water ships an update every 59 months, PreFlight every 2 weeks. Both last shipped on October 27, 2026.
| Parameter | Water | PreFlight |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (3 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 3 — better |
| Update frequency | Every 59 months | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Requires iOS | 15.6 — better | 26.0 |
| Further details — not scored | ||
| Size | 1 MB | 9 MB |
| Age rating | 17+ | 4+ |
| Developer | Bjarne Berge | AngryBoat, LLC |
In-app purchases
Water
No in-app purchases
PreFlight
- Buy a Coffee$1.99









