# Plutocalc+ Water vs Tail Number offline database

The clearest difference is price: Tail Number offline database at Free against Plutocalc+ Water's $4.99. Tail Number offline database also leads on rating (5.0 vs 4.0) and update cadence (monthly vs every 3 months). On ratings volume, ads, in-app purchases and device support there is nothing between them.

Tail Number offline database is free to download; Plutocalc+ Water costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Tail Number offline database holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

Plutocalc+ Water ships an update every 3 months, Tail Number offline database monthly. The most recent releases landed on October 14, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Plutocalc+ Water | Tail Number offline database |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | [4.0 (1 ratings)](https://appshunter.io/ios/app/plutocalc-plus-water/id1142058236/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/tail-number-offline-database/id6736601525/reviews)** |
| Number of ratings | 1 | 1 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Monthly** |
| Monetization | Paid | **Free** |
| Size | 5 MB | 78 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Daniel Peig](https://appshunter.io/developer/1142058235) | [Dan Driscoll](https://appshunter.io/developer/985477299) |

## What reviewers say

### Plutocalc+ Water

[App page](https://appshunter.io/ios/app/plutocalc-plus-water/id1142058236)

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:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Tail Number offline database

[App page](https://appshunter.io/ios/app/tail-number-offline-database/id6736601525)

Access a comprehensive database of aircraft registration information without needing an internet connection. Track the planes you observe in the sky with this offline utility.

**Highlights:** Offline aircraft database, FAA registration lookup, Transport Canada registration lookup, Track seen aircraft, No internet required

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Plutocalc+ Water free?

Plutocalc+ Water costs $4.99, with no in-app purchases.

### Is Tail Number offline database free?

Tail Number offline database is free to download, with no in-app purchases.

### Which has better reviews, Plutocalc+ Water or Tail Number offline database?

Tail Number offline database is rated higher. Plutocalc+ Water averages 4.0 out of 5 from 1 ratings, while Tail Number offline database averages 5.0 from 1 ratings.

### Do Plutocalc+ Water or Tail Number offline database have ads?

Neither Plutocalc+ Water nor Tail Number offline database shows ads.

### Which is updated more often, Plutocalc+ Water or Tail Number offline database?

Plutocalc+ Water ships an update every 3 months, and Tail Number offline database monthly. Most recently, Plutocalc+ Water was updated on October 14, 2026 and Tail Number offline database on October 7, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*