# Unit Converter and Calc vs Tail Number offline database

The clearest difference is ads: Tail Number offline database at none against Unit Converter and Calc's shown. Tail Number offline database also leads on rating (5.0 vs 4.8) and monetization model (free vs ad-supported). Unit Converter and Calc's advantage is ratings volume (4 vs 1). On price, in-app purchases and device support there is nothing between them.

Both are free to download. 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 4.8. Both are backed by a comparable volume of ratings — 4 and 1 respectively.

Unit Converter and Calc ships an update every 2 months, Tail Number offline database monthly. Both last shipped on October 24, 2026.

## The numbers

| Metric | Unit Converter and Calc | Tail Number offline database |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (4 ratings)](https://appshunter.io/ios/app/unit-converter-and-calc/id1617794152/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/tail-number-offline-database/id6736601525/reviews)** |
| Number of ratings | **4** | 1 |
| Positive reviews | 80.0% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | **Monthly** |
| Monetization | Ad-supported | **Free** |
| Size | 31 MB | 78 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Qtonz infosoft private limited](https://appshunter.io/developer/1548474074) | [Dan Driscoll](https://appshunter.io/developer/985477299) |

## What reviewers say

### Unit Converter and Calc

[App page](https://appshunter.io/ios/app/unit-converter-and-calc/id1617794152)

This app offers a comprehensive suite of conversion tools for everyday needs, including units of length, weight, temperature, and currency. It also functions as a scientific and arithmetic calculator, with specialized calculators for age, EMI, BMI, and more.

**Highlights:** Unit conversion for length, weight, temperature, volume, time, Scientific and arithmetic calculator, Real-time currency and cryptocurrency converter, Age, EMI, BMI, Percentage, GST calculators, History display for previous calculations, Floating calculator for multitasking

**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 Unit Converter and Calc free?

Unit Converter and Calc is free to download, 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, Unit Converter and Calc or Tail Number offline database?

Tail Number offline database is rated higher. Unit Converter and Calc averages 4.8 out of 5 from 4 ratings, while Tail Number offline database averages 5.0 from 1 ratings.

### Do Unit Converter and Calc or Tail Number offline database have ads?

Unit Converter and Calc shows ads; Tail Number offline database does not.

### Which is updated more often, Unit Converter and Calc or Tail Number offline database?

Unit Converter and Calc ships an update every 2 months, and Tail Number offline database monthly. Most recently, Unit Converter and Calc was updated on October 24, 2026 and Tail Number offline database on October 24, 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.*