# Universe Size Comparison vs Nautical Signal Code Flags

The clearest difference is update cadence: Universe Size Comparison at every 4 months against Nautical Signal Code Flags's every 30 months. Nautical Signal Code Flags's advantage is iOS requirement (13.2 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Universe Size Comparison costs $1.99 and Nautical Signal Code Flags $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Universe Size Comparison ships an update every 4 months, Nautical Signal Code Flags every 30 months. The most recent releases landed on October 9, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Universe Size Comparison | Nautical Signal Code Flags |
| --- | --- | --- |
| Price | $1.99 | $1.99 |
| Rating | **[3.1 (29 ratings)](https://appshunter.io/ios/app/universe-size-comparison/id1473946290/reviews)** | — |
| Number of ratings | **29** | — |
| Positive reviews | 70.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 30 months |
| Monetization | Paid | — |
| Size | 413 MB | 10 MB |
| Requires iOS | 17.0 | **13.2** |
| Devices | **iPhone, iPad, Apple TV** | iPad, Apple TV |
| Age rating | +4 | 4+ |
| Developer | [Daniele Citi](https://appshunter.io/developer/1187632258) | [Ventura Educational Systems](https://appshunter.io/developer/371324172) |

## What reviewers say

### Universe Size Comparison

[App page](https://appshunter.io/ios/app/universe-size-comparison/id1473946290)

Explore the vastness of space and understand celestial body dimensions through interactive 3D comparisons. Discover the scale of planets and stars, from our Sun to hypergiant stars, with guided tours and free comparison modes.

**Highlights:** 3D astronomical comparisons, Tour Mode with guided explanations, Free Mode for custom comparisons, Scale comparisons of planets and stars, Detailed celestial body information, Elegant user interface

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

**In-app purchases:** none


### Nautical Signal Code Flags

[App page](https://appshunter.io/ios/app/nautical-signal-code-flags/id1598190434)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Universe Size Comparison free?

Universe Size Comparison costs $1.99, with no in-app purchases.

### Is Nautical Signal Code Flags free?

Nautical Signal Code Flags costs $1.99, with no in-app purchases.

### Do Universe Size Comparison or Nautical Signal Code Flags have ads?

Neither Universe Size Comparison nor Nautical Signal Code Flags shows ads.

### Which is updated more often, Universe Size Comparison or Nautical Signal Code Flags?

Universe Size Comparison ships an update every 4 months, and Nautical Signal Code Flags every 30 months. Most recently, Universe Size Comparison was updated on October 9, 2026 and Nautical Signal Code Flags on October 16, 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.*