# Nautical Signal Code Flags vs Atomic Spectra

The clearest difference is device support: Atomic Spectra at 4 against Nautical Signal Code Flags's 2. Nautical Signal Code Flags's advantage is iOS requirement (13.2 vs 26.0). On price, update cadence, ads and in-app purchases there is nothing between them.

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

Nautical Signal Code Flags ships an update every 30 months, Atomic Spectra every 19 months. The most recent releases landed on September 12, 2026 and August 31, 2026 respectively.

## The numbers

| Metric | Nautical Signal Code Flags | Atomic Spectra |
| --- | --- | --- |
| Price | $1.99 | $1.99 |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/atomic-spectra/id6444901660/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 30 months | **Every 19 months** |
| Monetization | — | Paid |
| Size | 10 MB | 7 MB |
| Requires iOS | **13.2** | 26.0 |
| Devices | iPad, Apple TV | **iPhone, iPad, Mac, Apple TV** |
| Age rating | 4+ | 4+ |
| Developer | [Ventura Educational Systems](https://appshunter.io/developer/371324172) | [Jim Haungs](https://appshunter.io/developer/1498282259) |

## What reviewers say

### Nautical Signal Code Flags

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

**Features:** macOS Compatibility

**In-app purchases:** none


### Atomic Spectra

[App page](https://appshunter.io/ios/app/atomic-spectra/id6444901660)

This reference app provides detailed information on strong line atomic emission spectra within the visible range. Users can search for elements by name, symbol, or atomic number and inspect individual spectra lines. It offers interactive features to visualize and navigate spectral data.

**Highlights:** Visible range spectra (380-740nm), Search by element name, symbol, or atomic number, Sort by name, symbol, or spectra line count, Inspect individual spectra lines, Interactive spectrum visualization

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Nautical Signal Code Flags free?

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

### Is Atomic Spectra free?

Atomic Spectra costs $1.99, with no in-app purchases.

### Do Nautical Signal Code Flags or Atomic Spectra have ads?

Neither Nautical Signal Code Flags nor Atomic Spectra shows ads.

### Which is updated more often, Nautical Signal Code Flags or Atomic Spectra?

Nautical Signal Code Flags ships an update every 30 months, and Atomic Spectra every 19 months. Most recently, Nautical Signal Code Flags was updated on September 12, 2026 and Atomic Spectra on August 31, 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.*