# Combination & Decomposition vs Atomic Spectra

The clearest difference is iOS requirement: Combination & Decomposition at 11.0 against Atomic Spectra's 26.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Combination & Decomposition costs $1.99 and Atomic Spectra $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Combination & Decomposition ships an update every 33 months, Atomic Spectra every 19 months. The most recent releases landed on September 9, 2026 and August 31, 2026 respectively.

## The numbers

| Metric | Combination & Decomposition | 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 33 months | **Every 19 months** |
| Monetization | — | Paid |
| Size | 149 MB | 7 MB |
| Requires iOS | **11.0** | 26.0 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, Mac, Apple TV** |
| Age rating | 4+ | 4+ |
| Developer | [VIRTUAL FILAMENTS PRIVATE LIMITED](https://appshunter.io/developer/1474217212) | [Jim Haungs](https://appshunter.io/developer/1498282259) |

## What reviewers say

### Combination & Decomposition

[App page](https://appshunter.io/ios/app/combination-and-decomposition/id1544403959)

**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 Combination & Decomposition free?

Combination & Decomposition costs $1.99, with no in-app purchases.

### Is Atomic Spectra free?

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

### Do Combination & Decomposition or Atomic Spectra have ads?

Neither Combination & Decomposition nor Atomic Spectra shows ads.

### Which is updated more often, Combination & Decomposition or Atomic Spectra?

Combination & Decomposition ships an update every 33 months, and Atomic Spectra every 19 months. Most recently, Combination & Decomposition was updated on September 9, 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.*