# Displacement Reaction vs Atomic Spectra

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

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

Displacement Reaction ships an update every 33 months, Atomic Spectra every 19 months. Both last shipped on October 27, 2026.

## The numbers

| Metric | Displacement Reaction | 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 | 150 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

### Displacement Reaction

[App page](https://appshunter.io/ios/app/displacement-reaction/id1544602964)

**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 Displacement Reaction free?

Displacement Reaction costs $1.99, with no in-app purchases.

### Is Atomic Spectra free?

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

### Do Displacement Reaction or Atomic Spectra have ads?

Neither Displacement Reaction nor Atomic Spectra shows ads.

### Which is updated more often, Displacement Reaction or Atomic Spectra?

Displacement Reaction ships an update every 33 months, and Atomic Spectra every 19 months. Most recently, Displacement Reaction was updated on October 27, 2026 and Atomic Spectra on October 27, 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.*