# Atomic Spectra vs Physics Formula Library by CS

The clearest difference is price: Physics Formula Library by CS at Free against Atomic Spectra's $1.99. Physics Formula Library by CS also leads on update cadence (every 6 months vs every 19 months) and iOS requirement (18.4 vs 26.0). Atomic Spectra's advantage is in-app purchases (none vs 1) and ads (none vs shown).

Physics Formula Library by CS is free to download; Atomic Spectra costs $1.99 up front. Physics Formula Library by CS sells 1 one-off in-app purchase. Atomic Spectra asks for nothing beyond the download.

Atomic Spectra ships an update every 19 months, Physics Formula Library by CS every 6 months. The most recent releases landed on September 30, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | Atomic Spectra | Physics Formula Library by CS |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| 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** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 19 months | **Every 6 months** |
| Monetization | Paid | — |
| Size | 7 MB | 10 MB |
| Requires iOS | 26.0 | **18.4** |
| Devices | **iPhone, iPad, Mac, Apple TV** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Jim Haungs](https://appshunter.io/developer/1498282259) | [ChatStick Company Limited](https://appshunter.io/developer/1165816085) |

## What reviewers say

### 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


### Physics Formula Library by CS

[App page](https://appshunter.io/ios/app/physics-formula-library-by-cs/id6752376666)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock All Features | $1.99 | one-time |


## Frequently asked questions

### Is Atomic Spectra free?

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

### Is Physics Formula Library by CS free?

Physics Formula Library by CS is free to download, with in-app purchases available.

### Do Atomic Spectra or Physics Formula Library by CS have ads?

Physics Formula Library by CS shows ads; Atomic Spectra does not.

### Which is updated more often, Atomic Spectra or Physics Formula Library by CS?

Atomic Spectra ships an update every 19 months, and Physics Formula Library by CS every 6 months. Most recently, Atomic Spectra was updated on September 30, 2026 and Physics Formula Library by CS on October 20, 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.*