# Thermochemistry vs Atomic Spectra

The clearest difference is update cadence: Thermochemistry at every 4 months against Atomic Spectra's every 19 months. Thermochemistry also leads on iOS requirement (17.0 vs 26.0). Atomic Spectra's advantage is price ($1.99 vs $3.99) and device support (4 vs 2). On ads and in-app purchases there is nothing between them.

Thermochemistry costs $3.99 and Atomic Spectra $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Thermochemistry ships an update every 4 months, Atomic Spectra every 19 months. The most recent releases landed on October 24, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | Thermochemistry | Atomic Spectra |
| --- | --- | --- |
| Price | $3.99 | **$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 4 months** | Every 19 months |
| Monetization | — | Paid |
| Size | 1 MB | 7 MB |
| Requires iOS | **17.0** | 26.0 |
| Devices | iPhone, iPad | **iPhone, iPad, Mac, Apple TV** |
| Age rating | 4+ | 4+ |
| Developer | [Roman Volinsky](https://appshunter.io/developer/977951850) | [Jim Haungs](https://appshunter.io/developer/1498282259) |

## What reviewers say

### Thermochemistry

[App page](https://appshunter.io/ios/app/thermochemistry/id1095024444)

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

**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 Thermochemistry free?

Thermochemistry costs $3.99, with no in-app purchases.

### Is Atomic Spectra free?

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

### Do Thermochemistry or Atomic Spectra have ads?

Neither Thermochemistry nor Atomic Spectra shows ads.

### Which is updated more often, Thermochemistry or Atomic Spectra?

Thermochemistry ships an update every 4 months, and Atomic Spectra every 19 months. Most recently, Thermochemistry was updated on October 24, 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.*