# Isotope Browser vs Reaction Thermodynamics

The clearest difference is price: Isotope Browser at Free against Reaction Thermodynamics's $3.99. Isotope Browser also leads on update cadence (every 6 weeks vs every 4 months) and iOS requirement (11.0 vs 17.0). On ads, in-app purchases and device support there is nothing between them.

Isotope Browser is free to download; Reaction Thermodynamics costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Isotope Browser ships an update every 6 weeks, Reaction Thermodynamics every 4 months. The most recent releases landed on November 6, 2026 and July 7, 2026 respectively.

## The numbers

| Metric | Isotope Browser | Reaction Thermodynamics |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | **[4.8 (27 ratings)](https://appshunter.io/ios/app/isotope-browser/id943890538/reviews)** | — |
| Number of ratings | **27** | — |
| Positive reviews | 82.6% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 6 weeks** | Every 4 months |
| Monetization | Free | — |
| Size | 8 MB | 1 MB |
| Requires iOS | **11.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [IAEA](https://appshunter.io/developer/535500126) | [Roman Volinsky](https://appshunter.io/developer/977951850) |

## What reviewers say

### Isotope Browser

[App page](https://appshunter.io/ios/app/isotope-browser/id943890538)

Access comprehensive nuclear data for over 4,000 nuclides and isomers. Explore interactive charts, filter by various criteria, and view detailed information for each nuclide. Data is sourced from reliable resources and available offline.

**Highlights:** Properties of over 4,000 nuclides and isomers, Interactive Chart of Nuclides, Periodic Table of Elements, Filter by half-life, decay mode, radiation type, and energy, Detailed nuclide information with web links, Offline access to embedded database

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

**In-app purchases:** none


### Reaction Thermodynamics

[App page](https://appshunter.io/ios/app/reaction-thermodynamics/id1090321476)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Isotope Browser free?

Isotope Browser is free to download, with no in-app purchases.

### Is Reaction Thermodynamics free?

Reaction Thermodynamics costs $3.99, with no in-app purchases.

### Do Isotope Browser or Reaction Thermodynamics have ads?

Neither Isotope Browser nor Reaction Thermodynamics shows ads.

### Which is updated more often, Isotope Browser or Reaction Thermodynamics?

Isotope Browser ships an update every 6 weeks, and Reaction Thermodynamics every 4 months. Most recently, Isotope Browser was updated on November 6, 2026 and Reaction Thermodynamics on July 7, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*