# Stoichiometry vs Atomic Spectra

The clearest difference is review sentiment: Atomic Spectra at 100% against Stoichiometry's 50%. Atomic Spectra also leads on device support (4 vs 2) and price ($1.99 vs $2.99). Stoichiometry's advantage is update cadence (every 2 months vs every 19 months) and iOS requirement (17.1 vs 26.0). On ads, in-app purchases and monetization model there is nothing between them.

Stoichiometry costs $2.99 and Atomic Spectra $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Stoichiometry ships an update every 2 months, Atomic Spectra every 19 months. The most recent releases landed on October 9, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | Stoichiometry | Atomic Spectra |
| --- | --- | --- |
| Price | $2.99 | **$1.99** |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/atomic-spectra/id6444901660/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | 50.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 19 months |
| Monetization | Paid | Paid |
| Size | 1 MB | 7 MB |
| Requires iOS | **17.1** | 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

### Stoichiometry

[App page](https://appshunter.io/ios/app/stoichiometry/id1330949637)

This tool helps balance chemical reactions and calculate molar masses, moles, and actual masses of reactants and products. It supports various formula formats and can identify limiting reagents. Data can be sent to another app for gas phase calculations.

**Highlights:** Balance chemical reactions, Calculate molar masses, Determine moles and actual masses, Identify limiting reagents, Supports various formula formats, Integrates with Gas Phase Stoichiometry app

**Features:** 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 Stoichiometry free?

Stoichiometry costs $2.99, with no in-app purchases.

### Is Atomic Spectra free?

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

### Do Stoichiometry or Atomic Spectra have ads?

Neither Stoichiometry nor Atomic Spectra shows ads.

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

Stoichiometry ships an update every 2 months, and Atomic Spectra every 19 months. Most recently, Stoichiometry was updated on October 9, 2026 and Atomic Spectra on September 30, 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.*