# Periodic vs Atomic Spectra

The clearest difference is update cadence: Periodic at every 5 weeks against Atomic Spectra's every 19 months. Periodic also leads on iOS requirement (15.1 vs 26.0). On price, ads, in-app purchases and device support there is nothing between them.

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

Periodic ships an update every 5 weeks, Atomic Spectra every 19 months. The most recent releases landed on August 16, 2026 and August 31, 2026 respectively.

## The numbers

| Metric | Periodic | 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 5 weeks** | Every 19 months |
| Monetization | — | Paid |
| Size | 31 MB | 7 MB |
| Requires iOS | **15.1** | 26.0 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, Mac, Apple TV** |
| Age rating | 4+ | 4+ |
| Developer | [Om Prakash Chapagain](https://appshunter.io/developer/1618620262) | [Jim Haungs](https://appshunter.io/developer/1498282259) |

## What reviewers say

### Periodic

[App page](https://appshunter.io/ios/app/periodic-table-elements-pro/id1628646759)

**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 Periodic free?

Periodic costs $1.99, with no in-app purchases.

### Is Atomic Spectra free?

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

### Do Periodic or Atomic Spectra have ads?

Neither Periodic nor Atomic Spectra shows ads.

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

Periodic ships an update every 5 weeks, and Atomic Spectra every 19 months. Most recently, Periodic was updated on August 16, 2026 and Atomic Spectra on August 31, 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.*