# PDB Viewer vs Elemlearn

The clearest difference is in-app purchases: Elemlearn at none against PDB Viewer's 1. Elemlearn also leads on update cadence (every 9 days vs monthly). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. PDB Viewer sells 1 one-off in-app purchase. Elemlearn asks for nothing beyond the download.

PDB Viewer ships an update monthly, Elemlearn every 9 days. The most recent releases landed on October 14, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | PDB Viewer | Elemlearn |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Monthly | **Every 9 days** |
| Size | 2 MB | 27 MB |
| Requires iOS | 16.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Qvyshift LLC](https://appshunter.io/developer/1536442361) | [Adrien Soullier](https://appshunter.io/developer/6789115736) |

## What reviewers say

### PDB Viewer

[App page](https://appshunter.io/ios/app/pdb-viewer-3d-molecules/id6777468488)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PDB Viewer Pro | $9.99 | one-time |


### Elemlearn

[App page](https://appshunter.io/ios/app/elemlearn-element-quiz/id6790116323)

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

**In-app purchases:** none


## Frequently asked questions

### Is PDB Viewer free?

PDB Viewer is free to download, with in-app purchases available.

### Is Elemlearn free?

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

### Do PDB Viewer or Elemlearn have ads?

Neither PDB Viewer nor Elemlearn shows ads.

### Which is updated more often, PDB Viewer or Elemlearn?

PDB Viewer ships an update monthly, and Elemlearn every 9 days. Most recently, PDB Viewer was updated on October 14, 2026 and Elemlearn on October 8, 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.*