# PDB Viewer vs OpenBat

The clearest difference is in-app purchases: OpenBat at none against PDB Viewer's 1. OpenBat also leads on update cadence (every 4 days vs monthly). PDB Viewer's advantage is iOS requirement (16.0 vs 18.0). On price, ads and device support there is nothing between them.

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

PDB Viewer ships an update monthly, OpenBat every 4 days. The most recent releases landed on November 10, 2026 and November 13, 2026 respectively.

## The numbers

| Metric | PDB Viewer | OpenBat |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Monthly | **Every 4 days** |
| Size | 2 MB | 52 MB |
| Requires iOS | **16.0** | 18.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 17+ |
| Developer | [Qvyshift LLC](https://appshunter.io/developer/1536442361) | [Niall Bell](https://appshunter.io/developer/1884697412) |

## 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 |


### OpenBat

[App page](https://appshunter.io/ios/app/openbat/id6787886621)

**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 OpenBat free?

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

### Do PDB Viewer or OpenBat have ads?

Neither PDB Viewer nor OpenBat shows ads.

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

PDB Viewer ships an update monthly, and OpenBat every 4 days. Most recently, PDB Viewer was updated on November 10, 2026 and OpenBat on November 13, 2026.

---

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