# Atom (Site Engineer) vs OneApp (OCG)

Atom (Site Engineer) and OneApp (OCG) are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Both ship on a similar rhythm, roughly fortnightly. Both last shipped on September 10, 2026.

## The numbers

| Metric | Atom (Site Engineer) | OneApp (OCG) |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Fortnightly | Fortnightly |
| Size | 51 MB | 39 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Saphire Computers Limited](https://appshunter.io/developer/1164805098) | [RGE SERVICES LIMITED](https://appshunter.io/developer/1801780124) |

## What reviewers say

### Atom (Site Engineer)

[App page](https://appshunter.io/ios/app/atom-site-engineer/id6449485838)

**Features:** Vision Pro support

**In-app purchases:** none


### OneApp (OCG)

[App page](https://appshunter.io/ios/app/oneapp-ocg/id6743174237)

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

**In-app purchases:** none


## Frequently asked questions

### Is Atom (Site Engineer) free?

Atom (Site Engineer) is free to download, with no in-app purchases.

### Is OneApp (OCG) free?

OneApp (OCG) is free to download, with no in-app purchases.

### Do Atom (Site Engineer) or OneApp (OCG) have ads?

Neither Atom (Site Engineer) nor OneApp (OCG) shows ads.

### Which is updated more often, Atom (Site Engineer) or OneApp (OCG)?

Atom (Site Engineer) ships an update fortnightly, and OneApp (OCG) fortnightly. Most recently, Atom (Site Engineer) was updated on September 10, 2026 and OneApp (OCG) on September 10, 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.*