# O.R. Billing vs CathDoc

The clearest difference is update cadence: CathDoc at every 3 weeks against O.R. Billing's every 3 months. CathDoc also leads on device support (3 vs 1). On price, ads, in-app purchases and iOS requirement there is nothing between them.

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

O.R. Billing ships an update every 3 months, CathDoc every 3 weeks. The most recent releases landed on June 9, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | O.R. Billing | CathDoc |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 3 weeks** |
| Size | 19 MB | 12 MB |
| Requires iOS | 16.0 | **15.6** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [Communicans LLC](https://appshunter.io/developer/1712216986) | [Lumen Innovations, LLC](https://appshunter.io/developer/1489598636) |

## What reviewers say

### O.R. Billing

[App page](https://appshunter.io/ios/app/or-billing/id6469745828)

**Features:** macOS Compatibility

**In-app purchases:** none


### CathDoc

[App page](https://appshunter.io/ios/app/cathdoc/id6757081293)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is O.R. Billing free?

O.R. Billing is free to download, with no in-app purchases.

### Is CathDoc free?

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

### Do O.R. Billing or CathDoc have ads?

Neither O.R. Billing nor CathDoc shows ads.

### Which is updated more often, O.R. Billing or CathDoc?

O.R. Billing ships an update every 3 months, and CathDoc every 3 weeks. Most recently, O.R. Billing was updated on June 9, 2026 and CathDoc on September 18, 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.*