# ChargeSpectrum vs CathDoc

The clearest difference is update cadence: CathDoc at every 3 weeks against ChargeSpectrum's every 5 months. ChargeSpectrum's advantage is iOS requirement (13.0 vs 15.6). On price, ads, in-app purchases and device support there is nothing between them.

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

ChargeSpectrum ships an update every 5 months, CathDoc every 3 weeks. The most recent releases landed on September 12, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | ChargeSpectrum | CathDoc |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 3 weeks** |
| Size | 32 MB | 12 MB |
| Requires iOS | **13.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Clinicspectrum, Inc.](https://appshunter.io/developer/932413384) | [Lumen Innovations, LLC](https://appshunter.io/developer/1489598636) |

## What reviewers say

### ChargeSpectrum

[App page](https://appshunter.io/ios/app/chargespectrum/id1004943613)

**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 ChargeSpectrum free?

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

### Is CathDoc free?

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

### Do ChargeSpectrum or CathDoc have ads?

Neither ChargeSpectrum nor CathDoc shows ads.

### Which is updated more often, ChargeSpectrum or CathDoc?

ChargeSpectrum ships an update every 5 months, and CathDoc every 3 weeks. Most recently, ChargeSpectrum was updated on September 12, 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.*