# HKCOS eLogBook vs MSD E

The clearest difference is update cadence: MSD E at every 5 weeks against HKCOS eLogBook's every 4 months. HKCOS eLogBook's advantage is iOS requirement (9.3 vs 11.0). 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.

HKCOS eLogBook ships an update every 4 months, MSD E every 5 weeks. The most recent releases landed on October 18, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | HKCOS eLogBook | MSD E |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 5 weeks** |
| Size | 21 MB | 45 MB |
| Requires iOS | **9.3** | 11.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Hong Kong College of Orthopaedic Surgeons, THE](https://appshunter.io/developer/1472723546) | [Deverhood HT Co.,Ltd.](https://appshunter.io/developer/1785579550) |

## What reviewers say

### HKCOS eLogBook

[App page](https://appshunter.io/ios/app/hkcos-elogbook/id1472723547)

**Features:** macOS Compatibility

**In-app purchases:** none


### MSD E

[App page](https://appshunter.io/ios/app/msd-e-logbook/id6502573447)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is HKCOS eLogBook free?

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

### Is MSD E free?

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

### Do HKCOS eLogBook or MSD E have ads?

Neither HKCOS eLogBook nor MSD E shows ads.

### Which is updated more often, HKCOS eLogBook or MSD E?

HKCOS eLogBook ships an update every 4 months, and MSD E every 5 weeks. Most recently, HKCOS eLogBook was updated on October 18, 2026 and MSD E on October 5, 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.*