# Green Security Gatekeeper vs MSD Event Space

The clearest difference is rating: MSD Event Space at 5.0 against Green Security Gatekeeper's 1.9. Green Security Gatekeeper's advantage is ratings volume (13 vs 1) and iOS requirement (11.1 vs 17.0). On price, update cadence, ads and in-app purchases there is nothing between them.

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

MSD Event Space holds the better App Store score, 5.0 against 1.9. That said, the two scores are not equally well evidenced: Green Security Gatekeeper has 13 ratings behind it against 1, so its average is the more settled of the two.

Green Security Gatekeeper ships an update every 6 weeks, MSD Event Space every 5 weeks. The most recent releases landed on July 7, 2026 and September 27, 2026 respectively.

## The numbers

| Metric | Green Security Gatekeeper | MSD Event Space |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.9 (13 ratings)](https://appshunter.io/ios/app/green-security-gatekeeper/id1437683422/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/msd-event-space/id6445799780/reviews)** |
| Number of ratings | **13** | 1 |
| Positive reviews | 20.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 5 weeks** |
| Monetization | Free | Free |
| Size | 2 MB | 55 MB |
| Requires iOS | **11.1** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 17+ |
| Developer | [Green Security LLC](https://appshunter.io/developer/725008709) | [Merck Sharp & Dohme LLC](https://appshunter.io/developer/718617686) |

## What reviewers say

### Green Security Gatekeeper

[App page](https://appshunter.io/ios/app/green-security-gatekeeper/id1437683422)

This app streamlines vendor and contractor management. It allows for efficient scanning and tracking of individuals entering a facility. Simplify your access control processes.

**Highlights:** Vendor scanning, Contractor management, Access control, Facility entry tracking, Streamlined processes

**Features:** macOS Compatibility

**In-app purchases:** none


### MSD Event Space

[App page](https://appshunter.io/ios/app/msd-event-space/id6445799780)

Enhance event experiences for attendees with personalized journeys, interactive engagement tools, and networking opportunities. Facilitate connections and gather insights through features like custom event pages, targeted polls, and participant matching.

**Highlights:** Personalized event pages, Timely notifications, Session search and theming, Participant matching, Built-in video calls, Interactive polls and Q&A

**In-app purchases:** none


## Frequently asked questions

### Is Green Security Gatekeeper free?

Green Security Gatekeeper is free to download, with no in-app purchases.

### Is MSD Event Space free?

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

### Which has better reviews, Green Security Gatekeeper or MSD Event Space?

MSD Event Space is rated higher. Green Security Gatekeeper averages 1.9 out of 5 from 13 ratings, while MSD Event Space averages 5.0 from 1 ratings.

### Do Green Security Gatekeeper or MSD Event Space have ads?

Neither Green Security Gatekeeper nor MSD Event Space shows ads.

### Which is updated more often, Green Security Gatekeeper or MSD Event Space?

Green Security Gatekeeper ships an update every 6 weeks, and MSD Event Space every 5 weeks. Most recently, Green Security Gatekeeper was updated on July 7, 2026 and MSD Event Space on September 27, 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.*