# ISS World Expo vs NPSA Events

The clearest difference is ads: NPSA Events at none against ISS World Expo's shown. ISS World Expo's advantage is update cadence (every 4 weeks vs every 3 months) and iOS requirement (15.1 vs 17.0). On price, 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.

ISS World Expo ships an update every 4 weeks, NPSA Events every 3 months. The most recent releases landed on September 11, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | ISS World Expo | NPSA Events |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Every 4 weeks** | Every 3 months |
| Size | 66 MB | 65 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Informa Exhibitions U.S. Construction and Real Estate, Inc.](https://appshunter.io/developer/1281092345) | [National Portable Storage Asso](https://appshunter.io/developer/1617077710) |

## What reviewers say

### ISS World Expo

[App page](https://appshunter.io/ios/app/iss-world-expo/id1569063496)

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

**In-app purchases:** none


### NPSA Events

[App page](https://appshunter.io/ios/app/npsa-events/id1617077708)

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

**In-app purchases:** none


## Frequently asked questions

### Is ISS World Expo free?

ISS World Expo is free to download, with no in-app purchases.

### Is NPSA Events free?

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

### Do ISS World Expo or NPSA Events have ads?

ISS World Expo shows ads; NPSA Events does not.

### Which is updated more often, ISS World Expo or NPSA Events?

ISS World Expo ships an update every 4 weeks, and NPSA Events every 3 months. Most recently, ISS World Expo was updated on September 11, 2026 and NPSA Events on September 16, 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.*