# PassFinder vs Science

The clearest difference is price: PassFinder at Free against Science's $0.99. PassFinder also leads on update cadence (every 3 months vs every 27 months). Science's advantage is iOS requirement (13.0 vs 18.0). On ads, in-app purchases and device support there is nothing between them.

PassFinder is free to download; Science costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

PassFinder ships an update every 3 months, Science every 27 months. The most recent releases landed on October 20, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | PassFinder | Science |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | **[3.1 (30 ratings)](https://appshunter.io/ios/app/passfinder/id721125800/reviews)** | — |
| Number of ratings | **30** | — |
| Positive reviews | 39.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 27 months |
| Monetization | Free | — |
| Size | 5 MB | 23 MB |
| Requires iOS | 18.0 | **13.0** |
| Devices | **iPhone, iPad** | Apple TV |
| Age rating | 4+ | 4+ |
| Developer | [Christian Hansen](https://appshunter.io/developer/721033532) | [Illés László](https://appshunter.io/developer/316890672) |

## What reviewers say

### PassFinder

[App page](https://appshunter.io/ios/app/passfinder/id721125800)

Track the International Space Station's visible passes over your location. Receive precise timing information to observe the ISS with the naked eye.

**Highlights:** ISS pass tracking, Visible pass notifications, Naked-eye observation guidance, Location-based timing

**Features:** macOS Compatibility

**In-app purchases:** none


### Science

[App page](https://appshunter.io/ios/app/science-solarsystem/id1054480020)

**In-app purchases:** none


## Frequently asked questions

### Is PassFinder free?

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

### Is Science free?

Science costs $0.99, with no in-app purchases.

### Do PassFinder or Science have ads?

Neither PassFinder nor Science shows ads.

### Which is updated more often, PassFinder or Science?

PassFinder ships an update every 3 months, and Science every 27 months. Most recently, PassFinder was updated on October 20, 2026 and Science on September 15, 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.*