PassFinder vs Science
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PassFinder
Track the International Space Station's visible passes over your location. Receive precise timing information to observe the ISS with the naked eye.
- ISS pass tracking
- Visible pass notifications
- Naked-eye observation guidance
- Location-based timing
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See the International Space Station as it passes overhead! You'll get that chance by knowing exactly when the ISS is going to pass over your location and is visible to the naked eye.
Science
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Take a REAL 3D Solar System tour: - Solar System Preview 3D - Solar System Walk 3D 3D TV and 3D glasses requires. Turn on your TV Side-by-Side mode to see 3D! Live 3D solar system model lets see how the Planets revolve around the Sun. Every movement is based on real speed. Every planet has extensive information: mass, radius, orbital velocity , temperature range and basic information.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | PassFinder | Science |
|---|---|---|
| Price | Free — better | $0.99 |
| Rating | 3.1 (30 ratings) — better | — |
| Positive reviews | 39.0% of reviews | — |
| Number of ratings | 30 — better | — |
| Update frequency | Every 3 months — better | Every 27 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad — better | Apple TV |
| Requires iOS | 18.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 5 MB | 23 MB |
| Age rating | 4+ | 4+ |
| Developer | Christian Hansen | Illés László |
In-app purchases
PassFinder
No in-app purchases
Science
No in-app purchases
