X vs ASTC
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
X
Explore the solar system, Earth's atmosphere, and its structure with engaging audio and video content. This app offers an entertaining and educational journey for all ages, created by a team of experts.
- Audio guides for Solar System Trail
- On-demand content
- Audio and video on Earth's atmosphere
- Content on Earth's structure
- Solar System exploration
- Expert-created content
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Use the free Audio Guides and add another dimension to the Solar System Trail walk or enjoy the on-demand content. The App offers audio and video content about The Atmosphere, The Structure of the Earth and The Solar System. It is the collaborative work of scientists, writers, space artists and voice actors. Its aim is to deliver fun, entertaining and educational content to suit younger and older users alike. Get a new perspective as you go on a journey across the Solar System, fly to the top of the Atmosphere or descend on a Journey to the Center of the Earth.
ASTC
Enhance your conference experience by accessing schedules, speaker details, and exhibitor information. Take notes directly on presentation slides in real-time and share insights with attendees via in-app messaging, tweeting, or email.
- View conference schedule
- Access speaker and exhibitor details
- Take real-time notes on slides
- Draw directly on presentation slides
- In-app messaging with attendees
- Share information via tweet/email
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The ASTC Events mobile application allows you to view the schedule, presentations, exhibitors, and speaker details from the conference. Users can take notes adjacent to the presentation slides real time during presentations and draw and highly directly on the slides inside the app. Note-taking is also available in the posters and exhibitors pages as well. Additionally, users can share information with attendees and colleagues with the in app messaging feature, tweeting, and emailing.
Screenshots
Verdict
The clearest difference is rating: ASTC at 4.7 against X's 1.3. ASTC also leads on in-app purchases (none vs 10) and ratings volume (36 vs 3). X's advantage is update cadence (every 3 months vs every 11 months) and iOS requirement (13.4 vs 15.5). On price, review sentiment, ads and monetization model 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
Both are free to download. X sells 10 one-off in-app purchases. ASTC asks for nothing beyond the download.
ASTC holds the better App Store score, 4.7 against 1.3. That said, the two scores are not equally well evidenced: ASTC has 36 ratings behind it against 3, so its average is the more settled of the two. Written reviews split almost evenly too, at 0% and 0% positive.
X ships an update every 3 months, ASTC every 11 months. The most recent releases landed on October 6, 2026 and October 16, 2026 respectively.
| Parameter | X | ASTC |
|---|---|---|
| Price | Free | Free |
| Rating | 1.3 (3 ratings) | 4.7 (36 ratings) — better |
| Positive reviews | 0.0% of reviews | 0.0% of reviews |
| Number of ratings | 3 | 36 — better |
| Update frequency | Every 3 months — better | Every 11 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free | Free |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 13.4 — better | 15.5 |
| Further details — not scored | ||
| Size | 47 MB | 87 MB |
| Age rating | 4+ | 4+ |
| Developer | Roni Waserman | ASSOCIATION OF SCIENCE-TECHNOLOGY CENTERS, INC. |
Customer experience
X
ASTC
In-app purchases
X
- A Comet's Journey$0.99
- Journey To The Centre Of Earth$0.99
- A Mission To Mars$0.99
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- A Mission To The ISS$0.99
- A Voyage To Saturn$0.99
- Solar System Experience$0.99
- The World Under Our Feet$0.99
- Tour The Atmosphere$0.99
- When Dinosaurs Moved$0.99
- Moons Of The Solar System$0.99
ASTC
No in-app purchases
