Gravity! vs Black hole finder
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Gravity!
Simulate the forces of gravity by flinging particles and observing their interactions. Create celestial bodies like planets and black holes, and customize their properties. Explore vast cosmic simulations with intuitive zoom and pan controls.
- Gravity simulation
- Particle interaction
- Create solar systems
- Add black holes
- Adjust particle properties
- Zoom and pan controls
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This app simulates the effects of gravity. You can fling particles at each other and watch them interact. Create solar systems and galaxies! Make a planet and fling asteroids into it! Add a black hole and watch everything get sucked in! You can adjust the size, mass, and color of the particles! Zoom in and out and look around with two fingers! App Preview Music: "Mesmerizing Galaxy " Kevin MacLeod (incompetech.com) Licensed under Creative Commons: By Attribution 4.0 License http://creativecommons.org/licenses/by/4.0/
Black hole finder
Contribute to cutting-edge astronomical research by identifying potential black holes and rare elements. Sift through real-time telescope images to detect fleeting light signals from cosmic events and potentially earn co-authorship on scientific publications.
- Analyze real-time telescope images
- Detect light signals from cosmic events
- Contribute to scientific research
- Potential co-authorship on publications
- Learn about black holes and neutron star mergers
- Direct telescopes for additional measurements
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Welcome to the Black Hole Finder, an exciting citizen science project dedicated to discovering black holes, particularly those formed from the fusion of two neutron stars. You have the unique opportunity to contribute to this cutting-edge research from the comfort of your home, using your phone, tablet, or computer. Our app brings the cosmos to your fingertips. When two neutron stars merge, they create a powerful event, sending gravitational waves through space. These events are detected by our gravitational wave detectors, which alert us to potential black hole formations. Mergers of this kind not only create black holes but also give birth to rare Earth elements such as Iodine, Gold, and Cerium. All these elements, especially Iodine, play crucial roles in supporting life as we know it. In addition to gravitational waves, these cosmic collisions emit light signals. The chase is on to detect these signals with our trio of specially designed BlackGEM telescopes located in Chile. The catch is that the detectors only provide a general localization of the event and the light signals are fleeting. Therefore, we need to act quickly to capture these signals before they fade away after a few days or a week at most. That's where you come in! Using our app, you will sift through real-time images of the sky taken by our BlackGEM telescopes. You will help us spot these light signals, effectively identifying potential new black holes. Not only will you be possibly among the first to set eyes on the light from these celestial events, but with some training, you may also direct telescopes to take additional measurements of intriguing objects. Your contributions to science won't go unnoticed. Participants who make significant discoveries will be offered co-authorship on scientific publications that result from their findings. We also provide training and guidance to enrich your understanding of the cosmos. The Black Hole Finder project is not just about making significant scientific contributions. It's about engaging with the wonders of the universe, learning about the intricate processes that drive its dynamics, and having fun while doing it! So, join us on this thrilling journey of discovery and exploration. Download the Black Hole Finder app now and start your cosmic adventure!
Screenshots
Verdict
The clearest difference is in-app purchases: Black hole finder at none against Gravity!'s 1. Black hole finder also leads on update cadence (every 10 days vs every 2 months) and iOS requirement (13.0 vs 15.6). Gravity!'s advantage is review sentiment (74% vs 63%). On price, rating, ratings volume and ads 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. Gravity! sells 1 one-off in-app purchase. Black hole finder asks for nothing beyond the download.
Black hole finder holds the better App Store score, 4.1 against 3.9. Both are backed by a comparable volume of ratings — 18 and 7 respectively. Written reviews complicate that: 74% of Gravity!'s written reviews are positive against 63% of Black hole finder's, so the app with the better star average is not the one people write more warmly about.
Gravity! ships an update every 2 months, Black hole finder every 10 days. The most recent releases landed on October 20, 2026 and October 24, 2026 respectively.
| Parameter | Gravity! | Black hole finder |
|---|---|---|
| Price | Free | Free |
| Rating | 3.9 (18 ratings) | 4.1 (7 ratings) — better |
| Positive reviews | 73.5% of reviews — better | 62.5% of reviews |
| Number of ratings | 18 — better | 7 |
| Update frequency | Every 2 months | Every 10 days — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 13.0 — better |
| Further details — not scored | ||
| Size | 17 MB | 81 MB |
| Age rating | 4+ | 4+ |
| Developer | Marc Davis | DDQ |
Customer experience
Gravity!
Black hole finder
In-app purchases
Gravity!
- Gravity! Extended Edition$0.99
Black hole finder
No in-app purchases








