Comparison

Gravity! vs Black hole finder

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Gravity simulation
  • Particle interaction
  • Create solar systems
  • Add black holes
  • Adjust particle properties
  • Zoom and pan controls
Features
Read full description

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/

About

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.

Highlights
  • 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
Features
Read full description

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

Gravity!4 screens
Black hole finder2 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Gravity! sells 1 one-off in-app purchase. Black hole finder asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard5 real differences · 5 level
Gravity! versus Black hole finder: the parameters behind the verdict, then further details
ParameterGravity!Black hole finder
PriceFreeFree
Rating3.9 (18 ratings)4.1 (7 ratings) — better
Positive reviews73.5% of reviews — better62.5% of reviews
Number of ratings18 — better7
Update frequencyEvery 2 monthsEvery 10 days — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.613.0 — better
Further details — not scored
Size17 MB81 MB
Age rating4+4+
DeveloperMarc DavisDDQ

Customer experience

Gravity!

All ratings18 ratings
Positive72.2%
Neutral5.6%
Negative22.2%
Written reviews34 reviews
Positive73.5%
Neutral8.8%
Negative17.6%

Black hole finder

All ratings7 ratings
Positive85.7%
Neutral0.0%
Negative14.3%
Written reviews8 reviews
Positive62.5%
Neutral0.0%
Negative37.5%

In-app purchases

1 purchases

Gravity!

One-time1
  • Gravity! Extended Edition$0.99
None

Black hole finder

No in-app purchases

Questions

Is Gravity! free?
Gravity! is free to download, with in-app purchases available.
Is Black hole finder free?
Black hole finder is free to download, with no in-app purchases.
Which has better reviews, Gravity! or Black hole finder?
Black hole finder is rated higher. Gravity! averages 3.9 out of 5 from 18 ratings, while Black hole finder averages 4.1 from 7 ratings.
Do Gravity! or Black hole finder have ads?
Neither Gravity! nor Black hole finder shows ads.
Which is updated more often, Gravity! or Black hole finder?
Gravity! ships an update every 2 months, and Black hole finder every 10 days. Most recently, Gravity! was updated on October 20, 2026 and Black hole finder on October 24, 2026.

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