Black hole simulator with real physics controls. Schwarzschild radius, tidal force thresholds, time dilation — all adjustable. Sandbox mode runs without internet, which matters. UI is clean enough on Pixel 6a, Android 13. Sliders for mass and density feel precise. Gravitational lensing toggle works as advertised. Main gripe: no way …
EventHole App
3.67 (3 reviews)On this page
Reviewed by
Ludis.app Team
Published
Jun 15, 2026
Updated
Jun 15, 2026
EventHole is an offline black hole physics simulator that puts the most extreme objects in the universe directly in your hands. It's built for curious minds — students, space enthusiasts, and anyone who's ever wondered what happens when matter falls past the point of no return. The app works without an internet connection and offers enough depth to keep you experimenting long after the first run.
Screens and Views
Inside the Simulator
EventHole centers on a single, genuinely difficult subject — the physics of black holes — and builds a hands-on environment around it. Rather than just reading about event horizons and Schwarzschild radii, you configure them. The Generator screen lets you dial in mass on a scale from micro to supermassive, and the app responds with a live spacetime curvature preview along with calculated values like Schwarzschild radius and temperature in scientific notation. It's the kind of immediate feedback that turns abstract equations into something you can actually feel.
What You're Working With
- An Object Spawner that lets you create rocks, metal, gas, light, planets, and ships — each with adjustable mass, density, temperature, and structural strength
- A Lab and Experiments section where you place objects near named black holes like Cygnus X-1, toggle gravitational lensing and space grid overlays, and run simulations at adjustable time scales
- Relativistic effects including light bending and time dilation, observable during experiments
- Visualizations, graphs, and logs for analyzing what happened — and why
- A sandbox mode that encourages replaying scenarios with different physical constants
- Educational content organized into beginner, intermediate, and advanced tiers, covering black hole types, event horizon basics, and Hawking radiation
The Interface Up Close
The visual design leans into deep crimson gradients, particle effects, and 3D-rendered space elements — a dramatic aesthetic that suits the subject. Navigation runs through five consistent bottom tabs: Lab, Generator, Objects, Experiments, and More. Sliders carry precise numerical readouts, and contextual help text explains concepts like tidal forces directly beneath the relevant controls. That said, the app uses heavy red/green color coding throughout, and users with color vision differences may find some state indicators ambiguous without additional context cues.
A Note on Tone
EventHole lands closest to a physics sandbox rather than a course — it rewards tinkering over reading, and the replayability of the experiment mode is where most of the long-term value lives.
The Pull of a Void
There's something in EventHole's visual language — the deep crimson backgrounds, the electric particle trails, the circular black void at the center of each simulation — that echoes the atmosphere of space-themed games built around tension and gravity. The same sense of a single, inescapable center pulling everything toward it. If you're drawn to that kind of visual intensity in interactive experiences, EventHole channels it toward something with real scientific grounding underneath.
App Technical Details
Platform
iOS
Internet connection required
No — fully offline simulator
Navigation sections
5 tabs: Lab, Generator, Objects, Experiments, More
Spawnable object types
6 — Rock, Metal, Gas, Light, Planet, Ship
Simulated relativistic effects
Light bending and time dilation
Educational difficulty levels
3 — Beginner, Intermediate, Advanced
Analysis output formats
Visualizations, graphs, and logs
Sandbox mode
Yes
| Platform | iOS |
| Internet connection required | No — fully offline simulator |
| Navigation sections | 5 tabs: Lab, Generator, Objects, Experiments, More |
| Spawnable object types | 6 — Rock, Metal, Gas, Light, Planet, Ship |
| Simulated relativistic effects | Light bending and time dilation |
| Educational difficulty levels | 3 — Beginner, Intermediate, Advanced |
| Analysis output formats | Visualizations, graphs, and logs |
| Sandbox mode | Yes |
EventHole Explained
Does EventHole require an internet connection to use?
No, EventHole is a fully offline simulator, so all experiments and physics explorations run without any internet connection required.
What types of objects can I spawn in the simulation?
The Object Spawner offers six object types: Rock, Metal, Gas, Light, Planet, and Ship. Each can be customized with sliders for mass, density, temperature, and structural strength before being added to the simulation.
What relativistic effects does EventHole let me observe?
EventHole lets you observe relativistic effects including gravitational lensing (light bending) and time dilation. Gravitational lensing can be toggled on or off directly in the experiment setup screen.
Is there educational content for users new to black hole physics?
Yes, the app includes a knowledge section with content organized into three difficulty levels — beginner, intermediate, and advanced — covering topics such as black hole types, the event horizon, and the Schwarzschild radius.
Can I adjust the speed and visual settings of an experiment?
Yes, each experiment includes a Time Scale slider to control simulation speed, and you can toggle options like gravitational lensing, Show Grid, and Space Grid on or off before running the experiment.
Reviews (3)
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Also, ich hab EventHole jetzt irgendwie ein paar Wochen lang benutzt und, ich weiß gar nicht, ich fand es am Anfang total verwirrend, weil es so viele Regler und Einstellungen gibt, und ich hab mich gefragt, wo fange ich überhaupt an, also, was ist das hier eigentlich genau? Dann hab …
8 replies
lena_fragt: Support irgendwie schwer zu erreichen ist?
Support ist tatsächlich ein Problem. Fragen bleiben oft unbeantwortet. Ansonsten: solide App.
lena_fragt: wo fange ich überhaupt an
Die Grundidee ist gut — ein Simulator, der echte relativistische Effekte zeigt, ohne dass man dafür einen Physikabschluss braucht. Was mich stört ist, dass die Navigation früher intuitiver wirkte; in der aktuellen Version muss man sich erst durch fünf Reiter kämpfen, bevor man überhaupt ein Experiment starten kann. Das Potenzial ist da, aber die Oberfläche versteckt es gründlich. Ich frage mich, ob die Entwickler die Nutzerfeedback-Schleifen wirklich ernstnehmen.
Markus_Freiburg: durch fünf Reiter kämpfen
iPhone 15 Pro, iOS 17.4. Experiment-Tab braucht drei Taps zu viel. Sandbox-Modus startet aber flüssig, keine Lags.
Ay, qué app tan curiosa la que me he encontrado esta semana... EventHole llegó a mi teléfono casi por accidente, buscando algo para entender mejor los agujeros negros después de ver un documental, y la verdad es que no esperaba que fuera TAN completa 💫 Lo primero que me enamoró …
7 replies
Marisol_GDL: es como tener un laboratorio de física relativista en el bolsillo
La simulación funciona bien - eso hay que admitirlo. Llevo años buscando algo así para el móvil. Lo de ajustar las constantes físicas no es un detalle menor - es lo que separa esto de una simple animación educativa. Dicho esto - la interfaz tiene demasiados sliders para manejar con comodidad en pantallas pequeñas. Cinco controles deslizantes en una sola pantalla es demasiado para los dedos de cualquiera.
Coincido con lo del exceso de sliders (cinco parámetros simultáneos en el Object Spawner es objetivamente mucho para una pantalla de 6 pulgadas), pero técnicamente la app está bien construida. Los cálculos del radio de Schwarzschild se actualizan en tiempo real al mover el slider de masa, lo cual no es trivial de implementar sin lag perceptible. El modo offline también funciona sin problemas, algo que valoro porque no siempre tengo conexión estable. La sección de experimentos guarda logs de cada simulación, lo que permite comparar resultados entre distintas configuraciones. Para una app de física, eso es exactamente lo que necesitas.
Marisol_GDL: me hubiera gustado un tutorial interactivo que te guíe desde el principio
Yo la descargué porque mi hijo mayor está dando física en el instituto y andaba buscando algo que le ayudara a visualizar estos conceptos 🔭 La verdad es que se lo pasó en grande lanzando objetos al agujero negro, jaja. Lo de los niveles de conocimiento (principiante, intermedio, avanzado) nos vino muy bien porque yo entendí algo en el nivel básico y él se fue directo al avanzado. Eso sí, le doy la razón a Marisol en que al principio cuesta orientarse sin un tutorial claro 😅 Un saludo a todos.
