Your Android observatory with real-time sky view, AR, telescope control, and the only astronomy app that computes your local horizon from topographic data.
Recommended for new users. Start with the freemium app and unlock premium later with a subscription or one-time purchase.
Prefer paying once up front? Get Mobile Observatory Pro on Google Play. The same lifetime premium access is also available later inside Mobile Observatory.
Everything you need for astronomy, in your pocket
Point your phone and identify stars, planets, and constellations live
Explore planets, moons, and comets in an interactive orrery
ISS passes, Starlink trains, and 10,000+ satellites in real-time
2,500+ nebulae, galaxies, and star clusters with photos and details
50+ event types including eclipses, conjunctions, occultations, transits, and more
Aurora alerts, solar flares, ISS passes, and event reminders
Aurora forecast, Kp-index, solar flares, and NASA SDO images
Phases, eclipses, lunar features, sunspot data, and rise/set times
Real terrain profiles from NASA data for precise rise/set times
Auto-generated session plans based on your equipment and location
Connect your GoTo telescope and slew to any object with a single tap
Hipparcos, SAO, and extended catalogs with detailed star data
See Mobile Observatory in action
From first launch to expert observer
Point your phone at the sky and see stars, planets, and the Sun's path over your real 3D terrain.
Browse upcoming conjunctions, eclipses, ISS passes, and thousands of celestial objects with detailed data.
Generate optimized observing plans, control your telescope, and log your observations like a pro.
Scroll through real app screens β tap to enlarge






Because Karma damage is so unforgiving, getting hit twice in a row is usually fatal. Focus on mastering the first 60 seconds of the fight perfectly so you enter the chaotic final phases with full health.
What truly sets VHS Sans apart from countless other fan-made Sans variants is his visual design. As his name implies, the character is heavily inspired by the degradation and glitchiness of old VHS tapes. In fan art and animations, his design frequently incorporates tracking lines, static effects, and visual distortions that mimic a damaged magnetic tape. This "analog horror" aesthetic gives him a distinctly creepy and uncanny presence, making him feel like a being corrupted not just by code, but by decaying, outdated technology itself. As his battles intensify, his appearance becomes more distorted, with his eyes beginning to melt and his mouth stretching downwards, enhancing the horror.
This simulator brings to life an unsettling, horror-infused version of the iconic Sans boss battle, wrapped in a grainy, analog-horror aesthetic. For players seeking an intense mechanical challenge or fans obsessed with deep Undertale lore, this simulator delivers an unforgettable experience. What is VHS Sans?
As the menu lingers on screen, the audio devolves into a cacophony of tape hiss and static. The sound is both familiar and disorienting, like listening to a worn-out VHS tape on a broken player. The distortion effect on the screen intensifies, causing the pixels to swirl and writhe like a living thing. vhs sans fight simulator
The enduring popularity of the VHS Sans Fight Simulator lies in its ability to subvert expectations. Fans who have played the original Genocide Route hundreds of times find themselves completely lost in the atmospheric dread of the VHS variant. It transforms a familiar mechanical challenge into a genuinely unsettling horror experience, proving that the Undertale community's appetite for innovation is far from over.
| Simulator | Difficulty | Glitch Mechanics | Lore Focus | Average Playtime | | :--- | :--- | :--- | :--- | :--- | | | Hard | None (pure skill) | Low | 10-20 min | | Dusttale Fight Sim | Very Hard | None | Medium | 15-25 min | | VHS Sans Fight Sim | Extreme | Heavy (core mechanic) | High | 5-15 min (repeat attempts) | | Last Breath Sans | Brutal | Minimal | Medium | 20-30 min |
This piece combines the nostalgia of VHS tapes with the fast-paced action of a fight simulator, adding a dash of glitchy, distorted flair. The result is a dreamlike, futuristic world where the boundaries between code and reality blur. Because Karma damage is so unforgiving, getting hit
Did we miss your favorite version of the VHS Sans fight simulator? Let us know in the comments below. And rememberβdo not try to MERCY the static. It never works.
Moreover, the simulator serves as a form of creative expression and community engagement. Players share their experiences, strategies, and achievements on social media platforms and gaming forums, fostering a sense of community among fans.
This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Canβt copy the link right now. Try again later. As his name implies, the character is heavily
Active community support and regular updates can enhance the longevity of the game, with new content, characters, or game modes being added based on player feedback and demand.
Undertale fan-games have taken the "bullet hell" mechanics of the original game and pushed them to agonizing, creative new heights. Among these, few have left as terrifying a legacy as the .
What sets VHS Sans Fight Simulator apart from other fighting games is its commitment to delivering a retro experience that's both nostalgic and fresh. The game's unique aesthetic, coupled with its accessible yet challenging gameplay, appeals to a broad audience. Whether you're a seasoned gamer looking for a casual challenge or a retro game enthusiast eager to relive the past, VHS Sans Fight Simulator offers something for everyone.
Tools for astronomers, astrophotographers, and anyone who looks up
Explore the solar system in an interactive 3D view
Track the ISS, Starlink, and thousands more
Point your camera and explore the sky
Real-time aurora and solar activity dashboard
Personalized recommendations for your location
Massive astronomical database at your fingertips
Plan your observing sessions in advance
Detailed Sun and Moon information
Fresh 5-star feedback from astronomers around the world
"The update to version 4 brings several interesting graphical and functional improvements. It's incredibly realistic; the horizon profile at your observation location allows for more precise calculations of star rises and sets. The 3D view has been significantly improved, with updated graphics for the well-rendered planets, and every astronomical event is faithfully reproduced. A full 5 stars for this beautiful app, an indispensable tool for both amateur and professional astronomers."
"If you're wondering which special objects are in the constellation you're looking at right now, and when they can best be observed, then this app is exactly right for you. I've tried just about every astronomy app out there. My conclusion: by far the most valuable app for amateur astronomers who want to explore the night sky themselves with their own telescope."
"This app is simply fantastic and keeps getting better. It offers a huge variety of features, making it the most professional app in the Play Store."
"Version 4 is amazing: intelligently programmed, very well organized. Thank you for this excellent work!"
New users should begin with the freemium app, then unlock premium inside the app when they are ready. If you prefer buying up front, Mobile Observatory Pro remains available as the classic paid edition.
Recommended for all new users
Classic paid edition for users who prefer a separate upfront purchase
The story behind Mobile Observatory
Creator of Mobile Observatory
Wolfgang Zima spent years as a professional astronomer before finding his way into software development. After completing his PhD in Astronomy at the University of Vienna, he worked as a postdoctoral researcher at the Institute for Astronomy at KU Leuven in Belgium for five years. It was there that he discovered a passion for scientific software β writing tools for analyzing spectra of pulsating stars and building a CCD image simulator for ESA's PLATO mission, a space telescope searching for Earth-like exoplanets.
Mobile Observatory started almost by accident: when his Nokia phone broke on a mountain biking trip in late 2010, Wolfgang got his first Android phone and was surprised that no good astronomy apps existed. So he built one. First released in January 2011, Mobile Observatory has since grown into one of the most comprehensive astronomy apps for Android and has been continuously improved for well over a decade.
Wolfgang lives in Freiburg, Germany, where he works as a Senior Mobile Developer at sevdesk. He continues to develop Mobile Observatory with the same enthusiasm as on day one β now with the help of modern AI tools that let him bring new features to life faster than ever.
Because Karma damage is so unforgiving, getting hit twice in a row is usually fatal. Focus on mastering the first 60 seconds of the fight perfectly so you enter the chaotic final phases with full health.
What truly sets VHS Sans apart from countless other fan-made Sans variants is his visual design. As his name implies, the character is heavily inspired by the degradation and glitchiness of old VHS tapes. In fan art and animations, his design frequently incorporates tracking lines, static effects, and visual distortions that mimic a damaged magnetic tape. This "analog horror" aesthetic gives him a distinctly creepy and uncanny presence, making him feel like a being corrupted not just by code, but by decaying, outdated technology itself. As his battles intensify, his appearance becomes more distorted, with his eyes beginning to melt and his mouth stretching downwards, enhancing the horror.
This simulator brings to life an unsettling, horror-infused version of the iconic Sans boss battle, wrapped in a grainy, analog-horror aesthetic. For players seeking an intense mechanical challenge or fans obsessed with deep Undertale lore, this simulator delivers an unforgettable experience. What is VHS Sans?
As the menu lingers on screen, the audio devolves into a cacophony of tape hiss and static. The sound is both familiar and disorienting, like listening to a worn-out VHS tape on a broken player. The distortion effect on the screen intensifies, causing the pixels to swirl and writhe like a living thing.
The enduring popularity of the VHS Sans Fight Simulator lies in its ability to subvert expectations. Fans who have played the original Genocide Route hundreds of times find themselves completely lost in the atmospheric dread of the VHS variant. It transforms a familiar mechanical challenge into a genuinely unsettling horror experience, proving that the Undertale community's appetite for innovation is far from over.
| Simulator | Difficulty | Glitch Mechanics | Lore Focus | Average Playtime | | :--- | :--- | :--- | :--- | :--- | | | Hard | None (pure skill) | Low | 10-20 min | | Dusttale Fight Sim | Very Hard | None | Medium | 15-25 min | | VHS Sans Fight Sim | Extreme | Heavy (core mechanic) | High | 5-15 min (repeat attempts) | | Last Breath Sans | Brutal | Minimal | Medium | 20-30 min |
This piece combines the nostalgia of VHS tapes with the fast-paced action of a fight simulator, adding a dash of glitchy, distorted flair. The result is a dreamlike, futuristic world where the boundaries between code and reality blur.
Did we miss your favorite version of the VHS Sans fight simulator? Let us know in the comments below. And rememberβdo not try to MERCY the static. It never works.
Moreover, the simulator serves as a form of creative expression and community engagement. Players share their experiences, strategies, and achievements on social media platforms and gaming forums, fostering a sense of community among fans.
This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Canβt copy the link right now. Try again later.
Active community support and regular updates can enhance the longevity of the game, with new content, characters, or game modes being added based on player feedback and demand.
Undertale fan-games have taken the "bullet hell" mechanics of the original game and pushed them to agonizing, creative new heights. Among these, few have left as terrifying a legacy as the .
What sets VHS Sans Fight Simulator apart from other fighting games is its commitment to delivering a retro experience that's both nostalgic and fresh. The game's unique aesthetic, coupled with its accessible yet challenging gameplay, appeals to a broad audience. Whether you're a seasoned gamer looking for a casual challenge or a retro game enthusiast eager to relive the past, VHS Sans Fight Simulator offers something for everyone.