Comparison

Celestial Simulation vs Signal Ark

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

Head to head
About

Celestial Simulation

Features
Read full description

Celestial Simulation Experience the universe as it truly moves. Celestial Simulation is a high-fidelity, physics-based app that lets you explore and understand celestial motion through real simulations—not animations or guesses. Every event is driven by time, location, and real celestial mechanics. From eclipses and planetary motion to lunar occultations and chaotic three-body dynamics, the app turns complex astronomy into intuitive, visual experiences. Observer-Based Simulation Your location matters. Set your observing position on Earth and watch how celestial events change with latitude, longitude, and time. Every simulation adapts instantly to your chosen place and moment. Solar System Geometry Explore the mechanics of the inner solar system: - Annular and hybrid solar eclipses with umbra and antumbra geometry - Planetary conjunctions and minimum angular separations - Mercury and Venus elongations for optimal visibility - Retrograde motion visualized over days and weeks - Transits of Mercury and Venus across the solar disk Most simulations are continuous and time-accurate. Lunar Occultations See how the Moon moves through the sky: - Occultations of bright stars and planets - Local and global visibility bands - Geometry that explains why an event is visible from certain locations Three-Body Dynamics Go beyond classical orbits and explore real gravitational complexity: - Circular Restricted Three-Body Problem (CR3BP) - Lagrange points L1–L5 with stability insights - Chaotic motion in non-rotating frames - Extreme sensitivity to initial conditions - These simulations reveal how real spaceflight dynamics and celestial chaos work. Special Focus: Total Solar Eclipse 2026 (Europe) A total solar eclipse will cross Europe in 2026 — a rare and unforgettable event. Celestial Simulation lets you explore the full path of totality, simulate eclipse geometry from different locations, and understand how timing and position affect what you will see. Use the simulation to: - Compare observing locations across Europe - Visualize eclipse paths and shadow motion - Plan where and when to experience totality Whether you are preparing a journey or simply exploring the mechanics behind the event, the app helps you understand why the eclipse unfolds the way it does. Built for Exploration - Interactive time control - Clean, focused visualizations - Designed for learners, enthusiasts, and curious minds - No clutter, no gimmicks—just the universe in motion Celestial Simulation is a pocket laboratory for understanding how the sky actually works. Whether you’re learning, teaching, or simply fascinated by celestial mechanics, this app lets you see the physics behind the beauty.

About

Signal Ark

Explore cosmic radio signals and learn about radio astronomy. Analyze signal packages, track anomalies, and build your own exploration archive. Discover the science behind searching the cosmos.

Highlights
  • Cosmic radio signal exploration
  • Signal package analysis
  • SETI-inspired lessons
  • Waterfall spectrograms
  • Cosmic journal for notes
  • Radio signal sonification
Features
Read full description

Signal Ark puts cosmic radio signal exploration in your hands. WHAT IS SIGNAL ARK? Signal Ark is a SETI-inspired educational app for exploring radio astronomy concepts, signal packages, waterfall spectrograms, anomaly scores, drift rates, RFI probability, SNR values, and the scientific method behind cosmic listening. SIGNAL VAULT Browse curated signal packages inspired by radio astronomy workflows. Each package includes information such as target name, frequency band, observation date, source context, and a waterfall-style visualization. SETI ACADEMY Learn the foundations of cosmic signal analysis through structured lessons. Discover how radio telescopes work, why humans search the cosmos, what makes a candidate signal interesting, how interference is identified, and why every anomaly requires validation. COSMIC JOURNAL Save signals that catch your attention, write notes, and build your own exploration archive. SOUND LIBRARY Explore radio signal sonifications and learn how scientific data can be represented through sound. SCIENTIFIC INTEGRITY Signal Ark never labels a signal as extraterrestrial. Interesting does not mean alien. Every candidate requires independent verification and scientific validation. PREMIUM ACCESS Some content and features require an optional auto-renewable Monthly Access subscription. Payment is charged through your Apple Account. The subscription renews automatically unless canceled through your Apple Account subscription settings. PRIVACY FIRST No advertising or behavioral tracking. Signal Ark uses anonymous app identifiers and does not require your name, location, or personal profile. Privacy Policy: https://signal-ark.space/privacy.html Terms of Use (EULA): https://signal-ark.space/terms.html

Screenshots

Celestial Simulation4 screens
Signal Ark4 screens

Verdict

The call

The clearest difference is price: Signal Ark at Free against Celestial Simulation's $3.99. Celestial Simulation's advantage is in-app purchases (none vs 1). On ads, device support and iOS requirement 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

Signal Ark is free to download; Celestial Simulation costs $3.99 up front. Signal Ark sells 1 in-app purchase, starting at $6.99 per month. Celestial Simulation asks for nothing beyond the download.

Scorecard2 real differences · 7 level
Celestial Simulation versus Signal Ark: the parameters behind the verdict, then further details
ParameterCelestial SimulationSignal Ark
Price$3.99Free — better
Rating—5.0 (1 ratings) — better
Number of ratings—1 — better
Update frequency—Monthly
AdsNoNo
In-app purchasesNo — betterYes
Monetization—Freemium
DevicesiPhone, iPadiPhone, iPad
Requires iOS18.517.0 — better
Further details — not scored
Size88 MB54 MB
Age rating4+4+
DeveloperDung LeJean Marc Moro

In-app purchases

None

Celestial Simulation

No in-app purchases

1 purchases

Signal Ark

Subscriptions1
  • Monthly Access3 Days trial$6.991 Month

Questions

Is Celestial Simulation free?
Celestial Simulation costs $3.99, with no in-app purchases.
Is Signal Ark free?
Signal Ark is free to download, with in-app purchases available.
Do Celestial Simulation or Signal Ark have ads?
Neither Celestial Simulation nor Signal Ark shows ads.

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