Phys. Lab vs Solar System
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Phys. Lab
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This app simulates primary and secondary school physics experiments, allowing users to understand the basic principles and usage methods of physical experiments through interactive simulation operations. It facilitates the learning, understanding, and review of physical principles, making it suitable for primary and secondary school students and physics enthusiasts to learn and comprehend physics knowledge. It can also be used for classroom teaching demonstrations by teachers and for leisure and entertainment during breaks. The simulated experiments include: 1. Vernier Caliper: Simulates measuring the outer diameter, inner diameter, hole depth, and length of a nut. 2. Balance: Simulates measuring the mass of cherries, rings, and diamonds. 3. Equilibrium of Two Forces: Measures the magnitude and direction of two forces in equilibrium using two spring balances, demonstrating Newton's Third Law. 4. Equilibrium of Three Forces: Measures the magnitude and direction of three forces in equilibrium using three spring balances, demonstrating the parallelogram law of force composition and decomposition. 5. Newton's Second Law: Measures the acceleration of uniformly accelerated linear motion using a 50 Hz punching timer, demonstrating Newton's Second Law. 6. Mechanical Resonance: Demonstrates the resonance principle through the resonance of pendulums with different string lengths. 7. Reflection and Refraction of Light: Demonstrates the laws of reflection and refraction of light by measuring the reflection and refraction angles of lasers with different frequencies in different media. 8. Convex Lens Imaging: Demonstrates the imaging principle of a convex lens by measuring the distances of real and virtual images, the distance of the candle flame, the heights of the real and virtual images, and the height of the candle flame. 9. Ohm's Law: Demonstrates Ohm's Law and Kirchhoff's Voltage and Current Laws by measuring the voltage and current in series circuits, parallel circuits, series-parallel mixed circuits, as well as short circuits and open circuits. The screen supports pinch-to-zoom gestures for easy measurement and observation.
Solar System
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The whole Solar System, in motion, in your pocket. Watch eight planets sweep around the Sun in a live orrery, tap any world to open its full profile, and finally see how big — and how far apart — everything really is. Most space apps hand you a flat diagram or a wall of text. SolarMap gives you a moving map you can actually play with: pause the orbits, speed them up, then jump straight into real NASA and ESA figures for diameter, mass, gravity, day length, year length, mean temperature and moon count. Every world, every number and every photo is stored inside the app, so it all works with the phone in airplane mode. WHAT YOU GET - See all eight planets orbiting the Sun at true relative speeds, with pause and speed controls - Open a deep profile for 14 bodies — the Sun, every planet, Pluto, Ceres, the Moon, Titan and Europa - Compare worlds by size or by distance from the Sun and finally grasp the real scale - Read the numbers that matter: diameter, mass, gravity, day, year, temperature, moons, composition - Test yourself with a 10-question Solar System quiz that tracks your best score - Save your favorite worlds and pull them up instantly from the Explore tab PERFECT FOR - Curious minds who want astronomy explained without a textbook - Parents and teachers looking for a clean, ad-free way to show kids the planets - Students revising planetary facts before a test - Stargazers who want the science behind what they see at night WHY NOT JUST SEARCH ONLINE? A search gives you one number at a time, wrapped in ads, and never shows you motion or scale. SolarMap puts the whole system in one place — orbiting, comparable, sourced from NASA Solar System Exploration and ESA archives, and readable offline on a plane, a camping trip or a classroom with no Wi-Fi. PRIVACY No account, no sign-up, no ads, no tracking. Your favorites and quiz score stay on your device. The app makes no network requests for its content because all data and imagery ship inside it. FULL ACCESS The Sun, Mercury, Venus, Earth and Mars are free to explore. Full Access unlocks the gas and ice giants (Jupiter, Saturn, Uranus, Neptune), Pluto, Ceres, the Moon, Titan and Europa, plus faster orbit speeds, unlimited favorites, every Compare entry, all Learn articles and the Solar System quiz. Available as a weekly subscription, a yearly subscription, or a one-time lifetime purchase. Open the Orrery and tap a planet to start exploring. Terms of Use (EULA): https://web-levi.web.app/terms Privacy Policy: https://web-levi.web.app/privacy-policy Questions? tphuc.work@gmail.com
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Verdict
The clearest difference is price: Solar System at Free against Phys. Lab's $4.99. Phys. Lab's advantage is in-app purchases (none vs 3) and update cadence (fortnightly vs every 6 weeks). On 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
Solar System is free to download; Phys. Lab costs $4.99 up front. Solar System sells 3 in-app purchases, starting at $2.99 per 7 days. Phys. Lab asks for nothing beyond the download.
Phys. Lab ships an update fortnightly, Solar System every 6 weeks. Both last shipped on November 5, 2026.
| Parameter | Phys. Lab | Solar System |
|---|---|---|
| Price | $4.99 | Free — better |
| Update frequency | Fortnightly — better | Every 6 weeks |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 15.6 — better | 17.0 |
| Further details — not scored | ||
| Size | 24 MB | 25 MB |
| Age rating | 4+ | 4+ |
| Developer | 坤 冉 | Phuc Pham |
In-app purchases
Phys. Lab
No in-app purchases
Solar System
- Weekly$2.997 Days
- Yearly$14.991 Year
- Lifetime Pro$29.99









