Comparison

Planet Gravity vs Galaxy Gallery

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

Head to head
About

Planet Gravity

Explore the gravitational pull of different celestial bodies. Watch pendulums swing and collide under varying gravitational forces, offering a unique physics simulation experience.

Highlights
  • Select different planets for unique gravity
  • Observe pendulum collisions
  • Physics-based simulation
  • Educational planet facts
  • Interactive entertainment
Features
Read full description

Planet Gravity isn't just about gravity anymore. Select a planet to get a scrolling fact about that planet on the display. This app is a twist on the Newton’s cradle balance balls. The pendulum balls collide just like the real set and you can select other planets to use that planet’s gravity. How does the pendulum swing with different gravity? Even the Sun has gravity - see what it does to the motion of the pendulums (well they'd probably melt but you get the idea.....)

About

Galaxy Gallery

Explore planets in real-time 3D with augmented reality. Interact with celestial bodies, trigger environmental effects, and learn fascinating facts through optional voice narration. Build a personalized gallery of your favorite planets.

Highlights
  • Real-time 3D planet exploration
  • Augmented Reality (AR) placement
  • Interactive environmental effects
  • Optional voice narration for facts
  • Kid-friendly controls with haptics
  • Personalized planet gallery
Features
Read full description

Explore the Solar System in real-time 3D. Make focus an adventure. Galaxy Gallery brings planets, moons, and space facts to life—and now turns focused time into a journey of discovery. Choose a world, set a 15-, 25-, or 50-minute mission, and reveal more of the universe as you focus. GALAXY FOCUS ◆ Use a familiar Pomodoro rhythm with 15, 25, and 50-minute missions ◆ Set an intention and organize missions with your own categories ◆ Unlock Wonders: fascinating facts about planets, moons, and the universe ◆ Follow themed Journeys and watch your discoveries grow ◆ Review your focus time, streaks, categories, planets, and completed missions ◆ Use Deep Focus to block chosen distractions or keep essential apps available during a mission EXPLORE SPACE ◆ Explore every planet in beautiful, real-time 3D ◆ Watch the Earth–Moon system and Solar System move through their orbits ◆ Compare worlds at their true relative sizes ◆ Place planets in your space with AR Quick Look ◆ Rotate, zoom, and explore day and night on Earth ◆ Trigger effects including volcanoes, thunder, rain, snow, mist, and fire ◆ Hear optional narrated facts Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://www.jamesthang.com/policy/galaxy-gallery

Screenshots

Planet Gravity3 screens
Galaxy Gallery4 screens

Verdict

The call

The clearest difference is in-app purchases: Planet Gravity at none against Galaxy Gallery's 5. Planet Gravity also leads on ads (none vs shown). Galaxy Gallery's advantage is update cadence (monthly vs every 14 months). On price, 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

Both are free to download. Galaxy Gallery sells 5 one-off in-app purchases. Planet Gravity asks for nothing beyond the download.

UpkeepUpdate frequency

Planet Gravity ships an update every 14 months, Galaxy Gallery monthly. The most recent releases landed on June 7, 2026 and August 25, 2026 respectively.

Scorecard4 real differences · 6 level
Planet Gravity versus Galaxy Gallery: the parameters behind the verdict, then further details
ParameterPlanet GravityGalaxy Gallery
PriceFreeFree
Rating—4.5 (8 ratings) — better
Positive reviews25.0% of reviews—
Number of ratings—8 — better
Update frequencyEvery 14 monthsMonthly — better
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPadiPhone, iPad
Requires iOS17.617.0 — better
Further details — not scored
Size5 MB86 MB
Age rating4+4+
DeveloperNiagara Mobile LLCDinh Bao Thang Duong

Customer experience

Planet Gravity

Written reviews4 reviews
Positive25.0%
Neutral0.0%
Negative75.0%

Galaxy Gallery

All ratings8 ratings
Positive87.5%
Neutral0.0%
Negative12.5%

In-app purchases

None

Planet Gravity

No in-app purchases

5 purchases

Galaxy Gallery

One-time5
  • Kind Tip$0.99
  • Ad-Free Experience$0.99
  • Great Tip$1.99
Show 2 more
  • Amazing Tip$3.99
  • Outrageous Tip$6.99

Questions

Is Planet Gravity free?
Planet Gravity is free to download, with no in-app purchases.
Is Galaxy Gallery free?
Galaxy Gallery is free to download, with in-app purchases available.
Do Planet Gravity or Galaxy Gallery have ads?
Galaxy Gallery shows ads; Planet Gravity does not.
Which is updated more often, Planet Gravity or Galaxy Gallery?
Planet Gravity ships an update every 14 months, and Galaxy Gallery monthly. Most recently, Planet Gravity was updated on June 7, 2026 and Galaxy Gallery on August 25, 2026.

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