Planet Gravity vs Silly Sound Maker
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Select different planets for unique gravity
- Observe pendulum collisions
- Physics-based simulation
- Educational planet facts
- Interactive entertainment
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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.....)
Silly Sound Maker
Easily record your voice or any sound and then manipulate its speed and pitch by simply dragging a circle on the screen. This application offers a fun and intuitive way for users of all ages to create unique audio effects.
- Record sounds
- Change speed
- Alter pitch
- Intuitive drag interface
- Fun for all ages
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- Touch, talk, drag. Silly Sound Maker is simple and fun to use for all ages. - Record a sound, then change the speed and pitch by dragging a circle on the screen.
Screenshots
Verdict
The clearest difference is review sentiment: Silly Sound Maker at 75% against Planet Gravity's 25%. Silly Sound Maker also leads on iOS requirement (14.0 vs 17.6). Planet Gravity's advantage is price (Free vs $0.99). On update cadence, ads, in-app purchases and device support 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
Planet Gravity is free to download; Silly Sound Maker costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Planet Gravity ships an update every 14 months, Silly Sound Maker every 26 months. The most recent releases landed on June 7, 2026 and August 3, 2026 respectively.
| Parameter | Planet Gravity | Silly Sound Maker |
|---|---|---|
| Price | Free — better | $0.99 |
| Rating | — | 4.4 (7 ratings) — better |
| Positive reviews | 25.0% of reviews | 75.0% of reviews — better |
| Number of ratings | — | 7 — better |
| Update frequency | Every 14 months — better | Every 26 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.6 | 14.0 — better |
| Further details — not scored | ||
| Size | 5 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Niagara Mobile LLC | Michael Gruenthal |
Customer experience
Planet Gravity
Silly Sound Maker
In-app purchases
Planet Gravity
No in-app purchases
Silly Sound Maker
No in-app purchases
Questions
Is Planet Gravity free?
Is Silly Sound Maker free?
Do Planet Gravity or Silly Sound Maker have ads?
Which is updated more often, Planet Gravity or Silly Sound Maker?
Other comparisons
