Gravox vs Zero?
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
Gravox
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Gravity force can be changed yourself! *** Features *** - Simple to play, just tap! - Feel gravity and change it! - Addicted speed-run! *** How to play it *** Nothing is difficult! If you tap the display, a direction of gravity will be changed clockwise. You have to make a player(white box) attack to the goal(red box). Also, you can change the force of gravity in Select Level view, so when you do it you will feel the difficulty is changed. Try getting a new record! This game has many achievements, and can be recorded your record time to Leaderboard on GameCenter. I hope you enjoy it!!
Zero?
A fast-paced number game where players must quickly determine if sums of numbers are multiples of ten. Offers various modes for solo play or head-to-head challenges with friends.
- Sum calculation challenges
- Timed gameplay
- Relaxed mode without time pressure
- Two-player head-to-head mode
- Multiplayer on a single device
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Can you tell if the sum of 3 numbers are a multiple of ten? 4 numbers? More? It sounds easy, but hurry... time is running out! Challenge your friends, and play face-to-face on a single iPad or iPhone! Fun for all ages, choose your favourite mode: • Zoom & Zen, for a fast or easy-paced challenge • Relax, for stress-free fun without the time pressure • Two-player, the unique way to play with your friends in head-to-head action! Reviews for Sum Fun: “ It’s a solid math game, one that brings in interesting gameplay ideas and which has a stellar execution ” – AppGames.net: 9 / 10 “ By the time your kids have played with this app a few times, they’ll be adding up the numbers faster than you can say, ‘What’s six plus eight?’ ” – Fun2Tap: 5 / 5
Screenshots
Verdict
The clearest difference is price: Zero? at Free against Gravox's $0.99. Zero? also leads on iOS requirement (8.0 vs 14.0). 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
Zero? is free to download; Gravox costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Gravox ships an update every 5 months, Zero? every 3 months. The most recent releases landed on May 16, 2026 and September 16, 2026 respectively.
| Parameter | Gravox | Zero? |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | — | 3.3 (4 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 4 — better |
| Update frequency | Every 5 months | Every 3 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 14.0 | 8.0 — better |
| Further details — not scored | ||
| Size | 4 MB | 27 MB |
| Age rating | 4+ | 4+ |
| Developer | yukihiro fujita | Greg Sharpe |
In-app purchases
Gravox
No in-app purchases
Zero?
No in-app purchases
