Defend Earth! vs Knife Fall
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
Defend Earth!
Protect Earth from incoming asteroids by maneuvering an orbital mega-shield. Tap to control the shield's rotation and thrust, deflecting threats before they strike the planet. Rise through the ranks as you defend humanity.
- Orbital mega-shield defense
- Tap controls for rotation and thrust
- Asteroid deflection gameplay
- Rank progression system
- Limited planet impact tolerance
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Defend the Earth! Maneuver the orbital mega-shield around the planet and attempt to repel the unrelenting horde of incoming asteroids. You are humanity's only hope. You cannot fail. You must not fail. Game Play: It's all about the agile thumbs: tap on the right side of the screen to move the shield clockwise, tap on the left side to move counter-clockwise. Tap and hold for continuous shield thrust. Maneuver the shield around the earth to deflect incoming asteroids. Rack up points and climb the ranks from humble Cadet to awe inspiring Shieldlord. But be warned: though the earth is resilient and can withstand four asteroid impacts, allow a third strike and it's game over.
Knife Fall
Tap to throw knives at rotating targets and cut them for points. Keep the knife in the air and avoid letting it fall. Unlock different knives as you play.
- Tap to throw knives
- Cut rotating balls
- Avoid letting the knife fall
- Unlock different knives
- Score points
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The knife is rotating continuously, tap the screen to throw and cut the balls. Don't let the knife fall, throw it up and keep the knife always on air. You can choose between different knives. Get a lot of points by cutting balls. How many points can you get without falling the knife?
Screenshots
Verdict
The clearest difference is price: Defend Earth! at Free against Knife Fall's $0.99. Defend Earth! also leads on in-app purchases (none vs 1) and iOS requirement (9.0 vs 12.0). On rating, ratings volume, update cadence and 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
Defend Earth! is free to download; Knife Fall costs $0.99 up front. Knife Fall sells 1 one-off in-app purchase. Defend Earth! asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 5.0 for Defend Earth! against 5.0 for Knife Fall. Both are backed by a comparable volume of ratings — 1 and 1 respectively.
Both ship on a similar rhythm, roughly every 4 months. The most recent releases landed on October 21, 2026 and September 30, 2026 respectively.
| Parameter | Defend Earth! | Knife Fall |
|---|---|---|
| Price | Free — better | $0.99 |
| Rating | 5.0 (1 ratings) | 5.0 (1 ratings) |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | 1 | 1 |
| Update frequency | Every 4 months | Every 4 months |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Paid |
| Devices | iPhone, iPad, iPod, Apple Watch | iPhone, iPad, iPod, Apple Watch |
| Requires iOS | 9.0 — better | 12.0 |
| Further details — not scored | ||
| Size | 65 MB | 17 MB |
| Age rating | 9+ | 9+ |
| Developer | Matthew Barrie | Tocapp Games S.L. |
Customer experience
Defend Earth!
Knife Fall
In-app purchases
Defend Earth!
No in-app purchases
Knife Fall
- NoAdsAndUnlockAll$1.99
