Comparison

SPHERE vs Space Outpost

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

Head to head
About

SPHERE

Features
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- Worldview - The Sphere (Earth) is now facing the threat of annihilation by invaders. Humanity has been forced from their homes and has begun developing new weapons in underground facilities. As countless lives and resources are lost, humans have finally succeeded in developing a new weapon capable of opposing the invaders. Now, having endured years of agony, it is time to advance toward the hope of liberating the Sphere! Humanity is now launching a counteroffensive! - Game Overview - This is a simple placement-style tower defense game where you place units to defeat incoming enemies! As you defeat enemies, your resources increase, allowing you to place new units or upgrade existing ones! - Game Difficulty - Difficulty levels are EASY, NORMAL, and HARD! This game is suitable for tower defense beginners to advanced players, offering a challenging gameplay experience for everyone! There are 10 refined stages for each difficulty level, with each stage lasting about 5 to 15 minutes! Enjoyable even during a short break! Whether you are new to tower defense or a master, this game is for you! - Unit Types - Players can use the following seven types of units: [Attack Units] Each unit excels in different situations, so place them appropriately according to the battlefield conditions! Standard Attack Turret: A unit with a short attack interval, specializing in defeating enemies one by one. Area Attack Turret: A unit that excels in attacking multiple enemies with explosive blasts. Piercing Attack Turret: A unit that excels in attacking enemies lined up in a straight line. [Support Units] These units enhance the advantages of friendly units, so place them without hesitation when you have extra resources! Cooling Turret: A unit that slows down the speed of enemies. Incendiary Turret: A unit that increases the attack power of attack units. [Support Attack Units] Use these units to weaken enemies before friendly units attack or as an emergency response to prevent enemy breakthroughs! Fixed-Point Attack Unit: Provides pinpoint missile support attacks at specific locations. Linear Attack Unit: Conducts satellite laser bombardment at designated linear locations.

About

Space Outpost

Defend your outpost against relentless alien hordes in this sci-fi tower defense game. Strategically build and upgrade defensive towers, deploy mobile units, and utilize powerful orbital strikes to save the sun. Play offline and one-handed.

Highlights
  • Campaign across unique planets
  • Diverse tower and unit types
  • Mobile strike units and orbital powerups
  • Multiple enemy types and bosses
  • Classic and Sudden Death game modes
  • Offline and one-handed play
  • Unlockable towers, units, and powerups
Features
Read full description

Space Outpost is a hand-crafted sci-fi tower defense game, built for one-handed portrait play and fully playable offline. The sun is dying. Kyro is the only fuel that can keep it burning, and it is mined on the most hostile worlds in the system. You command the outpost that holds them. Hold the line, Commander. A growing roster of planets, an escalating bestiary, mobile strike units, and orbital powerups mean no two stands play the same. HOLD THE LINE • Battle across a campaign of unique planets, from the pale dust of Lunar Field to the black cliffs of the Obsidian Throne, with more worlds on the way. • Each world has its own terrain, lanes, and threats, ramping from Easy to Nightmare. • Clear milestone waves at 25, 50, 75, and 100 for escalating Kyro payloads, then hold out as long as you can in endless waves past 100. BUILD YOUR DEFENSE • Stack guns and support buildings: Laser, Plasma, Burst, Beam, and Nova towers, plus Barracks, Repair Bay, Refinery, Trading Post, Targeting Uplink, and Shield Pylon. • Upgrade every tower through multiple tiers. • Mine rock, raise walls, and lay mines to shape the kill zone. GO ON THE OFFENSIVE • Deploy mobile units that march out and fight: Troopers, Snipers, Rocket Troopers, and Medic Drones. • Call in single-use powerups: Meteor strikes, Orbital Strikes flown by your own ship, Fission Bombs, Supply drops, field Repair, Freeze, Overclock, Trooper Drops, and Energy Boosters that triple one turret's damage for thirty waves. KNOW YOUR ENEMY • Face Grunts, Runners, Brutes, swarming Mites, shielded Bulwarks, tower-diving Reavers, splitters, flyers, freeze-proof Wraiths, and self-healing Hive Crawlers. • Survive boss waves: Warlords, Warbringers, Titans, Colossus brood-carriers, and the flying Dreadnought capital ship. • Study every threat in the in-game Armory before it lands on your doorstep. TWO WAYS TO PLAY • Classic: repair your base between waves and dig in for the long haul. • Sudden Death: low base HP, no repairs. One leak ends the run. Higher Kyro payouts for the brave. SPEND KYRO, UNLOCK EVERYTHING • Earn Kyro by clearing milestone waves, then permanently unlock new towers, units, and powerups in the Armory. • Plays fully offline: no account, no internet required. • Designed for portrait, one-handed play. Hold the line. Every gram of Kyro buys the sun another day.

Screenshots

SPHERE4 screens
Space Outpost4 screens

Verdict

The call

The clearest difference is update cadence: Space Outpost at daily against SPHERE's every 4 months. SPHERE's advantage is device support (3 vs 1) and iOS requirement (13.0 vs 16.4). On price, ads and in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

SPHERE ships an update every 4 months, Space Outpost daily. The most recent releases landed on October 10, 2026 and October 24, 2026 respectively.

Scorecard3 real differences · 7 level
SPHERE versus Space Outpost: the parameters behind the verdict, then further details
ParameterSPHERESpace Outpost
PriceFreeFree
Rating—5.0 (2 ratings) — better
Positive reviews—100.0% of reviews
Number of ratings—2 — better
Update frequencyEvery 4 monthsDaily — better
AdsYesYes
In-app purchasesNoNo
Monetization—Ad-supported
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS13.0 — better16.4
Further details — not scored
Size154 MB78 MB
Age rating4+12+
DeveloperTomoki FukushimaSteven Brown

In-app purchases

None

SPHERE

No in-app purchases

None

Space Outpost

No in-app purchases

Questions

Is SPHERE free?
SPHERE is free to download, with no in-app purchases.
Is Space Outpost free?
Space Outpost is free to download, with no in-app purchases.
Do SPHERE or Space Outpost have ads?
Both SPHERE and Space Outpost show ads.
Which is updated more often, SPHERE or Space Outpost?
SPHERE ships an update every 4 months, and Space Outpost daily. Most recently, SPHERE was updated on October 10, 2026 and Space Outpost on October 24, 2026.

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