Comparison

Space Outpost vs Grid Defense

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

Head to head
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.

About

Grid Defense

Features
Read full description

GRID DEFENSE is a fast, hand-tuned tower defense game about one simple job: hold the line. Six towers. Seven breeds of creep. One winding path. Place your defenses, upgrade under pressure, and stop everything the grid throws at you across 25 escalating waves — then push into endless mode. FREE TO START Download and play the first 10 waves free. Clear wave 10 to unlock the complete game with a single one-time purchase. No ads. No timers. No subscriptions. THE FULL GAME UNLOCKS • All 25 waves + endless mode • A second battlefield — The Quarry, where terrain fights back. Golems terraform the ground as they march, ore pockets pay out gold when cracked, and a keystone wall splits the map — hold it or watch the shortcut open • Tower-smashing GOLEMS — armored bruisers that stop to wreck your towers • WARDENS that raise energy shields — burst them before they recharge • A deployable DWARF hero — a roaming gunner only the wasps can touch, who levels up to repair wrecked towers and mine ore for gold • Bosses and the final victory stand • The global online leaderboard — submit your score and claim your rank SIX TOWERS, EVERY ONE USEFUL Gunner, Cannon, Frost, Venom, Tesla, Sniper — each with upgrades and a role. Freeze a swarm, chain-zap a cluster, poison the tanks, or snipe through armor. There's no single right build. AN ORIGINAL SCORE A title theme by IVEM BEATS plays you in, and every tower fires its own sound — know what's shooting without looking. BUILT FOR TOUCH Designed for the phone from the ground up — tap to build, tap to upgrade, pinch and pan the battlefield. The board fills your screen edge to edge. Landscape, smooth, and playable offline. No ads. No subscriptions. No login. Just you, the grid, and the line you have to hold.

Screenshots

Space Outpost4 screens
Grid Defense4 screens

Verdict

The call

The clearest difference is in-app purchases: Space Outpost at none against Grid Defense's 1. Space Outpost also leads on update cadence (daily vs every 2 weeks). Grid Defense's advantage is ads (none vs shown) and device support (3 vs 1). On price 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. Grid Defense sells 1 one-off in-app purchase. Space Outpost asks for nothing beyond the download.

UpkeepUpdate frequency

Space Outpost ships an update daily, Grid Defense every 2 weeks. The most recent releases landed on October 10, 2026 and October 12, 2026 respectively.

Scorecard4 real differences · 6 level
Space Outpost versus Grid Defense: the parameters behind the verdict, then further details
ParameterSpace OutpostGrid Defense
PriceFreeFree
Rating5.0 (1 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings1 — better—
Update frequencyDaily — betterEvery 2 weeks
AdsYesNo — better
In-app purchasesNo — betterYes
MonetizationAd-supported—
DevicesiPhoneiPhone, iPad, iPod — better
Requires iOS16.415.0 — better
Further details — not scored
Size78 MB10 MB
Age rating12+9+
DeveloperSteven BrownDimitar Porkov

In-app purchases

None

Space Outpost

No in-app purchases

1 purchases

Grid Defense

One-time1
  • Full Game Unlock$1.99

Questions

Is Space Outpost free?
Space Outpost is free to download, with no in-app purchases.
Is Grid Defense free?
Grid Defense is free to download, with in-app purchases available.
Do Space Outpost or Grid Defense have ads?
Space Outpost shows ads; Grid Defense does not.
Which is updated more often, Space Outpost or Grid Defense?
Space Outpost ships an update daily, and Grid Defense every 2 weeks. Most recently, Space Outpost was updated on October 10, 2026 and Grid Defense on October 12, 2026.

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