Zylon Defenders vs Space Outpost
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
Zylon Defenders
Experience a modern take on a classic space combat simulator. Engage in thrilling first-person space battles inspired by a legendary 1979 title. Explore the cosmos and defend against alien threats in this immersive simulation.
- First-person space combat
- Real-time simulation
- Modern reinterpretation of classic
- Space exploration
- Alien defense
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A modern reinterpretation of Doug Neubauer's legendary 1979 real-time first person space simulator, Star Raiders.
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.
- 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
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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
Verdict
The clearest difference is ads: Zylon Defenders at none against Space Outpost's shown. Zylon Defenders also leads on monetization model (free vs ad-supported). Space Outpost's advantage is update cadence (daily vs every 2 months) and rating (5.0 vs 4.8). On price, review sentiment, ratings volume 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Space Outpost holds the better App Store score, 5.0 against 4.8. Both are backed by a comparable volume of ratings — 4 and 2 respectively. Written reviews split almost evenly too, at 100% and 100% positive.
Zylon Defenders ships an update every 2 months, Space Outpost daily. The most recent releases landed on November 2, 2026 and October 31, 2026 respectively.
| Parameter | Zylon Defenders | Space Outpost |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (4 ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | 4 — better | 2 |
| Update frequency | Every 2 months | Daily — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free — better | Ad-supported |
| Devices | iPhone, iPad — better | iPhone |
| Requires iOS | 18.6 | 16.4 — better |
| Further details — not scored | ||
| Size | 266 MB | 78 MB |
| Age rating | 4+ | 12+ |
| Developer | Jeff Glasse | Steven Brown |
Customer experience
Zylon Defenders
Space Outpost
In-app purchases
Zylon Defenders
No in-app purchases
Space Outpost
No in-app purchases
Questions
Is Zylon Defenders free?
Is Space Outpost free?
Which has better reviews, Zylon Defenders or Space Outpost?
Do Zylon Defenders or Space Outpost have ads?
Which is updated more often, Zylon Defenders or Space Outpost?
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