MDS vs Space Outpost
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
MDS
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Something strange is happening. Cities are being taken over by waves of identical vehicles. But who or what is driving these vehicles? And in such precise formation? Several cities have already fallen. They are now creating vehicles too and in more varieties. These waves need to be stopped. This is a tough tower defense game. Can you make the right strategic choices? • Wide variety of enemies, weapon types and maps • Each gun has its own targeting mode: Nearest, Fastest, Slowest, Closest to the End etc. • Buy the map chapters, once and play them for life • Choose your commander to boost your defenses and unlock greater power as you progress. Strategy: You have many decisions to make, choose well and you will win. For example: • Where should you deploy your guns? • Which types of guns should you use? • What targeting mode should you choose? • Which booster bonus should you choose? More gems per kill, instant gems, cheaper upgrades? Aim of the game: Destroy the enemy vehicles before they reach the end of the map. Keep at it until all the waves of enemies are finished. If you can reach the end with lives to spare then you have completed the map/level. Level and map are used interchangeably, they mean the same thing. Simply surviving is not enough for a good score. How to play: Choose which weapon type to place and of course where to place it. Then simply drag and drop it into position. Tap on any placed weapon to upgrade, change its targeting mode or to sell it. Commanders: Commanders provide passive abilities and a special strike ability. Passive abilities are always active. They provide permanent bonuses, such as increased weapon damage, rate of fire, range, and other stats. The Special Strike ability is a powerful, targeted action that you activate manually. After use, it enters a cooldown before it can be used again. • The base cooldown is 10 minutes • Cooldown time can be reduced through upgrades To use a Special Strike: 1. When ready, the commander’s image is replaced by a target icon 2. Click the target icon 3. Drag it to the area you want to strike 4. Release to activate the ability You need 'Points' to upgrade your commander’s abilities. All commanders start with 10 Points when you first launch the game. You can earn more 'Points' by completing levels and receiving 'Star' ratings based on your performance Each 'Star' you earn gives you 1 Point. There are currently 9 commanders available (3 for each chapter) Each commander has different passive abilities and Special Strike options, allowing for different play-styles. General: Each map will provide different challenges as the set path enemies follow will change. Vehicles do not block each other. This makes for a more challenging game. Maps/levels are grouped into chapters. Buy the map chapters once and play the purchased maps for life. No other purchases are required to play and beat the game. Some guns are restricted to higher map/level but as soon as you successfully complete the required map/level, the gun will be available for subsequent levels. No purchase is required to unlock any gun. Chapter 3 has gun upgrades that are not available in chapter 1 and 2. There are 3 separate map chapters available for purchase. GambitAx Gems GambitAx Gems can be used to purchase or upgrade weapons. When spending gems, the game will use normal gems first, and then GambitAx Gems to cover any remaining cost. Buying GambitAx Gems isn’t required. You can beat the game without purchasing any. Awards: Gain awards by reaching the relevant threshold in a category. There are several award categories. New awards are given at the end of the level. Disclaimer: All in-game items and GambitAx Gems (premium currency) are purely virtual and hold no real-world value. They cannot be exchanged, transferred, or redeemed for cash or other real-world goods. Refunds are handled according to Apple’s policies.
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 in-app purchases: Space Outpost at none against MDS's 7. Space Outpost also leads on update cadence (daily vs monthly) and iOS requirement (16.4 vs 26.0). MDS's advantage is ads (none vs shown). On price 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
Both are free to download. MDS sells 7 one-off in-app purchases. Space Outpost asks for nothing beyond the download.
MDS ships an update monthly, Space Outpost daily. The most recent releases landed on October 9, 2026 and October 10, 2026 respectively.
| Parameter | MDS | Space Outpost |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 1 — better |
| Update frequency | Monthly | Daily — better |
| Ads | No — better | Yes |
| In-app purchases | Yes | No — better |
| Monetization | — | Ad-supported |
| Devices | iPhone | iPhone |
| Requires iOS | 26.0 | 16.4 — better |
| Further details — not scored | ||
| Size | 171 MB | 78 MB |
| Age rating | 12+ | 12+ |
| Developer | Bruce Mattison | Steven Brown |
In-app purchases
MDS
- 100 GambitAx Gems$0.99
- Hard and Insane Difficulties$0.99
- Chapter 3 Maps$1.99
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- 300 GambitAx Gems$1.99
- Chapter 1 Maps$2.99
- Chapter 2 Maps$2.99
- Play Maps in Any Order$3.99
Space Outpost
No in-app purchases









