Comparison

UnderAttack vs Stellar Outpost

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

Head to head
About

UnderAttack

Features
Read full description

Defend Earth from alien invasion! Command powerful starships, upgrade devastating weapons, and face epic boss battles across 10 chapters. Easy to learn, impossible to master. Join the fight and become the hero Earth needs! INTENSE SPACE COMBAT • Fast-paced tower defense shooter with smooth touch controls • Dynamic enemy spawn patterns keep you on your toes • Strategic buff system for tactical decisions during missions • Adaptive difficulty that adjusts to your skill level DEEP UPGRADE SYSTEM • Unlock 7 legendary captains with unique combat abilities • 5 weapon types: Cannon, Laser, Missile, Freeze Ray, Chain Lightning • Strategic temporary buffs: shields, damage boost, critical hits • Collect and upgrade 6 different starship classes • Each ship has unique stats and weapon slots EPIC BOSS BATTLES • 50 boss battles across 10 unique planets • Each boss has distinct attack patterns and strategies • Massive capital ships and alien motherships • Challenging boss stages with fewer but stronger enemies PROGRESSION & COLLECTION • 250 stages across 10 planets (25 levels per planet) • 7 legendary captains with unique abilities: - Nova: Damage specialist - Vex: Critical hit master - Iron: Defensive tank - Blaze: Speed demon - Phantom: Stealth striker - Zeus: Lightning lord - Omega: Ultimate commander • Strategic buff system with 15+ temporary upgrades • Data currency for tactical decisions during missions • Adaptive difficulty adjusts based on your performance WHAT PLAYERS SAY "Best mobile space shooter I've played this year!" - 5 stars "Perfect balance of challenge and casual fun" - 5 stars "Finally a shooter that doesn't force ads!" - 5 stars 100% FREE TO PLAY • Download and play completely free forever • Optional in-app purchases for faster progression • No forced ads - watch for bonus rewards only • Full offline play support - no internet required • Fair difficulty with adaptive assistance for struggling players PREMIUM FEATURES • Stunning particle effects and explosions • Original sci-fi soundtrack and sound design • Regular content updates with new chapters and captains • Cloud save - seamlessly play across devices • Optimized for all iOS devices and tablets • Portrait and landscape mode support • One-handed gameplay option PERFECT FOR • Fans of classic arcade space shooters and tower defense games • Players who love boss battles and strategy • Anyone seeking quick 5-10 minute gaming sessions • Collectors who enjoy unlocking characters and ships • Casual and hardcore gamers alike REGULAR UPDATES • New chapters released quarterly • Weekly balance updates based on player feedback • Monthly events with exclusive rewards • Active development team listening to community Join the battle today! Download Under Attack: Idle TD and become the hero Earth needs. Command your fleet, upgrade your arsenal, and prove you're the galaxy's greatest defender!

About

Stellar Outpost

Build a space mining empire by tapping to mine stardust and automating production with drones and space stations. Earn rewards offline and prestige for permanent boosts as your empire scales.

Highlights
  • Tap to mine stardust
  • Automate production with drones
  • Upgrade to space stations
  • Offline earnings
  • Prestige system for boosts
  • Bonus comet rewards
Features
Read full description

Build your own space mining empire — one tap at a time. Mine glittering stardust from a drifting asteroid, then put your growing fleet to work. Recruit Mining Drones to keep the stardust flowing while you're away, upgrade to Cargo Haulers and full Space Stations as your empire scales, and watch the numbers climb. • Tap to mine, upgrade to automate • Three tiers of production, from scrappy drones to full space stations • Prestige for permanent Void Crystals and a lasting production boost • Real offline earnings — see what your fleet mined while you were away • Bonus comets drift by with rewards worth grabbing Stellar Outpost is built for a few minutes at a time — check in, collect, upgrade, and watch your outpost grow.

Screenshots

UnderAttack4 screens
Stellar Outpost4 screens

Verdict

The call

The clearest difference is in-app purchases: Stellar Outpost at none against UnderAttack's 9. Stellar Outpost also leads on update cadence (every 4 days vs every 4 months). On price, ads, device support 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. UnderAttack sells 9 one-off in-app purchases. Stellar Outpost asks for nothing beyond the download.

UpkeepUpdate frequency

UnderAttack ships an update every 4 months, Stellar Outpost every 4 days. The most recent releases landed on October 6, 2026 and October 11, 2026 respectively.

Scorecard2 real differences · 7 level
UnderAttack versus Stellar Outpost: the parameters behind the verdict, then further details
ParameterUnderAttackStellar Outpost
PriceFreeFree
Rating—5.0 (5 ratings) — better
Number of ratings—5 — better
Update frequencyEvery 4 monthsEvery 4 days — better
AdsYesYes
In-app purchasesYesNo — better
Monetization—Ad-supported
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS16.415.0 — better
Further details — not scored
Size88 MB13 MB
Age rating4+4+
DeveloperOGULCAN SACLIHOTTEST DROPS LLC

In-app purchases

9 purchases

UnderAttack

One-time9
  • 50 Gem$0.99
  • 130 Gem$1.99
  • Starter Pack$2.99
Show 6 more
  • Adventurer Bundle$4.99
  • 350 Gem$4.99
  • 650 Gem$7.99
  • Veteran Pack$9.99
  • Dreadnought$9.99
  • 1500 Gem$14.99
None

Stellar Outpost

No in-app purchases

Questions

Is UnderAttack free?
UnderAttack is free to download, with in-app purchases available.
Is Stellar Outpost free?
Stellar Outpost is free to download, with no in-app purchases.
Do UnderAttack or Stellar Outpost have ads?
Both UnderAttack and Stellar Outpost show ads.
Which is updated more often, UnderAttack or Stellar Outpost?
UnderAttack ships an update every 4 months, and Stellar Outpost every 4 days. Most recently, UnderAttack was updated on October 6, 2026 and Stellar Outpost on October 11, 2026.

Other comparisons