198+ iOS apps & games curated and reviewed
With an average user rating of 4.6★, the alien idle category is one of the App Store's strongest. Browse all 198+ apps and games we track, sorted so the most loved ones surface first.
Command an alien and grow its army by defeating humans in this idle RPG. Evolve your alien with new abilities, upgrade its stats, and face challenging boss battles to achieve extraterrestrial dominance.
Build and manage a secret desert facility to research salvaged alien technology. Expand your operations, unlock advanced research, and defend against government raids and alien interference. Your strategic decisions will determine the fate of your facility and potentially the world.
Engage in an endless sci-fi idle game battling alien waves. Customize your ship with unlockable weapons and defenses, and strategically upgrade various systems to increase your power. Make impactful decisions to counter enemy types and progress through a well-paced unfolding experience.
Simulate incredible transformations from human to mythical creatures like Werewolves, Yetis, and Aliens. Explore various evolutionary paths and discover unexpected outcomes in this engaging simulation game.
Embark on a terrifying quest for survival aboard a space station. Unprepared and underequipped, you must use your wits and courage to escape an unknown menace. Experience a faithful mobile replication of the classic survival horror game, complete with AAA visuals and an arresting narrative.
Engage in a hyper-casual space war by tapping to destroy hostile spaceships. Upgrade your alien heroes to increase damage and unlock new abilities. Enjoy a stress-relieving, offline gaming experience.
Embark on a dark fantasy adventure as a Shadow Hunter, battling demons and monsters in a ruined world. Master intense hack and slash combat, face epic boss fights, and upgrade your gear to restore light.
Build a research station to uncover the secrets of a mysterious alien Obelisk. Manage employees, defend your base from alien invaders, and upgrade heroes. Progress continues even when you're offline.
This idle game challenges players to multiply numbers and reach infinite heights by filling circles. Unlock new mechanics, boost multipliers, and automate actions for optimized progress. Compete with others on the leaderboard and earn achievements.
Build and expand your own planet from the ground up in this addictive idle clicker game. Upgrade your world to generate energy, colonize new areas, and introduce life. Can you unlock the atmosphere and create a thriving planet?
This puzzle game challenges you to solve intricate problems without touching the screen. It utilizes minimalistic visual cues, sonic interfaces, and haptic feedback to guide you through unique challenges that require thinking outside the box. Discover a new way to interact with your device and prove your cleverness.
Build and manage your own space mining empire in this idle simulation game. Upgrade planets, smelt ore, hire managers, and play the galactic market to maximize profits. Compete in weekly tournaments for premium rewards.
Defend your home planet from an alien invasion in this unique tower defense strategy game. Instead of building towers, you'll destroy enemy structures using a variety of military units and upgrades. Engage in seamless battles with growing difficulty and diverse enemies.
Build and decorate unique planets in space with beautiful objects. This relaxing idle game allows for strategic competition on real-time leaderboards. Collect coins, use upgrades and boosters, and continue progressing even when offline.
This word puzzle game challenges players to find hidden words by connecting letters on a grid. With over 2000 levels, it offers a fun way to boost vocabulary, concentration, and thinking speed for adults. Play offline and in multiple languages.
Engage in a thrilling 3D invasion game where you must identify and eliminate hidden aliens disguised as ordinary people. Utilize scanners and blasters to complete levels, unlock new weapons, and rescue citizens from alien isolation across various city suburbs.
Build and customize historical aircraft piece by piece, then take them to the skies in challenging aerial survival missions. Earn in-game currency to expand your fleet and become an ultimate air force legend.
Lead an alien entity in an idle survival game to conquer the planet by consuming humans and evolving your army. Face formidable bosses and complete quests in exhilarating arcade action.
Build an empire of cannons to defend worlds against alien invaders in this casual idle shooting game. Discover new technologies and blast your way to victory.
Defeat waves of aliens to gain resources and power up your neon towers. This offline sci-fi tower defense game features incremental upgrades and automatic combat, even when you're not playing. Master alien invasion strategies to push deeper into the galaxy.