Idle 51 App icon

Idle 51

Developed by PlaySide

Price: Free
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  • App Category
  • Version
  • App Size
    462 Mb
  • Released
    February 2021

Alien Idle Game‪!‬

The aliens have CRASH landed!Salvage as much alien tech as possible from the downed UFO and take it to your super secret desert facility for research in Idle Area 51.

Start small and build your operation from scratch. Unlock the secrets of alien biology, UFO construction, high-powered laser weaponry and interstellar travel and gain more funding from the shadowy government department overseeing everything. Maximize the efficiency of your facility by speeding up your processes; buy more vans, get more salvage, increase your research stations, train your workers and grow your operations!

But you’ll need to work fast. Keep an eye out for the little green guys, get your tinfoil hats ready and expect a visit from the Guys in Black! Start a misinformation campaign to throw the public off the scent, watch out for raids on your facilities and upgrade your operations with goodies from interplanetary Star Gates and mysterious Quasars.

You’re in charge of the facility so develop your strategy, reduce costs, increase revenue and know that the choices you make will decide the fate of your operation ...and maybe even the world!

Need help? Use our Idle 51 Walkthrough page or sign up and make your contribution today.

Idle 51 is a free-to-play, strategy and simulation game developed by PlaySide and released in February 2021. You can download the app on iOS 10.0 and later on the following devices: iPhone 13 Pro Max, 12 Pro, X, SE, iPhone 8, 7, iPad Pro, and iPad Mini.

What's new in version 1.8.7

The Aliens have a brand new update for you: - Bringing more bug fixes and stability to you.

Download Idle 51 App for iOS/Android Now

You can quickly download Idle 51 iPhone/iPad and Android app by clicking the download buttons or scanning the QR code below.

App Rating & Ranking

Rankings History
  • Ranked #195 in US App Store / Strategy
  • Idle 51 has an average rating of 4.8.

App Updates

  • Release v1.8.7 Mar 10, 2022
  • Release v1.8.1 Sep 7, 2021
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Idle 51 Add-Ons

The app is free, but you can buy extra add-ons via in-app purchases.



Government Coverup


Large Gem Pack




Massive Gem Pack


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Small Gem Pack


Tin Foil Hat


Tiny Gem Pack