PC requirements

Under the Island System Requirements

Under the Island needs at least Intel Core i5-3210M (2 * 2500) or equivalent, 4 GB RAM and Intel HD 4000 graphics. For the recommended experience you want Intel Pentium G3250 (2 * 3200) or AMD Phenom 9850 Quad-Core (4 * 2500) or equivalent, 8 GB RAM and GeForce GTX 460 (1024 MB) or Radeon HD 6850 (1024 MB) graphics.

Verified Sources: Steam store listing
Under the Island minimum and recommended PC specifications
Component Minimum Recommended
Operating system Windows 7/8/8.1/10 x86/x64 Windows 7/8/8.1/10 x64
Processor Intel Core i5-3210M (2 * 2500) or equivalent Intel Pentium G3250 (2 * 3200) or AMD Phenom 9850 Quad-Core (4 * 2500) or equivalent
Memory 4 GB RAM 8 GB RAM
Graphics Intel HD 4000 GeForce GTX 460 (1024 MB) or Radeon HD 6850 (1024 MB)
DirectX Version 9.0c Version 9.0c
Storage 1 GB available space 1 GB available space
Not sure how your PC compares? Use the Can I Run It checker — pick your CPU and GPU and it tells you which column you land in.
Playing on a handheld instead? Players report Under the Island as Platinum on Steam Deck and Linux.

Other platforms

Under the Island is also available on these systems, where hardware is fixed and no per-PC check is needed:

Quick answers

Running Under the Island on PC

Can my PC run Under the Island?
Compare your CPU, GPU and RAM against the minimum column below. If your parts match or beat every minimum row, the game will launch — though you may need to lower settings. Matching the recommended column is what gets you 60fps at 1080p.
How much storage does Under the Island need?
1 GB available space
What is the difference between minimum and recommended specs?
Minimum means the game starts and is playable, usually at 30fps on low settings at 1080p. Recommended is the developer's target for a smooth 60fps experience at high settings.