Since there is no "official" Alpha 3 app for mobile, GameJolt has become the primary hub for fan-developed versions. When searching for you will typically find:
The search for on mobile via GameJolt often leads players into a world of fan-made remakes, unofficial ports, and historical builds . While the official "Alpha 3" was a PC-only milestone released back in December 2016, the community on GameJolt has kept this specific era alive through various mobile-compatible projects. What is Hello Neighbor Alpha 3?
Projects like Hello Neighbor: Alpha 3 Extended by Oxy_eager offer demo versions that attempt to recreate or expand upon the original Alpha 3 experience.
You may find base projects, such as those by Harveyyoyo , which provide a template for mobile Hello Neighbor games, sometimes including Alpha 3 assets. Installation Guide for Mobile (GameJolt)
Some creators, like RealStudioGame , have uploaded APK files specifically titled "Hello Neighbor Alpha 3 Android".