Detects if the client is running on macOS

IsMacOS.lua

-- Don't use this for anything critical; Roblox could change this functionality at any time.
-- Returns true if the client is running on macOS, otherwise false.
-- Note that it yields for a heartbeat.

local Players = game:GetService("Players")
local RunService = game:GetService("RunService")

local Player = Players.LocalPlayer
local PlayerGui = Player:WaitForChild("PlayerGui")

local COMMAND_IMAGE = "rbxasset://textures/ui/Controls/command.png"

return function()
	local part = Instance.new("Part")
	part.Anchored = true
	part.CanCollide = false
	part.CFrame = workspace.CurrentCamera.Focus
	part.Transparency = 1
	local proximityPrompt = Instance.new("ProximityPrompt")
	proximityPrompt.Exclusivity = Enum.ProximityPromptExclusivity.AlwaysShow
	proximityPrompt.KeyboardKeyCode = Enum.KeyCode.LeftControl
	proximityPrompt.MaxActivationDistance = 1e6
	proximityPrompt.RequiresLineOfSight = false
	proximityPrompt.UIOffset = Vector2.new(0, 1e6)
	proximityPrompt.Parent = part
	part.Parent = workspace.CurrentCamera

	RunService.Heartbeat:Wait()
	
	local result = false
	local proximityPrompts = PlayerGui:FindFirstChild("ProximityPrompts")
	if proximityPrompts then
		for _, prompt in ipairs(proximityPrompts:GetChildren()) do
			for _, child in ipairs(prompt:GetDescendants()) do
				if child:IsA("ImageLabel") and child.Image == COMMAND_IMAGE then
					result = true
					break
				end
			end
		end
	end

	part:Destroy()
	return result
end