Short answer
Is Peeku a LookAway alternative?
Yes, if you want local presence context and a broader Mac desk-health
coach. No, if you only want the most polished dedicated eye-break app.
LookAway is stronger for smart eye-break flow. Peeku is narrower and
newer, but adds walk reminders, posture and distance nudges, menu-bar
presence status, no account, and local camera processing.
LookAway is better for Smart Pause, blink reminders, polished break timing, planned breaks, stats, and an eye-break-first workflow.
Peeku is better when you want the Mac to understand whether you are at the desk and you care about the presence/privacy model as much as the break timer.
Important caveat: Peeku's Mac App Store build is coaching-only. The full walk-away lock is the free Developer ID build because the App Store sandbox blocks the screen-lock command.
Compare Peeku with LookAway and other apps or try Peeku on the Mac App Store.