Best standing desk timer for solo founders

There are roughly 15-25 dedicated standing desk timer apps on the market, but almost all of them are either over-engineered wellness platforms (aimed at enterprises) or bare-bones Pomodoro knockoffs that don't understand solo founder rhythms. The core pain point isn't timing itself—it's that most tools don't integrate with the founder's actual workday: they ignore deep work sessions, don't sync with calendar blocking, and create friction rather than flow. The real gap exists at the intersection of (1) stupid-simple UI for someone who doesn't want another dashboard, (2) smart defaults tuned for solo work patterns (60-90 min focus blocks, not arbitrary 30-min rotations), and (3) zero friction integrations with Slack or calendar apps so the timer lives in your existing tools, not as Yet Another App. A new entrant should focus obsessively on the solo founder's actual standing desk behavior—when they actually switch positions, what kills their productivity, how they batch movement with breaks—rather than copying corporate wellness playbooks. The winner here will be radically simple, mobile-first (since founders walk around), and built as a Slack bot or calendar plugin, not a standalone app.