If this is useful, a ❤️ helps others find it. All tests run on an 8-year-old MacBook Air. HiyokoBar is a menubar app. Click the icon — panel appears. Do the thing. Click away — panel disappears. It sounds trivial. It took longer than expected to get right. Here's what I learned. The constraint that shaped everything A menubar panel has maybe 400px of vertical space. That's it. This constraint forced decisions I wouldn't have made otherwise: Every feature had to earn its place. No "maybe someone will want this" features. Each action had to complete in one click or one step. Two-step actions don't belong in a menubar panel. Visual hierarchy matters more than in a full window — users scan, not read. Constraints produce clarity. The limited space was the best design tool I had. The technical decisions Activation policy: accessory — no Dock icon, no Cmd+Tab entry. Panel positioning: calculate from tray icon position on every click — the user might have moved it.…