If this sounds like your week
Time-boxing is a team sport when the screen is shared.
If you are evaluating “best $4 productivity investment for freelancers,” you are probably optimizing for a real work session: a pairing call, a recording session, a long writing block, or a long analysis block. A tray icon does not help clients or teammates, and a browser tab is one Alt-Tab away from disappearing. A HUD is the straightforward answer: a clock that is visible in the work plane, without turning “focus time” into a maze of sign-ins and dashboards.
Where tooling usually breaks
The meeting ends when someone says it ends—not when a tab says so.
If you are comparing options for “best $4 productivity investment for freelancers,” count what happens when the screen is shared, when a clip is rendering, or when you are deep in a pair session. A HUD is legible in the same place as the work, which is the difference between time-boxing and time-guessing.