Three honest fit comparisons for the tools US schools actually use when a teacher calls in sick and somebody has to teach the day.
Most buildings already own something that touches an absence. The day off gets reported through a district system, the office chases a fill between 5:30 and 7:00 in the morning, and the plans themselves live in a binder on top of a filing cabinet or a folder on a shared drive. ChalkHandoff sits in the last of those three places: the reusable plan set, the current seating chart, and the handoff pack that reaches the substitute before first period.
These pages compare the shape of each option, not price sheets we cannot verify. We describe what a tool is built around and which kind of operator it suits, whether that is one fifth grade teacher paying $9 a month, a grade team splitting a $39 plan library, or an office running coverage for a whole building at $149. Where a district level absence system is the right call for your role, we say so plainly.