After you use a Reaction, the 2024 D&D basic rule prevents another until the start of your next turn. A new round alone does not restore it. In your sheet, record the relevant point: your next turn’s start, not just a round number.
We will use two original tabletop examples with the order A → B → C. You control B, and no special feature grants additional Reactions or changes the rule. The source is the Reactions section of the 2024 Basic Rules.
An opportunity after your turn
In round one, A acts, then you take B’s turn. During C’s turn a valid trigger occurs and you choose to spend B’s Reaction. Record: “Reaction used during C; available again at the start of my next turn.”
Round two starts and A acts. If another opportunity appears before B’s turn begins, the basic rule still prevents another Reaction. Moving from “round one” to “round two” has not crossed the boundary in your note.
At the start of B’s turn, that boundary arrives. The rule no longer prevents another Reaction; every possible use still needs its own trigger and requirements. Having one available does not make every event a valid reaction opportunity.
An opportunity before your turn
Reset the example. During a round in which B has not acted yet, A triggers a valid Reaction from B and you spend it. B’s turn then starts: that is already B’s next turn relative to the use.
If another valid opportunity arises during C’s later turn, B can react again under these assumptions. B would have reacted twice within one round, with the start of B’s turn between the uses. That does not ignore the limit; it demonstrates why “one per round” can misdescribe the recovery point.
Keep a note that does not depend on memory
A character note can hold three details: the trigger, when you spent the Reaction and which turn start you are waiting for. For example: “Used during C, round one. Wait until B starts in round two.” Review and update the note manually when that point arrives.
DnD Dynamic Sheet manages turn actions, notes and character resources. This suggestion uses a note. It does not claim the app validates triggers, prevents illegal Reactions or automatically resets this tracking. If your character has an exception, record the specific rule rather than inventing another general limit.
Before your next game
The official fact sheet describes a Windows desktop application focused on the player’s character sheet, with characters saved on the computer. It is neither a shared virtual tabletop nor a campaign manager. The Windows beta is available through a purchase with a one-device license. Initial activation needs internet; the sheet and local data can then be used offline, while updates and online validation require a connection.
Review the product and recordings to decide whether it fits your table. You can already prepare the line that avoids the confusion: “Spent until the start of my next turn”, including the actual point in this encounter.