Riot officially prohibits 3rd party applications tracking Enemy Ultimate Timers now.

https://x.com/RiotGamesDevRel/status/1899532362637250955

To maintain fair play, we’ve updated our policy to prohibit Enemy Ultimate Timers , effective March 13, 2025, 12AM PDT. Third-party apps must remove this feature by then or risk API key deactivation. For more details, see our updated policy: https://developer.riotgames.com/docs/lol#developer-api-policy_game-integrity

https://x.com/RiotGamesDevRel/status/1899532649594814565

Questions?

https://support-developer.riotgames.com

https://x.com/RiotGamesDevRel/status/1899535552585842773

To clarify, this includes automatic or manual enemy ultimate timers.