Calerto

Calerto reads upcoming events from Apple Calendar and Google Calendar and sets a real alarm before each meeting, with a prep-time buffer you choose. Presets run from 5 to 60 minutes, and you can type any custom buffer up to a full day. It uses iOS AlarmKit, so the alarms ring through Do Not Disturb and silent mode. Live Activities show your next meeting on the Lock Screen.

You set an alarm with one tap or swipe. Alarms can be paused without being deleted, and recurring events can get repeating alarms. A countdown card shows the next meeting. When an alarm rings, a Join button for Zoom, Google Meet, Microsoft Teams or Webex becomes active five minutes before the start time. Snooze only works until the meeting begins. The Pro tier adds auto-alarms for every meeting in the next seven days and connections to more than one calendar.

Calendar data stays on the device, and the App Store listing says no data is collected. Calerto runs on iPhone, iPad and Mac and needs OS version 26 or later. The app is free to download. Pro costs $2.99 a month, $12.99 a year, or $24.99 for lifetime access.