About Callendar
We believe meetings shouldn't slip through the cracks. Callendar puts a real alarm on every meeting — the one reminder your phone isn't allowed to quiet.
Our Mission
Callendar was built because silent notifications get dismissed in a glance and calendars are on mute. Founded in 2024, we're a small team of engineers and designers obsessed with the question: why is a text message a push notification, but a scheduled meeting is too?
Whether you're running back-to-back calls, working in Focus mode, or just have your phone face-down — Callendar rings a full-screen alarm so you never miss a standup, 1:1, or board update again.
6
Alarm ringtones
2024
Founded
2
Native mobile apps
29
Languages supported
Our Values
Reliability
A meeting reminder that fails is worthless. The alarm is scheduled on your device, so it fires with no signal, after a force-quit, and after a reboot.
Privacy First
We read your calendar read-only to schedule alarms. Your events are never sold, shared, or used to train AI models.
Respect for Focus
We only break through silent mode because the meeting warrants it. Quiet hours and per-calendar overrides keep you in control.
A Global Remote Team
Callendar is built by a fully remote team of mobile engineers, product designers, and operators who have lived the pain of back-to-back meetings across every time zone. We know what it feels like to glance up from deep work and realize a meeting started six minutes ago.
That's why we built a reminder that actually gets your attention — a full-screen alarm, not a toast that disappears in half a second.