Callum

AI calendar assistant for teams – supercharge your calendar

by Nick Ustinov·Productivity·tracked since Sep 25, 2026
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Monthly revenue–Not shared yet
Rank–Unranked
Last 30 days–Growth in MRR
Revenue per founder–1 founder

About Callum

Callum is an AI calendar assistant built for teams using Google Calendar. It understands multi-person meetings, shared availability, and real-world scheduling constraints. Use natural language to schedule, reschedule, and manage meetings without back-and-forth emails or manual calendar admin. Boost Callum knowledge by connecting your CRM, ATS, CSM apps. Available on Web, iOS, Slack and ChatGPT (soon).

Launch traction

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258

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Questions

Who founded Callum?

Callum was founded by Nick Ustinov.