Callum

Callum

AI calendar assistant for teams – supercharge your calendar

353 followers

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).
Callum gallery image
Callum gallery image
Callum gallery image
Callum gallery image
Callum gallery image
Free
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Flowstep
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What do you think? …

Nick Ustinov
Hey Product Hunt 👋 I’m the maker of Callum. Callum adds an AI layer on top of your work calendar to make scheduling simpler and more intuitive. Instead of clicking through calendar UIs or coordinating manually, you can just tell Callum what you want to do and it takes care of the rest. It is built for work schedules and understands multi-person meetings, shared availability, and real scheduling constraints on Google Calendar. We are launching today on web and iOS. Slack and ChatGPT integrations are coming shortly so Callum can fit naturally into your workflow. I would love feedback from anyone who manages a busy calendar or schedules with teams. Happy to answer any questions. Nick
Zolani Matebese

@nick_ustinov1 Hi Nick, Congrats on the launch. Cool little tool. Any chance of support for MS teams?

Nick Ustinov

@zolani_matebese Yep, that's coming – working on Microsoft Outlook integration!

Zen Lenon

@nick_ustinov1 Let's gooooo! Excited to try this.

Nick Ustinov

@zencachola Saves 4-5 hours per week, for busy folk :) Let me know how it goes!

Temitope Okunsanmi
@nick_ustinov1 Congratulations on the launch. As someone who's had to coordinate meetings with several other busy people I understand the struggles that come with it. It's part of why I now try to avoid hosting meetings when I can 😅 I can see you intend to build long term with a few integrations coming soon, genuine question though, have you given some thought into how you logo and visual identity could scale with your business.
Anupam Singh

Turning scheduling into a conversation instead of a UI maze is a smart move.

Looking forward to the Slack and ChatGPT integrations.

Nick Ustinov

@anupamsingh0211 Appreciate it! Slack is coming soon – will keep you posted 🙌

Petr Antropov

First calendar AI assistant which works properly 🎉🎉🎉 I'll soon stop typing and scrolling and only use voice, such a relief. My favorites are different summaries, searching, adding calls quickly, reminders, and color-coding. I still need to test accessing data via integrations.

Nick Ustinov

@petr_antropov1 Thanks Petr! 🙌 Voice-only life is the dream – soon we'll all forget how to type 😅 Let me know how the integrations go – happy to help if anything acts up 🙏

Curious Kitty
When a team is already using tools like booking links, Google’s native scheduling, or calendar-optimization apps, what’s the clearest “switching trigger” where Callum is meaningfully better—and what does Callum intentionally not try to do?
Nick Ustinov

@curiouskitty Great question! The switching trigger is usually when scheduling stops being simple - coordinating across multiple people, time zones, or needing context from other tools (CRM, ATS). Booking links work great for 1:1 external meetings, but fall apart with group availability or internal coordination.


What we intentionally don't do: auto-scheduling your entire day or moving things around without asking. Callum is your assistant, not autopilot – you stay in control.

Kristaps Lapins

Going to try this for my challenge — scheduling across time zones and multiple teams, 15 emails deep, trying to find 30 minutes that works for everyone.

If it handles multi-person availability well, that alone is worth it. Congrats on the launch, Nick.

Nick Ustinov

@kristaps_lapins1 That's exactly what it's built for! Let me know how it goes – happy to help if anything trips up 🙏

Mikhail Fedorinin

Congrats on the launch. It looks very ambitious!

Nick Ustinov

@mikhail_fedorinin Thank you! Lots more to come 🚀

Zeiki Yu

Congrats on the launch! Callum looks like a strong AI layer for real-world, multi-person scheduling across teams.

Nick Ustinov

@zeiki_yu Thank you! Multi-person scheduling is where the magic happens 😄

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