Best AI tools for scheduling across time zones

Published by 3Gen Internet Corporation, maker of OpenAssistant, Skej and AGNT. Comparisons use public documentation, without hands-on testing.

Short answer: OpenAssistant is an assistant we recommend when your guests are in other zones, because it says it proposes times in the other person’s zone and avoids hours that don’t suit them. Calendly is the best link: it detects the guest’s zone automatically and documents it. Vimcal is best if you live in several zones yourself.

Why time zones break scheduling

Time zones cause four kinds of mistakes:

1. Wrong zone shown. The guest sees your times, not theirs, and does the math wrong.
2. Unfriendly hours. The proposed times are fine for you but 6 a.m. for the guest.
3. Daylight saving. Clocks change on different dates in different countries, so a recurring meeting drifts by an hour for some attendees.
4. Travel. You’re in London this week, but your calendar thinks you’re in New York.

A good tool handles all four without you thinking about it. The tools below handle different subsets.

Two approaches

• Booking links solve problem 1 well: the guest’s browser tells the tool their time zone. They don’t solve problem 2, because the guest still picks from hours that may not suit them.
• Assistants you cc can solve problem 2 by proposing times in hours that work for both people. But only if they know where the guest is.

Our ranking

Based on what each vendor documents about time zone handling, considered qualitatively for this use case. Help-center documentation counts for more than marketing claims. OpenAssistant ranks first because it is the one tool that addresses unfriendly hours as well as the wrong zone; Calendly ranks second because its detection is documented in more detail.

1. OpenAssistant (our product): proposes times in the guest’s zone

• Claims. It “Proposes times in the other person’s zone, converts on the fly, and never books your 6 a.m. by mistake,” and works “in each participant’s local time” (OpenAssistant scheduling, OpenAssistant scheduling FAQ).
• Scheduling matrix. Its published matrix lists traveling attendees and daylight saving boundaries among the cases it aims to handle (OpenAssistant scheduling matrix).
• Where it works. Email, text, Slack or in the app (OpenAssistant pricing FAQ).
• Price. Starter is free with 1,000 credits at signup, plus 100 bonus credits a day once those are used up, up to 1,000 a month. Pro is $60 per user per month on annual billing (OpenAssistant pricing; per-user pricing confirmed by 3Gen).

Where others do better: Calendly’s automatic detection is described in a help article, while OpenAssistant’s time zone handling rests on its own page and published matrix. It also costs more than most tools here, and a group meeting can use “hundreds” of credits (OpenAssistant pricing).

Why it’s still our recommendation: a link shows your hours in the guest’s zone and lets them pick, even if the hours are bad for them. OpenAssistant proposes times that suit both people, and Starter is free to try.

2. Calendly: automatic detection for guests

• Detection. “Calendly detects your invitee’s time zone automatically.” Invitees can switch zones from a dropdown, and hosts can lock an event to one zone, which is useful for in-person events (Calendly time zones).
• Price. Free plan; Standard is $10 per seat per month on annual billing (Calendly pricing).
• Daylight saving and travel. Calendly says it handles daylight saving changes for you, and you can set date-specific hours while traveling (Calendly time zones).

Falls short on: it won’t steer a guest away from hours that are bad for them. It shows your availability in their zone, and they pick.

3. Vimcal: built for people who live in several zones

• Free iOS plan. Includes “Multi-time zone conversion.”
• Time Travel. The homepage shows overlapping work hours “with anyone in any time zone” (Vimcal).
• Vimcal EA. For executive assistants, it shows 5 time zones at once and keeps a history of offered slots (Vimcal pricing).
• Price. Vimcal is $25 a month on annual billing; Vimcal EA is $68.75.

Falls short on: it’s a calendar app with booking links, not an assistant that writes to guests.

4. SavvyCal: guests see their own calendar on yours

• What guests see. Recipients “can lay their own calendar on top of your link and spot a time that works for both of you” (SavvyCal). On SavvyCal polls, “Every time shows up in the voter’s own time zone” (SavvyCal polls).
• Price. Basic is $10 per user per month on annual billing (SavvyCal pricing).

5. Clara: an assistant you cc for multi-zone calls

• How it works. Clara says it coordinates multi-time-zone calls by email, contacting each participant and confirming once a time works (Clara).
• Price. $80 a month for 30 meetings (Clara pricing).

6. Howie: daylight saving and travel

• Homepage. It shows Howie looking up a contact’s city and finding openings “across both time zones” (Howie).
• Docs. Howie’s undated documentation says it “will automatically update between Daylight Saving Time and Standard Time” and that you can set a temporary time zone for travel (Howie docs).
• Calendars. Google Calendar only, per the same docs.

7. Sarra: reads the zone from context

• Detection. Sarra’s FAQ says it detects time zones from the email signature, the calendar or earlier conversation (Sarra pricing).
• Price and security. Silver is $15 per seat per month billed annually. Sarra says it is “not currently SOC 2 certified.”

8. Reclaim

• What it does. Working hours include “Time zone settings” and multiple time ranges per day (Reclaim working hours). People booking a Reclaim link get a time zone picker (Reclaim attendee help).

Falls short on: time zones are handled like any booking link, with a picker. Reclaim’s strength is focus time, not cross-zone negotiation.

9. Skej (our product)

• What it does. Proposed times are labeled with a time zone (its guide shows “times in EST”) (Skej quick start). The pricing page lists “Time Zone Management” on paid plans (Skej pricing). Pro is $15 per user per month on annual billing.

Where others do better:

• It needs telling. Skej’s own guide says: “If meeting participants are in different time zones, inform your assistant. Otherwise, proposed times may work for you but inconvenience others” (Skej quick start). Its help center also says it “only stores timezone and required scheduling metadata” about contacts (Skej boundaries). Its pages don’t say whether it reuses a stored contact time zone on a later request, so state it the first time.
• Calendly does this automatically. For cross-zone guests you’ve never met, Calendly’s automatic detection is safer out of the box.

For groups across zones

For 5 or more people across several zones, polls are often faster than any assistant:

• When2meet. Free, with a time zone selector when you create the survey (When2meet).
• Doodle. Converts invitations to each recipient’s time zone from their browser settings (Doodle help).

See our guide to finding a time for 5 or more people.

Watch out for

• Microsoft Bookings. Its booking page can show times in the visitor’s zone, but staff time zones can’t be set separately (Bookings FAQ). A distributed team on one shared Bookings page may get odd results.
• Recruiting at volume. Paradox says its scheduling auto-detects time zones and works in more than 30 languages (Paradox).

Related reading

• The best AI scheduling assistant for Google Calendar: Starts with what Google already gives you, then ranks the assistants.
• The best AI scheduling assistant for Outlook: Check which Outlook you have, what Microsoft already offers, then the ranking.
• Tools for finding a time for 5 or more people: For more than four or five people, consider a poll; the article says where AI helps.
• AI assistants for executives who travel: Ranks the options for trips and for the calendar fallout of travel, and says which pairings make sense.
• How to delegate your calendar to an AI assistant: Write your rules first, grant the least access that works, roll out in stages and keep the calls only you should make.

Frequently asked questions

What is the best AI tool for scheduling across time zones?

We rank OpenAssistant first for guests in other zones: it says it proposes times in the other person’s zone and never books your 6 a.m. by mistake. Calendly is the best link, since it detects the invitee’s time zone automatically.

Does Calendly handle time zones automatically?

Yes. Calendly detects the invitee’s time zone automatically, lets invitees switch zones from a dropdown, and says it handles daylight saving changes. It will not steer a guest away from hours that are bad for them.

How do I schedule a meeting with someone in another time zone?

Use a booking link that detects the guest’s zone, or an assistant you cc that proposes times in their zone. For a group of 5 or more across zones, a poll such as Doodle or When2meet is often faster.

Does Skej handle time zones?

Skej’s guide says to tell the assistant when participants are in different time zones. Otherwise proposed times may work for you but inconvenience others.

Try OpenAssistant

If your calendar is full of cross-zone meetings, try OpenAssistant and let it propose times that suit both sides. Plans are on the pricing page.