Howie books the meeting. Who makes sure it shows up everywhere?
Howie is an AI assistant you copy on an email, and it finds a time and sends the invite. That is a different job from keeping calendars in agreement. And if your company runs on Microsoft, the published information says Howie is built around Google. Choose by the problem you actually have.
Where the two really differ
Three things that decide whether it works for a company.
Different jobs
Howie negotiates meeting times by email. AddSync Calendar makes sure a meeting exists, once, in every calendar that matters.
Systems
Published information describes Howie as Google only, with no Outlook or Microsoft 365 support. AddSync Calendar connects Exchange Server 2016, 2019 and SE, Microsoft 365, Outlook.com, Google, iCloud, HCL Domino, Zoom and CalDAV or WebDAV servers.
Price you can predict
Howie sells credits, and the cost per meeting is not published. AddSync is priced per account. Basic $3, Silver $5, Gold $8 per account a month, billed yearly ($4, $6 and $10 billed monthly).
Side by side
What is published about each, checked in October 2026.
Who should pick which
It depends on what you run.
AddSync Calendar fits if you
- have Microsoft, Exchange or Domino calendars.
- need the same meeting visible in several systems.
- want a flat price per account.
- do not want an assistant writing to your contacts.
Howie fits if you
- live in Gmail and Google Calendar.
- want someone else to negotiate meeting times.
- schedule many external meetings.
- accept credit-based pricing.
Switching is four steps
Connect
Add Exchange, Microsoft 365, Google, iCloud, Domino or a CalDAV server.
Add people
One by one or from a list. They get an email invite and sign in once.
Choose direction
Per source: one way, the other way, or both ways.
Switch the old one off
Check a week of events, then cancel the old tool.
Questions
Do I need both?
Possibly. Howie books the meeting in Google. AddSync keeps your other calendars in step with it.
Does Howie work with Outlook?
Published information says no. It works with Google Calendar and Gmail.
Where do the Howie facts come from?
From Howie's published information and independent reviews, checked in October 2026. Plans change, so confirm before you decide.
Is there a free trial?
Yes, 14 days.
How is AddSync Calendar priced?
Per account. Basic $3, Silver $5, Gold $8 per account a month, billed yearly ($4, $6 and $10 billed monthly). See the pricing page.
Can I choose which way the data flows?
Yes. For each source you choose one way, the other way, or both ways.
Test it on your own calendars.
Start the 14-day trial, or tell us which systems you run and we will tell you what the sync covers, and what it does not.
