Every account in one inbox.
All your Gmail and Outlook accounts in a single threaded view. Select many at once, search and actually find things, snooze what can wait, and trash with a real 30-day undo.
The power-user checklist, all present.
These are the features that usually make people crawl back to the provider’s own client. Syncro ships them.
Operator search
from:, subject:, is:unread, has:attachment, before:, after:, label:, and negation. Server-side, across every account at once.
Rules engine
Conditions and actions with run-now, plus an AI dry-run that shows what a rule would catch before you save it.
Undo send
A hold on every outgoing message, with the duration set by you in Settings.
One-click unsubscribe
RFC 8058 support, so newsletters leave quietly without a web form.
Spam and phishing
Heuristics on arrival, and blocking a sender blocks them at the provider too.
Signatures
Several per account, with separate slots for new mail and replies.
Vacation responder
An out-of-office that lives where the rest of your mail settings do.
Invite cards
.ics invites render as real cards in the reader, not attachments to squint at.
Triage runs while you are in meetings.
Walk back into a pre-sorted inbox. Request access.