Best alternatives to Synced in 2026

Scheduling a meeting with more than two or three people usually turns into an email or Slack thread of 'does Tuesday work? What about 2pm?' — especially when the people involved use different calendar systems or work at different companies. Synced tries to skip that entirely: it shows you a color-coded heatmap of when everyone involved is actually free, before you send a single invite. The platform pulls availability from Google Calendar, Outlook, and Microsoft 365 and consolidates it into one cross-provider, timezone-aware view, highlighting the best mutual time slots first. It integrates with Slack so people can ask for a meeting time in plain English and get a suggestion back, and it also exposes an MCP (Model Context Protocol) server, letting AI assistants query availability and propose meeting times directly. The core use case is coordinating across company boundaries — client calls, vendor meetings, partnerships — where you don't have access to the other side's calendar app natively.