SYNCDATE
OneCal.io
Calensync
ChronoLink
SyncThemCalendars
Multical
CalendarBridge
SyncGene
eM Client
Thunderbird
Mailbird
Microsoft Outlook
Postbox
Apple Mail
Mailspring
Evolution
SYNCDATE is a web application for live two-way Google Calendar synchronization. Connect multiple Google accounts, select which calendars to sync, choose direction (one-way or two-way), and SYNCDATE keeps events aligned automatically in the background.
Built for professionals juggling multiple Google calendars across work, personal, and side-project accounts.
Outlook support with cross-provider sync - coming soon.
โ all major services supported (including Gmail, Exchange, iCloud, and Outlook365) โ automatic set up for most email services โ simple and fast data import from all major email apps (including Microsoft Outlook, Outlook Express, Windows Mail, Thunderbird, Incredimail and more). โ touch support for touch-enabled laptops, tablets and hybrid devices โ super-fast search that finds any email, contact or attachment in seconds โ Online Meetings support (for Zoom, MS Teams, Google Meet) โ unique email features, such as Watch for Reply, Snooze Email, or Send Email Later โ the interface is customizable in the most comprehensive way on the market (including custom themes and an advanced visual Theme Editor)
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SYNCDATE's answer
SYNCDATE treats sync as silent infrastructure โ it shows proof instead of making promises. Every sync run is logged with stats, every error comes with a deterministic fix step, and every sync can be cleanly reversed with optional event cleanup. Most calendar sync tools are black boxes. SYNCDATE exposes sync health, freshness, and latency so you can verify it's working in seconds, not just hope it is.
SYNCDATE's answer
A generous free-forever tier (2 accounts, 2 calendars) covers the most common use case at zero cost โ competitors start at $4โ12/mo. Privacy is the default: synced events show as "busy" unless you opt in to detailed copying. And if you ever want to stop, the Clean Exit flow removes all SYNCDATE-created events from your calendars โ no orphaned copies left behind.
SYNCDATE's answer
SYNCDATE's answer
SYNCDATE was born from a real problem: juggling multiple Google accounts and constantly getting double-booked because calendars didn't talk to each other. Existing tools were either expensive for what they offered, opaque about what they were doing, or left orphaned events behind when you stopped using them. SYNCDATE was built to be the sync tool we wanted โ minimal, transparent, and safe to turn off.
SYNCDATE's answer
Next.js (App Router) with TypeScript, PostgreSQL via Drizzle ORM, Redis with BullMQ for background job processing, Google Calendar API with webhook push notifications, and Stripe for billing. Deployed on a Hetzner server behind Cloudflare with a standalone Node.js worker for sync execution. Observability stack uses Grafana, Loki, Prometheus with PagerDuty for alerts.
Based on our record, eM Client seems to be more popular. It has been mentiond 4 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Also, if you're also trying to use Xtra email in Microsoft Outlook, also expect problems. Outlook is also crap. There are other email application options. Em Client (emclient.com) is an excellent alternative to Outlook. Source: almost 3 years ago
Totally agree on the security risk. On the other hand setting up, maintaining and explaining PGP for non-technical users usually leads to not using encryption at all, which is by far less secure than a self-managed PGP gateway on a private mail server setup. I'm aware of the few UX friendly implementations like eM client or pEp, but even those are for most not easy or "automatic" to use. (especially without good... Source: over 4 years ago
I use EmClient for my email/calendar on Windows desktop. Source: over 4 years ago
There is Thunderbird email client (Free) and Em Client (free for 2 email addresses) as well. Source: over 4 years ago
OneCal.io - Sync Outlook and Google Calendars in real-time, share booking links, and view all your calendars in one view.
Thunderbird - Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!
Calensync - Synchronize your Google, Outlook, and iCalendars instantly, and create scheduling links to easily book events based on your availability
Mailbird - Mailbird is the best email client for Windows 7, 8 and 10
ChronoLink - Flexibly synchronize events between different calendars. Select and transform events according to your rules. Supports Google, Microsoft (Outlook.com / Exchange Online), Exchange Server, iCalendar/ICS and other systems.
Microsoft Outlook - Organize your world. Outlookโs email and calendar tools help you communicate, stay on top of what matters, and get things done.