Free digital/email Save-the-dates recommendations?

You can do a PDF email, or I recommend Paperless Post. There are free designs as well as paid, and you're able to track who has actually opened and seen it.

It’s considered “not popular” due to lack of technology but save the dates for decades have always been free of cost by word of mouth or over the phone. They were and still are very efficient methods of getting the information across to all invited guests at the 6-12 month timeframe.

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Oh, that's an interesting point!

We've definitely told our closest friends and family in person or over the phone/video calls to block the date in our calendars, we were just looking for something a little bit more solid that people could reference if they actually forgot to mark it in their calendars. We don't really see people much currently and about half of our friends and family are out-of-state, but we also don't want everyone to just "spread the word" either since we can't invite everyone due to our venue capacity and just setting a budget.

We figure the majority of our guest list are friends and family our age that are tech-savvy and older family members, we'll also double check with a phone call.