One of the recommendations in the article is to use the App, Cardhop. I checked into it but could not find pricing information from links on their website, and had to do a browser search to find it. Prices are only provided on a monthly basis for both monthly and yearly pricing. I regard this as a psychological trick to make the cost seem low rather than to provide the actual yearly cost with an annual subscription. So here is the information:
While Cardhop is free, the focus of the provider is to integrate it with another App, Fantastical a time management App of which is subscription software for at least $40/year for life. As for me, I am strongly opposed to ANY subscription software that stores my personal data given the fact that if I do not continue to pay I could be blocked from accessing my own data. Doing the math, if you use Fantastical, for 10 years that is at least $400, or more if they raise their prices. Not only that, if the company shuts down or drops the product, how are you going to access your data to transfer, it to another App? While the information is somewhat sketchy it seems that Fantastical will only sync with Apple Apps when the information is also stored on iCloud or some other cloud service such as Google. If you have local calendars on your Mac or perhaps reminders and notes, they seemingly will not be synced, Of course, this means that if your internet connection is down or unavailable your information will not be synced and it also raises privacy and security issues as these days, anything on the cloud can possibly be hacked or open to 3rd party scrutiny. despite providing promising to keep it safe and private. The good news about this is that Fantastical does allow exporting of information into ics, vcf or csv formats appropriately. For me, this would mean having to backup the data on a regular basis by exporting it. For me, the lack of local syncing on my Mac is a big showstopper.