What are some alternatives?
When comparing Google Contacts Map and Highlight, you can also consider the following products
Cardhop - The Mac contacts app you'll want to use.
Highly for iOS - Medium-style highlighting in every app and website. 🖌
Swarmly - Waze for people. See where everyone is in realtime
Liner - Put simply, Liner is a virtual highlighter. It works on PDFs and webpages in the same way a regular highlighter works on books and magazine clippings. Read more about Liner.
The Contact Guru - Managing your contact list so you don't have to
Sheety - Turn any Google sheet into an API instantly, for free. Power websites, apps, or whatever you like, all from a spreadsheet. Changes to your spreadsheet update your API in realtime. Neat