You add a single custom field and immediately have tags. I've tried all of the CRMs and various combinations but what I love about Pipedrive is that:
1. You can integrate with Zapier (just like Airtable and the others)
2. Their email integration with Gmail enables you to create a filtered "pipeline inbox"
3. You can have tags :) I definitely think it's a requirement.
4. Their mobile app is one of the best. Seriously, how can you have a CRM that's not on mobile?
I will add that Airtable has much more powerful Zapier integrations than Pipedrive. For whatever reason, a lot of the Pipedrive endpoints haven't been added so there are definitely edge cases that won't work easily. However for the most part, it's the best one on the market.