Quip is a new form of document like Coda. They are focused on chat and workspace collaboration, especially connecting to the rest of the Salesforce ecosystem (acquired 2012).
You can insert stand-alone things like calendars and tables, but the data sits there and can't be changed for different audiences. Copy and paste your Quip docs into Coda and everything (except for custom objects like calendars) will come over nicely.
Both tools are in the similar space of a writing surface where you can track and visualize data, though Notion starts as a wiki whereas Coda begins as a doc. Our clients have found docs to be more familiar with their teams, especially as they grow.
Makers often hit limits when building internal tools in Notion, so they move to Coda for a rich formula language and building blocks like buttons, charts, and Packs (integrations) that can really grow a doc into an app.
Copy your words and tables from Notion into Coda and find the logical points to make new docs.