Product managers
The spec, nextto the numbers.
Open the export from your analytics in the same window as the document that argues about it.
Free and open source. The spreadsheet stays a file on your computer.
Edit the sheet where you write.
A funnel table, a tracker, an export from your analytics. Change a cell without leaving the document.
Ask about the file you have open.
The open file goes with the request, so the agent can write the section that explains the numbers next to it.
Good to know
CSV and Excel
Open, read and edit them in the same window as the spec.
Where the data goes
Only if you ask an agent to read it, and then to the provider you chose.
Diagrams too
Mermaid and draw.io in the document, and in the exports.
Open the spec and the sheet together.
Free and open source.