A spreadsheet stores the data.
Xi runs the experiment.
Every experiment-driven team has, at some point, tracked experiments in a Google Sheet, an Excel file, or a Numbers document. It is the right starting point — fast, flexible, free. The reason teams move off the spreadsheet is not the spreadsheet itself; it is what the spreadsheet does not enforce: the contract, the verdict, and the archive that survives more than one person owning it.
Why teams switch from spreadsheets to Xi
A spreadsheet is the cheapest way to start running marketing experiments — and the most common reason teams stop running them three months in. The columns are easy. The discipline is not. Teams move to Xi when the spreadsheet has become a graveyard of half-finished tests with edited thresholds and no verdicts.
- The contract is frozen. Spreadsheets let anyone overwrite a cell. Xi locks the hypothesis, the threshold, and the end date the moment the experiment commits — there is no version-history forensics required to know what was actually agreed.
- The verdict is automatic. No more "did Sarah update the status column?" — Xi runs the rule on the date or the threshold breach and writes the verdict, with the metric series attached as evidence.
- Built-in tools instead of formulas. Sample-size calculation, hypothesis scoring, threshold suggestion — these are part of Xi, not a side tab someone built six months ago and stopped maintaining.
- The agent runs it. Xi exposes a remote MCP server. Claude or Cursor can commit, log, and confirm experiments. Sheets has formulas and an API; no native MCP, no enforced contract.
- Archive that survives a team change. When the person who owned the spreadsheet leaves, the spreadsheet often goes with them — wrong permissions, broken links, undiscoverable. Xi is archive is org-shared and queryable across people and time.
If you run two experiments a quarter and the spreadsheet has not failed you yet, stay. If the spreadsheet has rows where the threshold was changed after the data arrived, switch.
Where the two tools actually differ.
When each tool is the right call.
- You run two or three experiments per quarter and the team is one person.
- You only need to track outcomes; the discipline lives elsewhere.
- You have already invested in a Sheets-based reporting workflow and adding a tool is friction.
- The cost of contract drift is genuinely low for the kind of decisions you test.
- The spreadsheet has rows where the threshold or end date got edited after data came in.
- New people on the team cannot find or read the experiment archive.
- You want sample-size and hypothesis tools built in instead of as separate calculators.
- You want the agent to commit and confirm experiments via MCP.
Common questions, short answers.
Can I export from Xi back to a spreadsheet?
Yes. Every contract and metric series is exportable as CSV or JSON, so spreadsheet-based reporting still works for the audiences who prefer it.
Why not just enforce discipline in the spreadsheet?
Because human discipline against an editable cell loses every time. The value of Xi is that the system enforces what the team agreed to before the data arrived — that is the whole point of a contract.
What about Notion or Airtable?
Same critique applies — see the Notion comparison. Editable databases do not enforce frozen contracts; the unit of work in Xi is the contract, not the row.
Is the free plan really unlimited?
Yes. No credit card, no experiment cap, no archive cap. The free plan is built so that "spreadsheets are free" is not a cost-driven reason to stay on them.
I have a Google Sheet template that works for me. Why move?
If it works, do not move. Xi is for the moment the template stops being honest — typically when one of the rows has a threshold that was rewritten mid-flight. That is the signal, not the row count.
Take one idea. Turn it into an experiment.
Free plan, unlimited archive, no card required. See it in Claude / Cursor / Codex in 30 seconds.