When the spreadsheet stack
stops scaling.
70% of mid-market finance teams still run on Excel. It works — until headcount, entities, or board cadence breaks it. NashOS is the AI-native upgrade for teams that have outgrown the spreadsheet but can't justify Anaplan.
Side-by-side
| Capability | NashOS | Excel |
|---|---|---|
| Setup time | Hours | 0 (already there) |
| Commercial model | Quoted to your entity count and volume | $0–$22 (M365) |
| AI agent | 45 tools · plain-English reads, drafted writes | Copilot bolt-on (read-only on data) |
| Forecast algorithms | 15 · one-click compare | Manual / add-in |
| Audit trail | Per-save log · before/after on most draft edits | OneDrive version history |
| Multi-entity consolidation | Automated (10-dim cube) | Manual cross-sheet rebuilds |
| Variance investigation | Seconds via chat | Hours of manual drill-down |
| What-if scenarios | Live slider · saves stack | Copy sheet, change inputs, hope |
| Multi-user collaboration | Concurrent · roles + dimension scopes | Sequential edits, conflict files |
| Best fit | FP&A teams · multi-entity | Solo bookkeeper · simple co |
What changes when you leave Excel
Excel doesn't break. Until it does.
Three months of growth, one acquisition, or one new entity later — and the workbook starts crashing, the consolidation breaks, and one bad =SUM() ruins the variance pack. We've all lived this. NashOS is what you migrate to when the spreadsheet stops scaling.
An audit log, not file versions
OneDrive version history keeps earlier copies of the whole workbook. NashOS keeps a log instead: edits committed from a Nash draft card record their actor and timestamp, most with before/after values — filterable, exportable, and never removed by retention — and every grid save and bulk load is recorded with who saved it, when and how many rows it inserted or updated.
Copilot reads. NashOS writes (safely).
Excel Copilot can summarize a range. The NashOS agent reads the plan and drafts changes to it — "hire 3 engineers and show the impact" previews the change on the plan, and saving it is a draft you confirm before commit. No silent edits. Every committed draft is recorded with who posted it and when, and an administrator can revert a figure edit posted from a Nash fact draft card.
Variance investigation in 30 seconds
EBITDA off this month? Ask the chat. It pulls the top contributors ranked by financial impact, drills down, and gives you the answer with one click to drill further. The hours-of-VLOOKUPs ritual is over.
NashOS is for you if
Your close has slipped past 8 days, your variance pack takes longer than the meeting it serves, and one broken formula has cost you a board cycle. You want auditability, not version history.
Stay in Excel if
You're a solo bookkeeper or a sub-10-person company with one entity, no consolidation, no board pack, and no plans to grow into needing them. Excel is fine.