Free desktop app. Excel-compatible. Talk to the Agent in plain language — or write the formula yourself. Excel, Python, SQL, all in cells you can see and edit. Built for billions of rows. Run on your laptop, your cloud, or air-gapped on-prem — never locked to a vendor.
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You
> Forecast Q3 revenue from the monthly history in column A
Expanse
I see 48 months of revenue in A1:A48 with mild seasonality.
Fitting an ARIMA(2,1,1) model in a Python cell and writing the
forecast to B49:B54.
✓ B49:B54 Sandboxed Python in cells
✓ Forecast $284k → $312k (+10% over Q3)
You
> Plot it against history
Expanse
Inserted a line chart spanning D2:K22 with two series:
✓ Historical blue, A1:A48
✓ Forecast orange, B49:B54
Click the chart to tune colors, axes, or annotations.Spreadsheets are the most-used programming language on Earth — but they've barely changed in forty years. Excel locks you in. Google Sheets caps your rows. Notebooks scare your finance team. The right tool for any given task usually isn't a tool at all — it's a workbook that nobody else can run.
Expanse is a spreadsheet you already know how to use. The Grid is a Grid — cells, formulas, ranges, charts. What's new is the Agent. Tell it what you want in plain language ("forecast Q3 revenue", "find duplicates in column B", "model the new pricing tier") and it writes the formula into cells you can read, edit, and audit yourself.
Behind every cell are 345 Excel functions, a sandboxed Python runtime with numpy/pandas/polars, and SQL at terabyte scale. Your workbook stays a single .xlsx — round-trippable into Excel, version-controllable in git.
Run it wherever you want. Native desktop on your laptop. Self-hosted on AWS, GCP, Azure, Cloudflare, your own datacenter, or air-gapped behind a firewall. Or use our hosted version. No vendor lock-in — your data, your cloud, your rules. Compare to Row Zero, Snowflake notebooks, or any other "cloud spreadsheet": your workbook never has to leave your perimeter.
Why Expanse
Replaces
Ask the Agent for what you want — or write the formula yourself if you'd rather. Excel for the model your CFO can read. Python for the analysis your data scientist already wrote. SQL for the warehouse you can't fit in memory. AI for "I'll know it when I see it."
Stop bouncing between tools. Stop exporting CSVs back and forth. One workbook, one dependency graph, four ways to express what comes next.
A1 Jan 2024
A2:A12 Feb 2024 ... Dec 2024
B1:B12 124,000 128,500 135,200 ... 197,800
B13 =SUM(B1:B12)
B14 =AVERAGE(B1:B12)
B15 =NPV(0.08, B1:B12) - Investment
B16 =IRR(B1:B12) * 100
B17 =PMT(0.05/12, 360, -300000)
B18 =VLOOKUP(D1, Products!A:E, 5, FALSE)
B19 =SUMIFS(Revenue, Region, "EMEA", Quarter, "Q4")
B20 =FORECAST.ETS(D1, B1:B12, A1:A12)
B21 =IFS(B19 > 1e6, "high", B19 > 5e5, "med", TRUE, "low") VLOOKUP, MATCH, INDEX/MATCH — the workhorses of every real workbook, and the slowest functions in the language. Every recalc re-walks the entire searched column, for every formula that points at it. K formulas times N rows. K × N per recalc, growing every time the data grows or another formula gets added.
Expanse indexes each column once and shares the index across every lookup that searches it. Edit a cell elsewhere in the workbook? Your million-row MATCH stays warm. Edit a cell inside the column? The index rebuilds once — not once per formula. The total work drops from K × N to N + K.
The result: sub-millisecond lookups on workbooks where linear-scan engines slow to a crawl.
Cost per recalc — drag to scale
LiveWhat you get
Real-time collaboration
Multiplayer cells, cursors, and history.
Native + browser
Mac, Linux, Windows — and your browser, soon.
Deploy anywhere
Your laptop, any cloud, or air-gapped on-prem. Never locked to a vendor.
Open core
Open-source UI under AGPL-3.0. Free desktop, no account required.