GalaxyGridBROWSER DEMO● Your private, temporary workbookBook a desktop demo ↗

GO AHEAD. CHANGE SOMETHING.

A workbook you can actually use.

Edit a price, enter a formula, calculate indicators and explore the result.

Untitled · FAKE stockStarting…
FAKE stockTemporary · not savedH2
Creating your workbook…

Browser preview. Calculations run in your browser, using a limited JavaScript demo engine. This is not the Windows Qt/DuckDB application, and browser timings are not desktop benchmarks.

Each tab gets its own workbook in memory. Refreshing discards edits. No workbook files, accounts, uploads, exports, custom Python, AI, workflows or schedules are used. The website host may retain ordinary access logs.

Make it your experiment.

  1. Select H2, change the Close price in the formula bar, and press Enter.
  2. Select J2, enter =H2*I2, then choose Fill formula down.
  3. Choose Calculate 12 indicators for moving averages, EMA, ATR, VWAP and Bollinger bands. Your custom cells take priority; reset for an untouched indicator dataset.
  4. Choose a column, then sort, filter or chart it. Charts show up to 300 sampled points from the current view.
  5. Try 100,000, 1,000,000, or one billion worksheet rows. The billion-row option generates source values on demand and stores scalar formula patterns compactly. It does not materialize or scan one billion cells. A reset creates a fresh workbook.
  6. For the billion-row test, generate the compact dataset, set A2 to =ROW() and fill to row 1000000000. Set B2 to =ISEVEN(A2), then fill B. Try C2 as =IF(B2,A2*2,A2-1). Jump to A1000000000 to inspect the last row.

Custom formulas support arithmetic, comparisons, SUM, AVERAGE, MIN, MAX, ABS, ROUND, ROW(), ISEVEN and IF. They reference columns to their left; range formulas are limited to 1,000 rows. Compact fill supports scalar formulas in A:U. Calculated results are evaluated on demand. Full sort/filter and indicator scans are capped at one million data rows; sampled charts and direct cell access work across one billion worksheet rows.

Fill your formula

The first cell stays the anchor. Relative row references move down; $ references stay fixed. Data row 10,000 is worksheet row 10,001.

Column chart