A spreadsheet that checks its own work.
Profile the export, fix the types, write real formulas, chart the answer — then recompute every row and re-derive the totals a second way, because a confidently wrong model is the expensive kind.
Free to download, free to model in. AI features draw on your allowance.
- Opens
- .xlsx · .csvAnd the exports that are almost neither
- Writes
- Real formulasNot pasted-in results
- Modelling costs
- Nothing, everNo account needed to build
- Runs
- On your machineYour data stays local
The export is never the data you wanted
Numbers stored as text, duplicate rows, blank keys, three spellings of the same customer. The assistant profiles the sheet first and tells you what is wrong before it changes anything.
- Duplicates, blanks and type problems found by reading, not guessing
- Retype a whole column in one step
- Split, merge, transpose and map values
Real formulas, filled down and explained
It writes the formula into the cell rather than pasting a computed number, so the model still works when the data changes — and it can show you the lineage of any cell.
- Named ranges, lookups and goal seek
- Inspect what feeds a cell and what depends on it
- AI columns for classify, extract and summarize
Charts that read as an answer
Not eleven colours and a legend nobody can parse. The chart is chosen for the question, labelled properly, and legible in both light and dark.
- Chosen to fit the comparison being made
- Pivots and grouped summaries
- Dashboards with slicers and filters
It reads the numbers back
The most dangerous spreadsheet is one that is confidently wrong. After building, the assistant recomputes the values and re-derives the totals a second way, then fixes what does not reconcile.
- Recomputes rather than trusting its own formula
- Re-derives totals independently
- Reports what did not reconcile instead of hiding it
verify_sheet8,198 rows recomputed · totals reconcilecross_checkRe-derived the total a second wayIt can reach your other files
The cost basis lives in a document, the prices in another workbook, the contract in a PDF. The assistant reads all of them so “margin” means the same thing here as it does everywhere else.
- Search your library by meaning
- Read documents and PDFs as sources
- Start from a template that matches the job
A model somebody else can read
Turn the finished workbook into a dashboard with slicers, filters and tiles — then share it as a link to someone who has nothing installed.
- Tiles, slicers and hierarchy filters
- Reader personalization without breaking your model
- A view-only link, or a memo written by LumenDocs
How LumenAgent works in here
Watch it build the model — and stop to ask you.
A real run: it profiles the sheet, reads the cost basis out of your library, and waits for you before it deletes a single row. Decline and it flags them instead — a genuinely different outcome.
One app, every editor
The numbers usually have to leave the sheet.
LumenSheets is one editor inside LumenQube. The agent reads your whole library and hands finished work to any other editor’s own agent — so the memo, the deck and the sheet cannot drift apart.
Typed as text, duplicated, and disagreeing with the contract. Profiled before anything is touched.
The agreed cost basis is in a PDF. It is read, not guessed at.
Written by LumenDocs, with every figure cited to the cell it came from.
Same numbers, built by LumenSlides with its own charts and speaker notes.
The full toolkit
Everything LumenSheets does, and all of it free.
Six groups. No row limits, no watermark, no upsell in the middle of a model.
Read & profile
Know the data before changing it.
- Profile — types, blanks, duplicates, live statistics
- Inspect — what feeds a cell and what depends on it
- Aggregate — group and summarize without a pivot first
- Find rows — by condition, across sheets
Prepare
Shape it into something usable.
- Types — retype a column in one step
- Duplicates & blanks — found, then removed or flagged
- Restructure — split, merge, transpose, map values
- Connections — refreshable external data
Build
Real modelling.
- Formulas — written into cells, filled down
- Named ranges & lookups — models that read cleanly
- Goal seek — solve for the input you need
- AI columns — classify, extract and summarize in bulk
Visualize
The answer, not the data dump.
- Charts — chosen for the comparison being made
- Pivots — grouped summaries that stay live
- Dashboards — tiles, slicers and filters
- Conditional formatting — where the eye should go
Verify
The part most tools skip.
- Recompute — read every value back after building
- Cross-check — re-derive the total a second way
- Quality & performance — checks on the finished dashboard
- Accessibility — colour and label checks on every chart
Hand it on
Out of the workbook.
- Export — .xlsx and .csv, formulas intact
- Delegate — a memo, a deck or a report from the same figures
- Share — a view-only dashboard link
- Automate — turn the whole clean-up into a LumenFlow
LumenSheets · common questions
Does it write formulas or just paste in the answers?
Real formulas, written into the cells and filled down, so the model still works when the data changes. You can inspect any cell to see what feeds it and what depends on it.
Will it delete rows without asking?
No. Reading and profiling run freely, but the first change that removes data pauses and asks — that is the gate in the demo above. Decline and it flags the rows instead of deleting them.
How does it know its answer is right?
It reads the computed values back after building, and re-derives the totals a second way rather than trusting the formula it just wrote. Anything that does not reconcile is reported, not hidden.
Can it open my existing spreadsheets?
Yes — .xlsx and .csv, including the awkward exports that are nearly neither. Formulas, formats and multiple sheets come through.
Is there a row limit?
No. Opening, editing and modelling are free with no row cap; only the AI features draw on your allowance.
Download
Trust the model again.
One download, every editor, and an agent that asks before it deletes anything.
Free to download, free to model in. AI features draw on your allowance.