Bounded memory
Index and stream where practical instead of materializing multiple full copies of the table.
Built for working files, not a largest-file contest
CSVProof is designed to stay useful when a CSV outgrows a comfortable spreadsheet workflow, without making an unverified gigabyte claim the product story.
Private early access · macOS & Windows
vendor-export.csvRead in bounded chunksraw file stays local
ParserStreaming
GridVirtualized
ChangesJournaled
OutputNew file
Fast enough to finish the real job
Opening a large file is only the first checkpoint. A credible large-file workflow must also search, filter, compare, edit, save, recover and verify the output without hiding skipped records.
No invented file-size ceiling.
CSVProof will publish limits only after repeatable tests on named hardware, versions and fixtures. Current product previews are not performance benchmarks.
How large-file performance will be measured
The methodology reports time, memory and correctness together. A fast open that silently drops data is not a pass.
StageMeasureCorrectness check
OpenFirst usable grid · full parse/indexRows, columns, malformed records
WorkSearch · filter · keyed compareExact matches and result counts
EditSingle and scattered changesBefore/after logical diff
SaveDuration · memory · scratch diskOutput parse, hashes, recovery
Planned corpus tiers: 100 MB, 1 GB, 5 GB and 10 GB on documented Mac and Windows hardware. Results will separate direct observations from vendor claims.
Scale without weakening the contract
Immediate inspection
Show a usable grid and parser state before every background task has finished.
Safe release
Journal edits, write a new output atomically, and verify counts and hashes at completion.
Strong large-file tools already exist
Modern CSV, SmoothCSV and Caxton already make credible large-file claims or show strong performance. CSVProof’s reason to exist is the controlled path from parser contract to exceptions, repeatable recipe and evidence, not “largest file wins.”
Work with consequential files, whatever their size
CSVProof is currently in private early access for macOS and Windows.
Get early access