About Spell Toolkit
Spell Toolkit is a small collection of browser-based utilities, built by someone who spends their working day in spreadsheets, SQL and BI tools and got tired of the free tools that almost work.
The problem with most free tools
Search for almost any small utility and you will find a dozen versions of it. Most handle the demonstration case and fail on real data. They mangle a column pasted out of Google Sheets. They think 1,000.50 and 1.000,50 are different numbers. They treat Bob@Example.com and bob@example.com as two different customers. They never tell you what rule they applied, so you cannot tell whether the answer is right.
How these are different
Each tool here documents every assumption it makes about what counts as a match, because that is the part that determines whether the result is correct. The awkward cases — accents, locale number formats, spreadsheet pastes, blank rows, capitalisation — are treated as the actual work rather than as details to skip.
How it is built
Static HTML, CSS and JavaScript, served from a CDN. No server application, no database, no accounts, no file uploads. Every tool does its work inside your browser tab, which makes the pages fast and means your data is private as a matter of architecture rather than as a promise. The only webfont is one display face used for headings, served from this domain rather than from Google’s; everything you actually read is set in the fonts already on your device and downloads nothing.
How tools get chosen
Slowly, and from evidence. A tool gets built when there is real demonstrated demand for it and we can make it meaningfully better than what already exists — not because it would be quick to add. The list stays short on purpose.
If something you need is missing, or a tool here gets an edge case wrong, please say so. Early feedback has an outsized effect on what gets built next.