xllify is here!

Excel is the original rapid application development tool. People do unholy things to get the job done with no code, or perhaps with just a smattering of VBA. These solutions can be brilliant in the moment but, long term, tend to end up brittle and hard to extend. Over the years there have been many approaches for extending Excel beyond formula soup and VBA. There is the excellent Excel-DNA, PyXLL, Microsoft’s own Office....

February 20, 2026 · Alex Reid

From prompt to Excel custom function in 30 seconds

xllify is a platform I’ve released for creating custom Excel functions by describing what you need or pasting some existing formulas or VBA. The resulting functions get packaged into a ready-to-deploy Office Add-in for all versions of Excel, as well as an optional-extra native XLL build for Windows. Right now you can write your prompt for your functions in a browser or Excel add-in to iterate, debug and even manually code....

February 17, 2026 · Alex Reid

Taming real-time data in Excel with rtd.pub

rtd.pub is a platform for easily connecting any real-time data source to Microsoft Excel. You can write code in Go and Python, or simply configure pre-built open source connectors. This is a design and approach I’ve been mulling over for the past couple of months. I have now implemented it. This, and of course spreadsheets in general, are somewhat boring. However, they’re the original low code/RAD tool: in terms of bang for buck and the control they put into the hands of domain experts, nothing comes close....

July 3, 2025 · Alex Reid