SheetJS

SheetJS offers software for reading, editing, and exporting spreadsheets, used in web browsers and servers. In practice that means building software for you when nothing off the shelf fits.

Who is it for? Mostly companies with a specific process to automate. They also list Software Engineering, so expect those to show up in the feature set. They are a small team, 11 to 50 people, which usually shapes who they work with. You will probably talk to the people who build it, which is great until you need 24/7 support.

SheetJS is based in Rutherford, New Jersey and founded in 2012. Their site is sheetjs.com.

Things worth asking about: portfolio relevance, who owns the code, and how they handle changes. A short pilot with your real data tells you more than any demo.

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