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ZetaJS is a browser-based version (using LibreOffice WebAssembly) - that should work (tm) on all reasonably modern browsers, including iOS. But see compat matrix for details: https://webassembly.org/features/

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The Calc demo seems to fail on iOS.

If you could file an issue please, at https://github.com/allotropia/zetajs/issues (with os version & hardware, if relevant)?

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