I’ve tried around a dozen apps but haven’t found anything usable or doesn’t have some arbitrary limits / mandatory on-going fees for some unmaintained app.
It may not be exactly what you want, but I tend to use OpenOffice (or LibreOffice) Draw. It supports numerous shapes and more importantly connectors between shapes, as well as adding custom connection points to shapes.
Not as good as Pre-MS acquisition Visuo was, but I prefer Draw to MS Visio (though haven't used it in a while).
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[ 4.7 ms ] story [ 19.4 ms ] threadI found it with DuckDuckGo of all things. The IAP search only found freemium and payware apps that weren’t great.
Others tried:
https://apps.apple.com/us/app/ithoughts2go/id918458207
https://apps.apple.com/us/app/coggle/id1187423011
https://apps.apple.com/us/app/fluent-mind-map/id645539191
https://apps.apple.com/us/app/xmind-mind-map/id1286983622
https://apps.apple.com/us/app/mindnode-6-mind-map/id12187180...
https://apps.apple.com/us/app/lucidchart/id611543423
(I can’t afford OmniGraffle)
Not as good as Pre-MS acquisition Visuo was, but I prefer Draw to MS Visio (though haven't used it in a while).
See: https://www.libreoffice.org or http://www.openoffice.org