Try It Online
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Try It Online, or TIO, is a website supporting a family of online interpreters maintained by Stack Exchange code golfer Dennis, which can be used to run and share code in many programming languages online. The website provides access to over 600 languages, including the array languages Dyalog APL (as well as Extended Dyalog APL), dzaima/APL, ngn/apl, and J, and the K derivatives ngn/k, Kona, and OK. All languages can be used from any web browser, even on devices that don't have the language installed or aren't supported by the language. The code itself is executed on a server.
Dyalog Ltd. is a sponsor of TIO and promotes it as a way to easily try out APL. (Dyalog also supports its own TryAPL website.)