TRTT is described as 'Statistical analysis application that opens, edits and saves SPSS .sav and .zsav data files. It runs as a web app in the browser, with all computation done client-side via WebAssembly, and as a native iPhone/iPad app that shares the same analysis engine, so results are' and is a statistical analyzer in the development category. There are more than 50 alternatives to TRTT for a variety of platforms, including Windows, Linux, Mac, Web-based and Android apps. The best TRTT alternative is R (programming language), which is both free and Open Source. Other great apps like TRTT are RStudio, PSPP, JASP and Positron.