GT2 was a personal ecological accounting domain which was a 2 thing by virtue of the first Android Green Travel Calculator, c. 2011 to which it bears at most a slight and thematic resemblance since the former basically did nothing but track GPS, the core physical sensing function needed to estimate travel related carbon footprint.
Its first complete release was in 2021 but that version required foreground operation, limiting its usefulness. The 2.0.8 release stalled in late 2022 adds background operation and is the end of GT2 which will be maintained n my repo for maintenance and security changes only. It was released in June 2026 on Play and App Store as GT2 3.0.1 with more additional features than just background ops and is based on the DS common app platform.
Versions 3.0.n will update GT2 for accuracy and to keep the stack current but it is feature complete.
Versions 3.1.0 and later are styled GT3, Personal Carbon App and are in the Personal Motion Tracking Apps line. It will be continuously developed with new function highlighting DCP/MCP starting with automated tracking and full carbon accounting in the OS ledger system.