Powerlifting programming isn’t as complicated as spreadsheets make it look; once you strip away the noise, the structure fits comfortably on a phone. I think of it as two parts: plain sets/weight/reps/RPE/1RM, and the custom analytics you build on top. SigmaLifting handles the first part entirely on your phone with a mobile-first UI and a flexible data model that can express most spreadsheet-style programs. For the second part, you export the data and run it through your own tools (or an LLM) for whatever analysis you want.