Why We Built Peptra Instead of Using a Spreadsheet
This isn't a comparison post (we built Peptra, so we're biased). It's an honest answer to a question we get often: why does a peptide tracker need to exist when spreadsheets and habit-tracker apps are right there?
Spreadsheets
Pros: free, flexible, you control the schema. Cons: no enforced data model, dose-rotation fields don't carry visual feedback, charting is manual, mobile entry is friction-heavy. Most people who start with a spreadsheet are still using it at week 4. Most have abandoned it by week 8.
Habit-tracker apps
Apps like Streaks or Strides let you mark "took dose today." But they don't capture dose amount, route, site, or reconstitution math. Useful for adherence visualization, useless for protocol management.
Generic medication-tracker apps
Apps like Medisafe handle scheduled medications well but assume fixed-dose pre-measured pills. Peptide users dose calculate per-vial: a generic medication tracker can't know that "0.25 mg" of your semaglutide vial means a specific number of units on your syringe.
Why we built Peptra
The data model for peptide tracking has to handle: variable reconstitution, multi-route logging, anatomical site memory, cycle phase awareness, stack tracking, and marker correlation. None of the above tools handle all of this — they handle pieces. The result is people cobbling together a spreadsheet + a notes app + a calculator + their memory. Each piece works alone; the combination loses data integrity within weeks.