Vattrace is an offline calibration and maintenance ledger for resin-printing users who need profiles to stay tied to real conditions. Build a private profile lineage for every printer, resin, layer height, temperature, calibration coupon, vat, and outcome. KEY FEATURES - Printer, resin, lot, color, and layer profile matrix - Exposure-ladder comparison history - Layer-count and core-time estimator - Vat film and screen service timeline - Failure evidence and controlled-change notes - PDF profile and maintenance brief - Optional local photos through Apple's Photos picker - Local PDF project brief - 230 original offline reference plates - No account, ads, analytics, tracking, subscription, or network requirement Vattrace records user-entered printer settings and estimates. It does not slice files, control printers, certify materials, assess ventilation or chemical exposure, or replace resin safety data, manufacturer instructions, PPE, and responsible handling.