About
Why ProofGrit exists
Small construction materials testing labs do careful, essential work. Their software should be just as careful.
Who it is for
ProofGrit is for independent US testing labs with roughly one to twenty people: the field technician who casts cylinders before sunrise, the lab tech who breaks them on schedule, the reviewer who signs the report, and the manager who answers the phone when a client asks where it is.
Large firms have IT departments and custom systems. Small labs usually have a shared drive, a set of spreadsheets that have grown over the years, and a lot of retyping. We think that gap is worth closing.
What we are building
The foundation is a calculation library for concrete and soils testing, written in plain TypeScript and covered by tests that check each formula against worked examples. It powers the free calculators on this site, and it is the same code the rest of the product is built on.
Everything uses US customary units, and every result is rounded the way it is reported, with pass or fail decided on that reported value.