Palynth engine v0.1: a live provenance experiment, verifiable in your browser — see it work
The story · sample pair, real engine, drawn in your browser
Two issues of a room finish schedule. Both have four rows, the same header and the same page count, so every summary statistic says nothing changed. Below, each change is cropped from the two PDFs by your browser — not by us — with a box where the record says the value is, and the record that says it. Then point it at two documents of your own.
The same two files check on /verify with nothing of ours. What no frame can show is why a value changed; that is a sentence a person writes, and the record has a field for it. These are the comparison’s own drafts, so that field is the machine’s.
Sample pair · synthetic, baked into this page
101 → 101A
A schedule row carries no size, location or hardware to corroborate this. Confirm it on the drawing before pricing.
CPT-1 → CPT-2
PT-1 → PT-2
TOILET → RESTROOM
JANITOR · SEALED · RB-1 · PT-1
CORRIDOR · VCT-1 · RB-1 · PT-1
What this does not show
Schedules only. A wall moved on a plan, a door added in the drawing rather than the schedule, is not seen. A rename is believed on the number and the row position, which is thin; the frames make it easy to look and disagree. The sample is a synthetic pair built to defeat the lazy answer; the engine that draws your own project is the one running on the hosted service. See the demo for a history across five revisions.