How it works
Catch your corrections before the city does
Plan Proof reads your plan set and predicts the corrections your jurisdiction is likely to flag — with the evidence behind each one, so you fix them before you submit.
1 · Scan the drawings
Upload your plan set and Plan Proof reads the actual sheets, flagging likely corrections before the agency ever sees them.
2 · Bring in the agency letter
When corrections come back, paste or upload the letter. Olumba turns it into a clean, trackable list — no retyping.
3 · Backcheck the resubmittal
Upload the corrected set and Backcheck re-reads it against each correction, suggesting whether it looks addressed, not addressed, or can't be verified.
4 · Confirm & respond
You confirm each verdict — nothing resolves on its own — then download the response sheet and hand it back to the agency.
Each scan or backcheck uses 1 credit. Plan Proof is a preliminary AI review — never an official determination. You confirm every item.
See it on your own plans
Upload a plan set and get your likely corrections. $49 per check, no subscription necessary.