Drop your plan set (PDF), scan free
or click to browse. We read the first sheets and flag likely corrections.
$49
Per check. No subscription necessary. Credit packs never expire.
City-by-city
Trained on the correction letters your jurisdiction actually sends, and honest about coverage.
Every finding
Sheet reference, code or checklist item, and a confidence level. Evidence, not vibes.
Run the city’s review before you file.
Upload your plan set
Drop in the PDF for one project. Plan Proof reads the drawings the way a plan checker would, sheet by sheet.
Get your likely corrections
Each finding carries a sheet reference, the code or checklist item it maps to, how often it shows up in real sets for your city, and a confidence level.
Fix them before you submit
Resolve the findings on your schedule, then file a cleaner set and skip the costly resubmittal loop.
Every finding arrives with its evidence.
Professionals act on evidence, not vibes. Here is what one finding looks like in your report.
Egress path exceeds allowable travel distance to exit discharge
The corridor route from Suite 210 measures roughly 265 feet to the nearest exit discharge, over the 250-foot limit for sprinklered B occupancies. This exact condition was flagged in 8 of the last 10 comparable sets we have seen from this jurisdiction.
Confidence
High
Seen in recent sets
8 / 10
Maps to
CBC 1017.2
Close the whole correction loop, not just the first pass.
When the agency’s letter comes back, Olumba captures it and checks your resubmittal against it. You send back a set that answers every item, and you always know whose court the ball is in.
Plan Proof and Backcheck are preliminary AI reviews. You confirm every item; they don’t replace your judgment or the city’s.
Plan Proof before you file
Likely corrections, fixed on your schedule
The city’s letter arrives
Paste or upload it. It becomes a tracked list, code refs intact
Backcheck before you resubmit
Flags anything not visibly addressed, before the city does
Your next set can go in cleaner.
Upload a plan set and see what your jurisdiction is likely to flag, with the evidence behind every finding.
Run your first check, $49