Catch every change between drawing sets
Compare drawing revisions to identify what changed between versions. Helonic catches the unclouded modifications that humans miss and gives you the scope of every revision in minutes.
Why revision tracking matters
What changes typically slip between revisions, and what it costs when they reach the field.
From two versions to change report
Drop in the old and new sets. Helonic does the diff sheet by sheet.
Upload both versions
Upload your previous drawing set and the new revision. Helonic matches sheets automatically by number and title.
AI comparison
Our AI compares each sheet pair, identifying visual and textual differences across every element.
Change classification
Changes are sorted by type, dimensional, material, layout, notes, and administrative.
Difference report
Get a sheet-by-sheet breakdown of what changed, including the unclouded modifications that humans miss.
Types of changes detected
Both the changes that are clouded and the ones that aren't.
Clouded Changes
- Revision clouds and deltas
- Updated revision blocks
- New or modified details
- Changed dimensions within clouds
Unclouded Changes
- Modified dimensions without clouds
- Changed notes or keynotes
- Moved or deleted elements
- Material or finish changes
Layout Changes
- Wall relocations
- Door or window moves
- Equipment repositioning
- Room configuration changes
Administrative Changes
- New sheets added
- Sheets removed or superseded
- Title block updates
- Sheet renumbering
Where teams use it
The most common workflows where revision comparison pays for itself.
Bid to Award Comparison
- Compare the bid set against the contract set to identify scope changes before signing.
Milestone Reviews
- Track changes between 50%, 90%, and IFC sets to understand design evolution.
ASI / Bulletin Review
- See exactly what an ASI changes without manually flipping between versions.
Subcontractor Updates
- Show subs exactly what changed in the latest revision that affects their scope.
The unclouded change problem
Design teams are supposed to cloud all changes between revisions. In reality, changes slip through unclouded. A dimension changes, a note gets modified, a door swings the other way, and there is no cloud to flag it.
This is dangerous. Contractors price based on one set, then build from another. If they miss an unclouded change, it becomes a field problem, a claim, or at minimum, a heated conversation about who should have caught it.
Helonic catches what humans miss. Our AI compares every element on every sheet, identifying changes whether they are clouded or not. You know exactly what changed between versions.
Keep exploring
Related guides and features for teams managing drawing revisions.