Annotation and callout detection
Find broken references, missing callouts, and orphaned annotations across your entire drawing set. Validate that every detail callout, section cut, and keynote actually points to the correct sheet and detail, eliminating one of the most common sources of RFIs.
Why annotation detection matters
Broken references are one of the top causes of RFIs during construction.
From PDF upload to annotation report
Helonic builds a reference graph and traces every link to its target.
Upload drawings
Drop your complete PDF drawing set into Helonic. We process every sheet to build a complete map of annotations and their targets.
Annotation extraction
AI identifies every callout bubble, section marker, detail reference, keynote, and specification callout across all sheets.
Reference validation
Each annotation is traced to its target, confirming the referenced sheet exists, the detail number is correct, and the content matches.
Error report
Receive a list of broken references, orphaned annotations, and mismatched callouts with exact locations on each sheet.
What we validate
Annotation checks across every reference type in the set.
Detail callout verification
Confirms every detail bubble points to an existing detail on the referenced sheet with the correct detail number.
Section reference checking
Validates that section cut markers reference actual section drawings and that the viewing direction is consistent.
Keynote validation
Ensures every keynote number on drawings corresponds to an entry in the keynote legend and vice versa.
Specification callout matching
Checks that specification section references (e.g., 09 21 16) on drawings match actual spec sections in the project manual.
Drawing note consistency
Identifies contradictory general notes between sheets and flags notes that reference non-existent specifications or standards.
Why this matters
Broken callouts are one of the top causes of RFIs in construction. When a detail bubble says "See Detail 3/A5.02" and sheet A5.02 only has details 1 and 2, the contractor stops work and submits an RFI. Multiply that across hundreds of callouts and the delays add up fast.
These reference errors are almost impossible to catch manually. They require someone to physically trace every callout to its destination across the entire set. Helonic builds a complete reference graph of your drawings and checks every link automatically, finding the broken connections that would otherwise become field problems.
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