PDFs are processed in memory and never written to disk or stored on our servers. Anthropic's API has a zero-retention policy and does not use your data for training. No Callout employee can view your drawings. Read our full privacy policy →
Exact code citations
Every comment references the specific section, subsection, and edition. No vague references, no hallucinated sections.
Calibrates to your style
Callout improves with use. The more you review, the more accurately it matches your engineering judgment.
Firm Standards Library
Add your own firm-specific requirements like duct leakage testing protocols, equipment access clearances, and house standards. Callout checks for them on every review automatically.
Full review history
Every past review stored and searchable by project, sheet, discipline, or severity. Export to Excel for QA/QC tracking or client deliverables.
All disciplines, one pass
Mechanical, Structural, Architectural, Electrical, Plumbing, Energy, and Fire & Life Safety. Review multi-trade sets against all applicable codes simultaneously.
Pay per use
No seat licenses, no monthly minimums. Pay only for what you review. A fraction of what manual review costs. Scale up or down as your workload changes.
How findings are classified
Every finding comes with a severity level and confidence rating.
Severity tells you what to fix first. Confidence tells you how sure the AI is about the finding, so you know where to trust it and where to double-check.
Severity Levels
Critical
Safety hazard or permit blocker. Must be resolved before submission.
Major
Code violation requiring a design revision. Will likely be flagged by the AHJ.
Minor
Technical issue or documentation gap. Should be corrected but won't block a permit.
Advisory
Best practice recommendation or coordination note. Not a code violation.
Confidence Ratings
High
The AI identified a clear code violation with a specific section reference. These findings are reliable and rarely need correction.
Medium
The AI found a likely issue but the interpretation may depend on project-specific context. Worth verifying against your drawings.
Low
The AI flagged a potential concern based on limited information. Treat as a suggestion. Review carefully before acting on it.
AI calibration improves accuracy. Callout improves with use. The more you review, the more it matches your engineering judgment.
Disciplines
Multi-discipline drawing review in a single pass.
Callout reviews across all major AEC disciplines so you can run multi-trade sets in a single pass.
Every firm has standards that go beyond what model codes require: minimum equipment access clearances, duct leakage testing protocols, preferred control sequences, commissioning requirements. Callout's Firm Standards Library lets you codify these once and enforce them on every review.
Add up to 20 firm-specific standards in plain English
Toggle standards on/off per review without deleting them
AI checks your standards alongside selected codes every time
Standards sync across devices via your account
Example Firm Standards
Equipment access clearance
Minimum 36" clearance on service side of all HVAC equipment, 24" on non-service sides.
Duct leakage testing
All supply and return ductwork must be tested to SMACNA Leakage Class 6 or tighter.
Thermostat placement
Thermostats to be located 48" AFF, away from exterior walls, windows, and supply diffusers.
These standards are checked on every review alongside your selected codes.
Pricing
Drawing review pricing. Pay per sheet.
Credits never expire. No seat licenses. Every pack includes the full feature set. Scale up on busy seasons, pay nothing when you don't.
Senior drawing review costs $150-$250 per hour, at 0.5-1.0 hours per sheet. Callout does the first pass in under a minute, catching the obvious issues so your PE can focus on the ones that actually need engineering judgment.
Built by a licensed Mechanical PE
FAQ
AI drawing review FAQ.
Does this replace a PE review?
No. Callout is an AI-assisted first-pass tool. All findings must be verified by a licensed PE before use in construction documents. It catches the obvious issues so your PE can focus on the ones that need engineering judgment.
What file types are supported?
PDF only. Multi-sheet drawing sets, single sheets, and multi-file uploads all work. Maximum 100 MB and 50 sheets per review session.
Do credits expire?
Never. Buy credits when you have a busy project load and use them whenever you need them. No time limits, no monthly minimums.
What jurisdictions does Callout cover?
Callout checks against 33+ model codes and national standards including IMC 2024/2021, IBC 2024/2021, IPC 2024/2021, IECC 2024/2021, ASHRAE standards, NFPA 13 2022, NFPA 72 2022, NFPA 101, ASCE 7, ACI 318, AISC 360, the NEC, and more. These model codes apply across most US jurisdictions. Callout does not check local amendments or state-specific modifications.
What is the Firm Standards Library?
It lets you add your own firm-specific requirements -- minimum equipment access clearances, duct leakage testing protocols, house schedule standards. Callout checks for these automatically on every review alongside the selected codes.
Is my drawing data secure?
Your PDFs are processed in memory and never stored on Callout's servers. Anthropic's API has a zero-retention policy and does not use your data for model training. Read about our security practices →