
Expiration Reminder
Procore
CertShield.app
Avetta
CrewTrackr
TrueLayer
YourStanding
SubDoc is COI tracking and vendor compliance software for contractors and property managers. Collect, verify, and track subcontractor Certificates of Insurance automatically, with AI OCR, expiration alerts, and no spreadsheets.

Mailflow.sh
Stackmail is a webmail service whereby you can log in to your emails from any browser at any time!

Which is more popular?
Website, pricing, platforms and company facts side by side.
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| Website | subdoc.io | stackmail.com |
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In their own words, as submitted to SaaSHub.


SubDoc is Certificate of Insurance (COI) tracking and vendor compliance software for general contractors, subcontractors, and property managers. It replaces spreadsheets and email chasing by collecting, verifying, and monitoring insurance documents in one place, so no subcontractor ever works...
No description of StackMail yet.
What each product offers, as listed by its team.


Possible disadvantages
An editorial look at what each product does well and who it suits.


Overall verdict
Why this product is good
Recommended for
Overall verdict
Why this product is good
Recommended for
How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing SubDoc and StackMail.
SubDoc's answer
SubDoc offers a self-service compliance platform with zero setup friction. Instead of forcing subcontractors to register accounts and create logins (the leading cause of collection delays), SubDoc sends a secure, passwordless magic link where vendors can upload certificates in seconds. It also features built-in AI-powered OCR that automatically scans uploaded documents to extract policy numbers, limits, dates, and endorsement compliance status (Additional Insured, Waiver of Subrogation) instantly.
SubDoc's answer
Traditional compliance tracking platforms (like TrustLayer, myCOI, or Certificial) are sales-led, expensive, and introduce high friction for vendors. Operations teams choose SubDoc because it is fully self-service, publishes flat and affordable pricing transparently, supports international multi-currency tracking out-of-the-box, and eliminates subcontractor login friction entirely.
SubDoc's answer
SubDoc's primary audience includes commercial general contractors, subcontractors, property managers, compliance administrators, and mid-market operations teams who need to track insurance certificates (COIs), W-9s, and licensing requirements across 5 to 500+ vendors without enterprise complexity or cost.
SubDoc's answer
Tracking contractor insurance compliance is notoriously painful. Teams are usually stuck between chaotic manual spreadsheets or bloated, expensive enterprise software. SubDoc was created to fill this gap: providing a simple, modern, self-service tracker that automates the chasing via magic links and uses smart AI extraction to speed up verification, giving operations teams their time back.
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When comparing SubDoc and StackMail, you can also consider the following products.

Expiration Reminder is a powerful solution that assists businesses by tracking the expiration dates for different things, including contracts, insurance, employee certifications, licenses, and more.
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A self-hosted, unified webmail client. Connect multiple IMAP/SMTP accounts and manage them all in one clean interface.
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Procore is the world's most widely used construction project management software. Easy to use, mobile platform with unlimited user licenses.
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AI-powered COI tracking for US property managers and contractors. Reads certificates of insurance, flags expired coverage and missing endorsements, and chases vendor renewals automatically. Human-reviewed. From $99/month.
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Avetta provides a cloud-based supply chain prequalification platform. Learn more at https://www.avetta.com/.
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Subcontractor compliance management for general contractors
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