n8n SOP Review Reminder Digest: Google Sheets + Gmail

Automate SOP review reminders—Google Sheets + Gmail in one HTML digest

Need an automated way to keep SOPs reviewed and compliant? This n8n workflow checks your Google Sheets SOP register for procedures due (or overdue), groups reminders by owner, and sends a single HTML email digest per owner via Gmail—while recording reminder history back into your register.

What this workflow does

• Runs on a schedule (or manually for a demo run) to load configuration like the review window, cooldown rules, and register location.
• Reads SOP rows from either a built-in demo dataset or your Google Sheets SOP register.
• Validates active SOP entries, then identifies SOPs that are due or overdue within your configured window.
• Prevents duplicate reminders using a cooldown mechanism: reminders are suppressed when the same due date and version were already reminded.
• Creates an HTML digest per owner by grouping due items using owner_email, so each owner receives one email with all relevant procedures.
• Generates an HTML planning report and a preview file so you can review planned recipients and messages before sending.
• Sends reminders via Gmail (when enabled) and writes reminder history back to Google Sheets only after Gmail returns a successful message ID.

Use cases

• SaaS and operations teams that must ensure SOP reviews occur on time across multiple owners.
• Automation engineers who want an auditable SOP reminder process with validation, cooldown, and history tracking.
• Organizations using Google Sheets as an SOP register and Gmail for owner notifications.

Technical details

• Google Sheets integration for SOP register read/write (including fields like sop_id, next_review_date, last_reminded_on, last_reminded_due_date, last_reminded_version).
• Gmail integration to send one HTML digest per owner when sending is enabled.
• Workflow logic uses n8n nodes such as if, code, and no op, plus a sticky note for run clarity.

Ideal if you’re looking for an n8n SOP review reminder digest workflow with Google Sheets + Gmail, scheduling, cooldown suppression, and an HTML planning preview.