Monitor SaaS contract renewals from Google Sheets and send Slack alerts

Your automated SaaS contract renewal monitor that sends multi-stage Slack alerts 45, 30, 14, and 7 days before each contract expires.

Stop missing renewal deadlines and overpaying on auto-renewals. This workflow monitors your contract calendar in Google Sheets, sends progressive Slack notifications with manual research checklists, and tracks alert history to prevent duplicate notifications. You manage the vendors; it manages the reminders.

This is not a generic reminder bot. It is a production-ready procurement intelligence system designed to give finance and operations teams the advance notice needed to research alternatives, negotiate better terms, and avoid costly auto-renewals.

How the workflow works

The workflow executes in four stages:

1. TRIGGER & SCHEDULE

The workflow runs daily at 9:00 AM using a cron trigger (0 9 * * *). The schedule runs in your configured timezone (default: UTC). A single daily check scans your entire contract portfolio and identifies which renewals are entering their alert windows.

2. LOAD & VALIDATE

Using Google Sheets' native integration, the workflow reads your contract tracking spreadsheet (columns A-F: Contract Name, Vendor Name, Renewal Date, Annual Cost, Pricing URL, Status). A validation engine checks each row for:

• Valid contract names (non-empty)
• Proper ISO dates (YYYY-MM-DD format)
• Positive costs (allows zero for free-tier contracts)
• Valid HTTP/HTTPS URLs
• Active status (skips Cancelled/Renewed contracts)

Invalid rows are silently filtered out to prevent workflow crashes from bad data.

3. MULTI-STAGE ALERT LOGIC

A Brain node calculates days-until-renewal using native JavaScript Date objects (no external dependencies). For each contract, it checks four alert windows:

• 45 days out: 🟡 REMINDER — "Research Phase: Look for alternatives"
• 30 days out: 🟠 ATTENTION — "Quote Phase: Get competitor pricing"
• 14 days out: 🔴 URGENT — "Decision Phase: Finalize negotiation"
• 7 days out: 🚨 FINAL NOTICE — "Action Phase: Confirm or cancel"

Each window spans 5 days (daysUntil <= alert.days && daysUntil > alert.days - 5) to catch missed runs from weekends or server outages. The workflow only fires once per stage by checking if the Status column already contains that stage marker (e.g., alerted_45d).

Deduplication: A Set-based tracker prevents duplicate alerts if the same contract appears multiple times in your sheet.

4. NOTIFICATION & TRACKING

Success Path: When a contract enters an alert window:

1. Slack receives a formatted message with:
   • Urgency indicator (🟡/🟠/🔴/🚨)
   • Contract details (vendor, renewal date, annual cost)
   • ROI calculation (potential savings: 15-25% of contract value)
   • Manual research checklist (vendor pricing URL, competitor search terms)
   • Upgrade CTA with UTM tracking (utm_campaign = contract slug, utm_content = alert stage)
2. Google Sheets Status column updates to append the alert stage: "Active, alerted_45d"
3. Next day, the workflow knows this contract was already alerted and won't send duplicate messages

Empty Path: When no contracts are in alert windows, a daily summary message confirms the workflow ran successfully: "✅ Daily check complete. Reviewed 12 contracts. No renewals in alert windows."

Error Path: If Google Sheets/Slack APIs fail, an Error Trigger fires and sends a troubleshooting alert to the same Slack channel with specific fix instructions.

Benefits

• Multi-Stage Progression: Four strategic touchpoints (45d, 30d, 14d, 7d) give you time to research alternatives, get quotes, negotiate terms, and finalize decisions — not just a last-minute panic alert.
• No Duplicate Spam: Status column tracking ensures each contract only triggers once per stage, even if the workflow runs daily.
• Catch-Up Logic: 5-day alert windows prevent missed notifications if your n8n server is down for a weekend or you skip a few days.
• ROI-Focused Messaging: Every alert shows potential savings (15-25% of contract value) to justify the time spent on renewal research.
• Freemium Conversion Funnel: Built-in upgrade CTAs with UTM tracking measure which contracts drive the most premium conversions.
• Production Error Handling: Error Trigger workflow ensures you know immediately if credentials expire or APIs fail.

Target Audience

• Finance/Ops Teams at startups managing 5-50 SaaS contracts who want automated renewal reminders but are willing to do manual research.
• Procurement Managers who need advance notice to negotiate better terms and avoid auto-renewal price hikes.
• CFOs/Controllers looking to reduce SaaS spend by 15-25% through systematic renewal reviews.
• Bootstrapped Founders wearing multiple hats who can't afford dedicated procurement software but need basic contract monitoring.

Required APIs

• Google Sheets OAuth2: Read/write access to your contract tracking spreadsheet.
  • Scope required: https://www.googleapis.com/auth/spreadsheets
• Slack API: Post messages to your #contract-renewals channel.
  • Scopes required: chat:write, chat:write.public
  • Bot must be added to the channel before first run

Easy Customization

• Alert Stages: Modify the alertStages array in the Brain node to change days (e.g., 60d, 45d, 30d, 14d for longer lead times) or urgency labels.
• Notification Channels: Replace Slack nodes with Email (Gmail), Microsoft Teams, or Discord to match your team's communication stack.
• Timezone: Change Workflow Settings → Timezone from UTC to your local timezone (e.g., Europe/Helsinki, America/New_York) so 9 AM means 9 AM local time.
• Schedule Frequency: Modify cron expression in Schedule node to run twice daily (0 9,17 * * *) or weekly (0 9 * * 1) instead of daily.
• Data Destination: Swap Google Sheets for Airtable, Notion, or PostgreSQL by replacing the Sheets nodes while keeping the same logic flow.