Generate and vet ad creative with OpenAI, Spendict, Google Sheets, and Slack

by Spendict ✓ · 9 views · created 2026-07-13 · Content Creation, AI Summarization

What this workflow does

This workflow has 15 nodes and runs when someone submits an n8n form (“Generate + gate ad variants”). Along the way it connects Google Sheets. It also calls api.openai.com, spendict.com and hooks.slack.com over HTTP.

How it runs

Trigger: When someone submits an n8n form (“Generate + gate ad variants”).

1. OpenAI: generate variants (HTTP Request): calls api.openai.com (POST)
2. Split into variants (Code): runs custom JavaScript code
3. Spendict: assess_ad_creative (HTTP Request): calls spendict.com (POST)
4. Gate on verdict (Switch): routes items into 2 branches
5. Row: approved (Code): runs custom JavaScript code
6. OpenAI: rewrite with fixes (HTTP Request): calls api.openai.com (POST)
7. Killed ads (logged) (Aggregate): combines items into one
8. Collect winners (Merge): merges the data from its input branches
9. Parse rewritten ad (Code): runs custom JavaScript code
10. Google Sheets: append

…plus 4 more steps. See the full node list below.

Services it uses

Google Sheets

HTTP calls to: api.openai.com, spendict.com, hooks.slack.com

Before you upgrade to n8n 3.0

Nodes used (7)

• n8n Form Triggern8n-nodes-base.formTrigger
• HTTP Requestn8n-nodes-base.httpRequest
• Coden8n-nodes-base.code
• Switchn8n-nodes-base.switch
• Mergen8n-nodes-base.merge
• Google Sheetsn8n-nodes-base.googleSheets
• Aggregaten8n-nodes-base.aggregate

From the author

Quick overview This workflow collects a product brief via an n8n form, uses OpenAI to generate ad variants, gates each one with Spendict run/fix/kill scoring, auto-rewrites fixable ads, logs approved results to Google Sheets, and posts an approval count to…

View the original on n8n.io → Check your own copy