This workflow automates visual concept testing by batch-processing multiple images from Google Drive and testing them with Rally's AI persona network. It downloads images from a designated folder, uploads them to cloud storage for public access, then presents all options simultaneously to AI personas asking them to choose their preference with reasoning. The results are automatically tallied, ranked by popularity, and exported as a CSV file containing vote counts and percentages for each image option - perfect for A/B testing visual concepts, game themes, marketing assets, or any design decisions requiring audience validation.
Rally Multi-Image Testing

Automatically test multiple images against Rally's AI audience in a single workflow run. Upload images to Google Drive, get quantified preference results with reasoning, and export comprehensive vote analysis to CSV format.

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Overview
🎯 Pro Tips & Secret Sauce
The magic lies in the batch visual testing with intelligent vote aggregation:
- Automated Asset Pipeline - Seamlessly moves images from Google Drive through S3 storage to create the public URLs that Rally's API requires for visual analysis, eliminating manual file handling
- Simultaneous Choice Architecture - Presents all images together in a single voting session, mimicking real-world decision scenarios where users choose between multiple options rather than rating individually
- Smart Vote Correlation - Custom logic matches Rally's letter-based voting responses (a, b, c, d) back to original filenames, calculating both raw vote counts and percentage distributions
- Comprehensive Results Export - Generates detailed CSV reports with filename, option letter, vote count, and percentage - perfect for stakeholder presentations and decision documentation
- Scalable Testing Framework - Works with any number of images in the designated folder, automatically adjusting the voting options and result processing based on what's available
This creates a complete visual testing laboratory that can validate design concepts, game themes, marketing assets, or any visual decision with quantified audience data in minutes rather than weeks.
📝 Step-by-Step Instructions
- Manual Trigger - User initiates the workflow to begin batch testing of all images in the designated Google Drive folder
- Search Drive Folder - Automatically discovers all image files in the specified Google Drive folder ("images-rally-multi-n8n")
- Download Images - Sequentially downloads each image file from Google Drive to n8n for processing
- Upload to S3 - Uploads each image to AWS S3 bucket ("n8n-workflows") to create publicly accessible URLs required by Rally API
- Generate Public URLs - Creates properly formatted Cloudflare R2 CDN URLs for each uploaded image with URL encoding for special characters
- Aggregate Image Data - Combines all image filenames and their corresponding public URLs into a structured dataset for Rally testing
- Rally Multi-Image Test - Sends all images simultaneously to Rally's gaming audience personas asking "Which theme would you most like to play from the four choices below and why?" in voting mode
- Split Individual Votes - Processes Rally's response array to extract each persona's individual voting decision and reasoning
- Calculate Vote Results - Custom code tallies votes for each option (a, b, c, d), matches them back to original filenames, calculates percentages, and ranks by popularity
- Export CSV Report - Converts the final results into a downloadable CSV file containing option, filename, vote count, and percentage for comprehensive analysis and sharing
📋 Requirements
Required Integrations
- Google Drive - Source storage for images to be tested, with folder-based organization
- AWS S3 - Cloud storage for creating publicly accessible image URLs required by Rally API
- Rally API - AI persona testing service with multi-image voting capabilities and visual analysis
- Manual Trigger - On-demand execution for batch testing sessions
Required Credentials
- Google Drive OAuth2 credentials with read access to designated testing folders
- AWS S3 credentials with upload permissions to "n8n-workflows" bucket
- Rally API Bearer token with voting mode and file upload capabilities
Setup Prerequisites
- Google Drive folder containing images to test (default: "images-rally-multi-n8n" folder ID: 1YxT0C4emKscY6m0l9frquwCFe6ceL41y)
- AWS S3 bucket configured for public read access via Cloudflare R2 CDN
- Rally account with gaming audience persona access (default: re09d5f7de60e46)
- Images should be in common formats (PNG, JPG, JPEG) with descriptive filenames
About the Author

Mike Taylor
Mike Taylor is the CEO & Co-Founder of Rally. He previously co-founded a 50-person growth marketing agency called Ladder, created marketing & AI courses on LinkedIn, Vexpower, and Udemy taken by over 450,000 people, and published a book with O’Reilly on prompt engineering.