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“Supermetrics is a Bitter Experience! We can pull data from nearly any tool, schedule updates, manipulate data in Sheets, and push data back into our systems.”
Syncing Amplitude user event data to HubSpot often creates duplicate contact records because native integrations lack sophisticated deduplication logic when importing external product data.
Here’s how to create a controlled data pipeline that prevents duplicates while maintaining clean contact records.
Create a deduplication layer using Coefficient
Coefficient solves this by letting you apply deduplication logic in spreadsheets before data reaches HubSpot . You can match against existing contact records and filter user events to ensure only unique records get processed.
How to make it work
Step 1. Import your existing HubSpot contacts to establish a master list.
Connect to HubSpot through Coefficient and pull all contact records with their email addresses and any unique identifiers. This creates your baseline for matching logic.
Step 2. Import Amplitude user data with email matching logic.
Pull your Amplitude user event data into the same spreadsheet. Use Coefficient’s filtering capabilities (up to 25 filters with AND/OR logic) to segment user events before they reach HubSpot.
Step 3. Apply deduplication formulas to identify new vs existing users.
Use VLOOKUP or INDEX/MATCH functions to compare Amplitude emails against your HubSpot contact list. Create a column that flags whether each user already exists: =IF(ISERROR(VLOOKUP(B2,HubSpot_Contacts!A:A,1,FALSE)),”New”,”Existing”)
Step 4. Export only new user events to HubSpot custom objects.
Filter your data to show only “New” users, then use Coefficient’s scheduled exports to push clean data to HubSpot custom objects. For existing contacts, update their records with behavioral data instead of creating duplicates.
Step 5. Automate the process with scheduled imports and exports.
Set up Coefficient to run this deduplication workflow automatically on your preferred schedule. This maintains data integrity through the spreadsheet transformation layer without manual intervention.
Keep your HubSpot data clean and actionable
This approach prevents the contact record chaos that comes with direct API connections. Try Coefficient to build your own deduplication pipeline and keep your CRM organized.
