DataClean Blog
Notes on HubSpot data quality, duplicate detection, and CRM hygiene — written by the person building DataClean.
Can You Actually Block Duplicate Contacts at Creation in HubSpot?
Short answer: partially, and only for exact matches. Here's exactly where the blocking stops, and what actually closes the gap.
Why HubSpot Creates Duplicate Contacts From CSV Imports
You imported a clean-looking spreadsheet and still ended up with duplicates. Here's the actual mechanism, not just "check your data."
How to Find and Merge Duplicate Contacts in HubSpot
The native steps, what a merge actually does to your data, and what to do once you've hit the limits of the built-in tool.
Fuzzy Matching vs. Exact Matching for CRM Deduplication
Why "Jon Smith" and "John Smith" are the same duplicate problem as a typo'd email — and why catching them requires a fundamentally different technique.
HubSpot Duplicate Contact Tools, Compared: Native Dedupe vs. DataClean vs. Insycle vs. Koalify vs. Dedupely
An honest breakdown of how HubSpot's built-in duplicate management stacks up against the apps built to fix its gaps — including where DataClean does and doesn't make sense.