Census vs Clay

Census is a reverse ETL and data activation platform founded in San Francisco in 2018 and acquired by Fivetran in 2025. It syncs modeled data from cloud warehouses such as Snowflake, BigQuery, Databricks and Redshift into the business tools teams use every day, including Salesforce, HubSpot, Braze, Marketo and ad platforms, so that sales, marketing and support act on the same numbers as the data team.

Beyond plain syncs, Census offers Audience Hub, a visual segment builder for marketers, entity resolution to unify customer identities in the warehouse, observability with alerts and sync history, and tight dbt integration so models can be synced directly. More than 200 destinations are supported. Pricing now follows the Fivetran model: a free plan includes 3,500 monthly active rows for activations, while Standard, Enterprise and Business Critical plans are usage-based and billed on monthly active rows, so cost grows with the volume of data synced.

Census suits companies that already have a warehouse and a data team and want to activate that data without building custom pipelines. It is of little use without a warehouse, and since joining Fivetran its roadmap is increasingly tied to Fivetran's platform. Hightouch is the closest competitor and has expanded further into a composable CDP, while Segment and RudderStack combine event collection with activation.

Clay is a go-to-market data platform from a New York company that works like a spreadsheet for prospecting and enrichment. You import or source lists of companies and people, and each column can call an external data provider, an AI agent or a formula, so a row fills itself with firmographics, contact details, technology data and custom research.

Its best-known feature is waterfall enrichment: Clay queries more than 100 providers in sequence until one returns, for example, a verified email, and you spend credits only on results. Claygent is an AI research agent that visits websites and answers custom questions, such as whether a company sells to enterprises or has a free trial. Signals track job changes, hiring and funding, and results sync to CRMs such as HubSpot and Salesforce and to sequencing tools. Plans are tiered by monthly credits, starting with a limited free plan, and credit consumption is the main cost driver.

Clay fits revenue operations teams, outbound sales teams and agencies that work at volume and can invest time in building tables. The learning curve is real, poorly designed tables burn credits, and for a simple lead list it is overkill. Apollo combines a contact database with sequencing in a simpler package, ZoomInfo is the enterprise data incumbent, and Cognism is strong for European contact data. An ecosystem of Clay agencies and consultants has grown around the product because setup skill matters so much.